Patent Publication Number: US-2022210970-A1

Title: Work Vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the United States national phase of International Application No. PCT/JP2020/016493 filed Apr. 15, 2020, and claims priority to Japanese Patent Application Nos. 2019-119004 filed Jun. 26, 2019, and 2019-119005 filed Jun. 26, 2019 the disclosures of which are hereby incorporated by reference in their entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a work vehicle configured to determine quality of harvested pasture grass while traveling. 
     Description of Related Art 
     Pasture grass are employed as forage for livestock. Pasture grass employed as such forage are stored in e.g., a silo after their mowing in a pasture land or sun-dried firstly in the pasture land and then formed into a cylindrical roll bale and collected as such, Pasture grass are generally subjected to butyric acid fermentation for their nutritional improvement. In butyric acid fermentation, mold may be generated if the water content is too high. Further, in order to allow the fermentation to proceed appropriately, there arises a need to add an additive such as formic acid or the like. Thus, for allowing appropriate butyric acid fermentation, management of the water content of pasture grass is important. As disclosed in Patent Document 1, for determination of water content of pasture grass, it has been conventionally practiced to determine the water content of pasture grass using e.g. a water content determination device on pasture grass left in the pasture land immediately after their harvest or pasture grass collected in the pasture land after their harvest. Such water content determination device determines water content by irradiating light onto the pasture grass and then effecting a spectroscopic analysis of reflected light. 
     Patent Document 1: Japanese Unexamined Patent Application Publication No 2018-185594. 
     SUMMARY OF THE INVENTION 
     However, pasture grass left or collected in a pasture land are present in a sparse state with gaps present between the pasture grass. For this reason, when light is irradiated onto the pasture grass, there occurs diffused reflection, which prevents the water content determination device from receiving the light passed through the pasture grass appropriately. As a result, appropriate water content determination may sometimes become impossible. This problem is not limited to water content determination, but occurs also with other determination devices determining various qualities. 
     For solving the above-described problem, the object of the present invention is to determine quality of pasture grass with high accuracy. 
     For accomplishing the above-noted object, a work vehicle relating to one embodiment of the present invention comprises a work vehicle configured to carry out work travel in a pasture land where harvested pasture grass are left, the work vehicle comprising a quality determination device configured to determine quality of pasture grass in a course of the work travel;
         wherein the quality determination device includes:
           a cylindrical grass sending tube;   a grass taking section configured to feed at least a portion of the pasture grass left in the pasture land to an inside of the grass sending tube via a first end of the grass sending tube; and   a quality determination instrument configured to determine quality of the pasture grass compressed inside the grass sending tube.   
               

     Harvested pasture grass will be left over in the pasture land under a natural state without application thereto of any special pressure except for the gravity. For this reason, the pasture grass will be deposited in a sparse state, with the pasture grass being present having gaps therebetween. If quality determination is attempted on such pasture grass by irradiation of e.g. light thereon, diffused reflection may occur in the detection media such as light or the like (to be referred to simply as “light or the like” hereinafter), thus disabling appropriate quality determination. 
     With the above-described arrangement, in association with traveling of the work vehicle, the grass taking section takes in the pasture grass in the pasture land and packs them into the grass sending pipe (the grass sending tube). With this, the pasture grass present in a sparse state will be gradually compressed inside the grass sending pipe. As a result, the quality determination instrument can carry out quality determination with irradiation of light to the pasture grass having reduced gaps, so that the quality of the pasture grass can be determined with high accuracy with effective suppression of diffused reflection of the light or the like. 
     Further, there sometimes exists unevenness of quality in the left pasture grass between the upper layer part and the lower layer part of the pasture land. With the above-described inventive arrangement, the pasture grass are stirred and mixed when being taken in by the grass taking section. As a result, the pasture grass having varied qualities will be fed in a mixed state to the quality determination instrument, so that determination of average quality of pasture grass left in the pasture land becomes possible. 
     A work vehicle relating to one embodiment of the present invention includes a work vehicle including a harvesting section and configured to carry out harvesting travel in a pasture land, and a quality determination device configured to determine quality of pasture grass while carrying out work travel;
         wherein the quality determination device includes:
           a cylindrical grass sending tube;   a grass taking section configured to feed at least a portion of pasture grass harvested by the harvesting section to an inside of the grass sending tube via a first end of the grass sending tube; and   a quality determination instrument configured to determine quality of the portion of the pasture grass compressed inside the grass sending tube.   
               

     With the above-described arrangement, in association with traveling of the work vehicle, the grass taking section takes in the pasture grass harvested by the harvesting section and feeds and packs them into the grass sending tube. With this, the pasture grass present in a sparse state will be gradually compressed inside the grass sending tube. As a result, the quality determination instrument can carry out quality determination with irradiation of light to the pasture grass having reduced gaps, so that the quality of the pasture grass can be determined with high accuracy with effective suppression of diffused reflection of the light or the like. 
     Further, preferably, the portion of the pasture grass sent into the grass sending tube are discharged via the other end (a second end) of the grass sending tube to be merged with a portion of the pasture grass which was not sent into the grass sending tube. 
     With the above arrangement, as the pasture grass used in the quality determination are returned to the pasture grass which were not used for the determination, the pasture grass can be used without waste. 
     Further preferably, the work vehicle further comprises a conveying path for collecting and conveying the pasture grass, wherein one end (first end) and the other end (second end) of the grass sending tube are connected to the conveying path, and the grass sending tube bypasses the conveying path. 
     As examples of work vehicle, there are a harvester configured to collect pasture grass in a pasture land and stack them on a loader wagon, a truck, etc., and a roll baler configured to collect pasture grass in a pasture land and to form them into a roll bale. Such work vehicles have a conveying path for conveying collected pasture grass. The quality determination device can be mounted on these work vehicles also, and the quality determination device can be incorporated in the conveying path included in the work vehicles. If the quality determination device is included in the conveying path, quality determination can be carried out on each batch of collected pasture grass. Further, as the quality determination of pasture grass can be carried out in the course or a work, if the quality is found inappropriate, it is possible to take such measure as adding an additive to the pasture grass or suspending the work. As a result, improvement of work efficiency is made possible. 
     Further, preferably, the grass taking section is configured to adjust an amount of pasture grass to be sent into the grass sending tube in proportion with a traveling speed of the work vehicle. 
     With the above-described arrangement, an appropriate amount of pasture grass are sent into the grass sending tube at an appropriate speed, so that the pasture grass can be compressed in an efficient manner. 
     Further, preferably, the grass sending tube has a sectional area that is progressively decreased in at least a part of a section from the first end of the grass sending tube to an area where the quality determination device is disposed. 
     By progressively decreasing the cross sectional area of the grass sending tube toward the quality determination device, the pasture grass can be compressed in an efficient manner. Thus, diffused reflection of the light or the like can be suppressed easily, and the quality of pasture grass can be determined with high accuracy. 
     A work vehicle relating to one embodiment of the present invention comprises a work vehicle configured to carry out work travel in a pasture land, the work vehicle comprising a quality determination device configured to determine quality of pasture grass while carrying out the work travel;
         wherein the quality determination device includes:
           a grass pressing device for pressing the pasture grass;   a quality determination instrument configured to determine the quality of the pasture grass pressed by the grass pressing device; and   a supporting portion configured to support the grass pressing device vertically movably relative to the work vehicle.   
               

     Harvested pasture grass will be left in the pasture land under a natural state without application thereto of any special pressure except for the gravity. For this reason, the pasture grass will be deposited in a sparse state, with the pasture grass being present with gaps therebetween. If quality determination is attempted on such pasture grass by irradiation of e.g. light thereon, diffused reflection may occur in the detection media such as light or the like (to be referred to simply as “light or the like” hereinafter), thus disabling appropriate quality determination. 
     With the above-described arrangement, in association with traveling of the work vehicle, the grass pressing device presses the pasture grass to reduce the gaps therebetween, so the quality determination device can carry out the quality determination of the pasture grass under a dense state thereof. Further, since the grass pressing device is supported vertically movably, the grass pressing device can move up and down in response to repulsive force from the pasture grass. Therefore, there will not occur such inconvenience of the grass pressing device getting hooked with the grass to push out the pasture grass forwardly. Thus, the pasture grass can be pressed in an appropriate manner. For the reasons mentioned above, the work vehicle can determine the quality of pasture grass with high accuracy, with effective suppression of diffused reflection of the light or the like. 
     Further, preferably, the grass pressing device includes an elastic body configured to press down the grass pressing device. 
     With the above-described arrangement, as the grass pressing device can press the pasture grass more effectively by the elastic force of the elastic body, the diffused reflection of the light or the like can be suppressed to allow high accuracy determination of the quality of pasture grass. 
     Preferably, the supporting portion is vertically pivotally supported by a machine body of the vehicle. 
     With the above-described arrangement, even if the pasture grass are left under an undulated state, as the grass pressing device follows the undulation thanks to the vertically pivotable supporting portion, the pasture grass can be pressed in a more appropriate manner, whereby the diffused reflection of the light or the like can be suppressed to allow high accuracy quality determination of the pasture grass. 
     Preferably, the grass pressing device has an opening at which the quality determination instrument is provided. 
     If the quality determination device were provided in the face of the grass pressing device which presses the pasture grass, unevenness would be formed in this face of the grass pressing device which presses the pasture grass, which makes it impossible to press the grass in an efficient manner. With the above-described arrangement, the quality determination instrument can be provided in the reverse face of the grass pressing device relative to its grass pressing face. Therefore, the pasture grass can be pressed by the entire grass pressing face of the grass pressing device. As a result, the pasture grass can be pressed in an efficient manner. 
     Preferably:
         the quality determination device is mounted on and supported by the grass pressing device to determine the quality of the pasture grass through the opening; and   the grass pressing device protrudes from the quality determination instrument on an outer circumferential side.       

     The quality determination instrument may suffer from determination accuracy reduction due to influence from light incident from the outside. With the above-described arrangement, as the quality determination instrument is provided in the reverse face of the grass pressing face of the grass pressing device, the light can be irradiated onto the compressed pasture grass through the opening. Simultaneously, the grass pressing device can block light incident on the quality determination instrument from the outside. For the reasons mentioned above, even higher quality determination of pasture grass is made possible. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating a configuration of a pasture grass water content determination device, 
         FIG. 2  is a side view illustrating a condition or form of pasture grass at the time of water content determination, 
         FIG. 3  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, 
         FIG. 4  is a view for explaining relationship between density of pasture grass and traveling of light, 
         FIG. 5  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, 
         FIG. 6  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, 
         FIG. 7  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, 
         FIG. 8  is a view illustrating a form of the pasture grass water content determination device to be mounted on a conveying device, 
         FIG. 9  is a perspective view illustrating an arrangement of the pasture grass water content determination device, 
         FIG. 10  is a section view illustrating a mounting arrangement of the pasture grass water content determination device, 
         FIG. 11  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, 
         FIG. 12  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted, and 
         FIG. 13  is a view illustrating a work vehicle on which the pasture grass water content determination device is mounted. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Embodiment 1 
     [Pasture Grass Water Content Determination Device] 
     Firstly, an example of arrangement of a pasture grass water content determination device (corresponding to a “quality determination device”) to be mounted on a work vehicle relating to this embodiment will be explained. 
     A pasture grass water content determination device  20  is configured to take in harvested or reaped pasture grass  1  and compress them and then to determine the water content of the pasture grass  1  under their compressed state. This pasture grass water content determination device  20  is mounted on a work vehicle which travels in a pasture land and determines the water content of the pasture grass  1  while moving in association of traveling of the work vehicle. The pasture grass water content determination device  20  includes a spectroscopy analyzer (corresponding to a “quality determination instrument”)  9 , a grass sending tube  21  and a raking-in section (corresponding to a “grass taking section”)  22 . 
     The grass sending tube  21  comprises a tubular structure including two side walls  21   a , a bottom portion  21   b  and a top plate portion  21   c . For instance, all of the side walls  21   a , the bottom portion  21   b  and the top plate portion  21   c  are plate-like members. Each one of the two side walls  21   a  is disposed erect at the opposed ends of the bottom portion  21   b  and face each other. The top plate portion  21   c , in the area forwardly of the grass sending tube  21 , extends across and between the two side walls  21   a  and faces the bottom portion  21   b . Here, the front end portion of the grass sending tube  21  corresponds to the inlet of the grass sending tube  21  via which the pasture grass  1  are taken in. 
     The raking-in section  22  is supported to be pivotable about an axis P extending between the two side walls  21   a , with the raking-in section  22  extending across and between the two side walls  21   a  in the area forwardly of the grass sending tube  21 . The raking-in section  22  includes a cylinder  22   a  and blades  22   b . The cylinder  22   a  is a cylindrical member rotatable about the axis P. The blades  22   b  protrude from the cylinder  22   a  and are provided in a plurality on the surface of the cylinder  22   a  in juxtaposition in the rotational direction. In operation, as the blades  22   b  are rotated about the axis P in association with rotation of the cylinder  22   a , the pasture grass  1  are raked in to be packed inside the grass sending tube  21 . For instance, four such blades  22   b  will be provided on the cylinder  22   a . Further, preferably, each blade  22   b  has a plurality of pawls  22   c  at its leading end. With provision of such pawls  22   c , the blades  22   b  can rake in the pasture grass  1  in an efficient manner. Further alternatively, each blade  22   b  may be bent in the rotational direction at its leading end area. With this arrangement too, the blades  22   b  can rake in the pasture grass  1  in an efficient manner. 
     The raking-in section  22  rakes in at least some of the pasture grass  1  and packs them one after another to the inside of the grass sending tube  21  via its inlet. Thus, the pasture grass  1  inside the grass sending tube  21  are compressed to obtain a higher density. The pasture grass  1  which have passed through the inside of the grass sending tube  21  are discharged via a discharging output which is the rear end of the grass sending tube  21 . The discharged pasture grass  1  are merged with pasture grass  1  which were not raked in. 
     The spectroscopy analyzer  9  is disposed across and between the two side walls  21   a  in the upper area of the grass sending tube  21 . For instance, the spectroscopy analyzer  9  will be disposed rearwardly of the top plate portion  21   c  and placed in contact with this top plate portion  21   c . The spectroscopy analyzer  9  is disposed toward a determination head  8  inside the grass sending tube  21  between the two side walls  21   a  to face the pasture grass  1  compressed inside the grass sending tube  21 . With these arrangements, the spectroscopy analyzer  9  can determine a water content of the pasture grass  1  which were compressed inside the grass sending tube  21 . The spectroscopy analyzer  9  irradiates a light  7  (see  FIG. 4 ) such as near infrared beam from the determination head  8  and receives the light which passed through the pasture grass  1  and returned after repeated reflections. Then, the spectroscopy analyzer  9  analyzes the received light  7  (see  FIG. 4 ) to determine the water content of the pasture grass  1 . 
     With the above-described arrangements, the spectroscopy analyzer  9  can irradiate the light  7  (see  FIG. 7 ) onto the pasture grass  1  which have been sufficiently compressed inside the grass sending tube  21 , so that as will be described later with reference to  FIG. 4 , diffused reflection of the irradiated light  7  (see  FIG. 4 ) by the pasture grass  1  is suppressed. As a result, the spectroscopy analyzer  9  can determine the water content of the pasture grass  1  with accuracy by appropriately receiving the light (see  FIG. 4 ) which passed through the pasture grass  1 . 
     Further, since the grass sending tube  21  has an annular structure, light is shielded at least in the vicinity of the spectroscopy analyzer  9  inside the grass sending tube  21  and incidence of light from the outside to the pasture grass  1  packed inside the grass sending tube  21  is suppressed. For this reason too, the spectroscopy analyzer  9  can determine the water content of the pasture grass  1  with high accuracy by receiving only the light (see  FIG. 4 ) which passed through the pasture grass  1 . 
     Moreover, in the left pasture grass  1 , due to e.g. difference of drying speeds, unevenness of their water contents may occur therein between the upper layer area and the lower layer area of the pasture land. With use of a pasture grass water content determination device  20 , the pasture grass  1  are stirred and mixed together when they are raked in by the raking-in section  22 . As a result, the pasture grass  1  having uneven water contents are fed in a mixed state to the spectroscopy analyzer  9 , so that the spectroscopy analyzer  9  can determine an average water content of the pasture grass  1  left in the pasture land. 
     [Work Vehicle] 
     A work vehicle relating to this embodiment mounts the pasture grass water content determination device  20  described above. Next, with reference to  FIG. 3  in combination with  FIG. 2 , modes of using the pasture grass water content determination device  20  by the work vehicle relating to this embodiment will be explained. The following explanation is explanation using a tractor T as the work vehicle. 
     The pasture grass water content determination device  20  is mounted on the tractor T, with a supporting portion  13  being connected to a machine body front end (e.g. the front end of the machine body frame) of the tractor T. 
     The pasture grass water content determination device  20  may be used in the case of the tractor T traveling forwardly or in the case of the tractor T traveling reversely. Yet, under its in-use state, the pasture grass water content determination device  20  will be mounted in such a manner that the inlet of the grass sending tube  21  is oriented to the front side in the advancing direction of the tractor T. Namely, the pasture grass water content determination device  20  is mounted such that the raking-in section  22  is positioned forwardly of the spectroscopy analyzer  9 , relative to the front side of the advancing direction of the tractor T. 
     Here, pasture grass  1  grown in a pasture land are reaped and sun-dried (dried) in the pasture land, if needed. Sometimes, for readiness of collecting the pasture grass  1 , the pasture grass  1  may be left in the pasture land when appropriate and laid in the form of ridge. A tractor T will travel on such pasture grass  1  reaped in the pasture land and the raking-in section  22  will rake in the pasture grass  1  in association with traveling of the tractor T and the pasture grass  1  will be compressed inside the grass sending tube  21 . And, the spectroscopy analyzer  9  determines the water content of the pasture grass  1  under the compressed state. 
     [Determination of Water Content] 
     Next, with reference to  FIG. 4 , there will be explained traveling of the light  7  irradiated at the time of determination of the water content and accuracy of the determination. 
     As described above, the reaped grass  1  are left in the pasture land when necessary and then the pasture grass  1  will be left as they are after being reaped or collected in the form of ridge for facilitating subsequent work. In either case, the pasture grass  1  in a pasture land are present under a natural state without being subjected to any special compression and exist in a sparse state with gaps present therebetween 
     In this way, if the light  7  is irradiated from the spectroscopy analyzer  9  onto the pasture grass  1  which are under such sparse state, the light  7  will be reflected by the pasture grass  1  due to the spaces present between the pasture grass  1 . If diffused reflection of the irradiated light  7  occurs as described above, the light will be scattered in an uncontrolled manner, so the light  7  may fail to return to the determination head  8  of the spectroscopy analyzer  9 . In this case, determination of the water content of the pasture grass  1  becomes impossible. As a result, relative to the irradiated light  7 , the ratio of the light  7  returning to the determination head  8  becomes smaller, making accurate determination of the water content of the pasture grass  1  impossible. 
     On the other hand, if the light  7  is irradiated from the spectroscopy analyzer  9  onto the pasture grass  1  which are under a dense state, the light  7  passed through a certain pasture grass  1  will reach next pasture grass  1  immediately, so diffused reflection occurs less likely. Thus, the light which has passed through some pasture grass  1  will not diffuse and will readily return to the determination head  8 . As a result, there is high likelihood of a sufficient amount of light  7  returning to the determination head  8  after passage through the pasture grass  1 , so that accurate determination of water content of the pasture grass  1  is made possible. 
     And, since such accurate determination of water content of the pasture grass  1  is made possible, it becomes possible to make a work plan at a timing optimal for carrying out a next work or to take such an action as adding an additive, etc. Further, if a communication device (not shown) is provided additionally for transmitting the determined water content to a server or the like for managing a silo, etc., it will become possible to manage the silo or the like in accordance with the water content of the pasture grass  1  stored therein. For the reasons mentioned above, high quality forage can be produced easily. Moreover, since the water content determination is possible while traveling in the pasture land in a scanning manner, if position information of the pasture land can be obtained by means of e.g. GPS or the like, the position information and the water content can be correlated with each other to generate the distribution of water content in the pasture land in the form of a map also. 
     As shown in  FIG. 1 ,  FIG. 2  and  FIG. 4 , the pasture grass water content determination device  20  relating to this embodiment allows the spectroscopy analyzer  9  to irradiate the light  7  onto the pasture grass  1  under a dense state by pushing the pasture grass  1  into the grass sending tube  21  for their compression therein. Therefore, the water content of the pasture grass  1  can be determined accurately. 
     Here, since the spectroscopy analyzer  9  determines the water content of the pasture grass  1  with use of the light  7 , accurate determination of the water content becomes impossible if light incident from the outside other than the light  7  irradiated by the spectroscopy analyzer  9  enters the determination head  8 . 
     Then, in the pasture grass water content determination device  20  relating to this embodiment, as described above, the spectroscopy analyzer  9  is installed in such a manner to cover the area upwardly of the grass sending tube  21 . Therefore, the determination head  8  of the spectroscopy analyzer  9  can irradiate the light  7  onto the pasture grass  1  which are covered by the spectroscopy analyzer  9 , so that the water content of the pasture grass  1  can be made in the area where intrusion of light is blocked by the grass sending tube  21  including the spectroscopy analyzer  9 . Consequently, incidence of light from the outside to the determination head  8  is suppressed and the water content of the pasture grass  1  can be determined even more accurately. 
     Modified Embodiments of Embodiment 1 
     (1) The pasture grass water content determination device  20  can be disposed to protrude rearwardly from the machine body rear end of the tractor T. In this case, the pasture grass water content determination device  20 , when used, will be towed on the pasture land in association with forward traveling of the tractor T. Further, the pasture grass water content determination device  20  can be disposed at a lower portion of the tractor T, e.g. between the front and rear wheels  4 , in which case the pasture grass water content determination device  20  when used will be used to move on the pasture land in association with forward traveling of the tractor  20 . 
     (2) The work vehicle on which the pasture grass water content determination device  20  is mounted is not limited to a tractor T, but may be various kinds of work vehicles or a tractor T mounting various implements for carrying out various kinds of utility works. And, the pasture grass water content determination device  20  mounted on such work vehicles will take pasture grass  1  left in a pasture land into the grass sending tube  21  and determine the water content thereof inside this grass sending tube  21 . 
     For instance, the pasture grass water content determination device  20 , as shown in  FIG. 5 , may be provided in a rear area or a lower area of a tractor T mounting a reaping section M in a front area thereof. Further alternatively, the pasture grass water content determination device  20  may be provided in a front area, a rear area or a lower area of a self-propelled grass mower vehicle. Thus, the device may be provided in any area where it can be mounted. 
     The reaping section M mounted on a tractor T or the self-propelled grass mower vehicle will reap pasture grass  1  planted in a pasture land. The pasture grass  1  reaped in the pasture land will be taken into the grass sending tube  21  in association with passage of the pasture grass water content determination device  20  and their water content will be determined. With this, the water content of the pasture grass  1  can be determined accurately. 
     (3) Further, the work vehicle mounting the pasture grass water content determination device  20  may be a work vehicle configured to carry out work travel while collecting the pasture grass  1  in a pasture land. Such work vehicles are equipped with a conveying path  3  for conveying the collected pasture grass  1 . Then, the pasture grass water content determination device  20  will be mounted to the conveying path  3  with bypassing this conveying path  3 . 
     For example, as shown in  FIG. 6 , the work vehicle can be a harvester H. The harvester H collects the pasture grass  1  in a pasture land and discharges them onto a loader wagon W or the like. Then, the loader wagon W or the like will convey the collected pasture grass  1  to a silo, etc. The harvester H will convey the collected pasture grass  1  via the conveying path  3  and discharge the pasture grass  1  from the conveying path  3  onto the loader wagon W, etc. The pasture grass water content determination device  20  is mounted in this conveying path  3 , with the inlet and the discharging outlet of the pasture grass water content determination device  20  being connected to the conveying path  3 . For instance, the pasture grass water content determination device  20  may be mounted in the conveying path  3  via an attachment or the like. It will suffice as long as the raking-in section  22  can guide at least some of the pasture grass  1  conveyed in the conveying path  3  into the grass sending tube  21 . Further, as shown in  FIG. 8 , the pasture grass water content determination device  20  may include a curved portion  21   d  at least at one position of the grass sending tube  21 . With this, the pasture grass water content determination device  20  can be readily mounted in the conveying path  3  and also the pasture grass water content determination device  20  can be readily mounted in the conveying path  3  in such a manner to dispose the raking-in section  22  to readily rake in the pasture grass  1  inside the conveying path  3 . 
     Moreover, as shown in  FIG. 7 , the work vehicle can be a tractor T which tows a roll baler Ba as an “implement” or a self-propelled type roll baler Ba. The roll baler Ba collects pasture grass  1  in a pasture land and forms the pasture grass  1  into a roll bale, The roll baler Ba conveys the collected pasture grass  1  to an area for forming such a roll bale via the conveying path  3 . And, the pasture grass water content determination device  20  will be mounted in this conveying path  3  with the inlet and the discharging outlet of the pasture grass water content determination device  20  being connected to the conveying path  3 . For instance, the pasture grass water content determination device  20  may be mounted in the conveying path  3  via an attachment or the like. It will suffice as long as the raking-in section  22  can guide at least some of the pasture grass  1  conveyed in the conveying path  3  into the grass sending tube  21 . Further, the pasture grass water content determination device  20  such as the one as shown in  FIG. 8  may include a curved portion  21   d  in at least one position of the grass sending tube  21 . With this, the pasture grass water content determination device  20  can be readily mounted in the conveying path  3  and also the pasture grass water content determination device  20  can be readily mounted in the conveying path  3  in such a manner to dispose the raking-in section  22  to readily rake in the pasture grass  1  inside the conveying path  3 . Incidentally, since the pasture grass water content determination device  20  illustrated in  FIGS. 6 through 8  is provided in the conveying path  3 , the supporting portion  13  need not be provided. 
     As described above, if the pasture grass water content determination device  20  is provided in a harvester H or a roll baler Ba, the water content of the pasture grass  1  can be determined immediately before these pasture grass  1  are conveyed to a silo or the like or a roll bale is formed by the roll bailer Ba. Therefore, it becomes possible to effect any appropriate measure such as appropriately adjusting an additive to be added in the silo or the like or effecting addition of an additive required for water content adjustment in the process of roll bale formation or suspending the formation of roll bale per se. 
     (4) The cross sectional area of the grass sending tube  21  may be uniform, but this cross sectional area alternatively may progressively decrease in the entire grass sending tube  21  or in at least a part thereof before the spectroscopy analyzer  9 , from the front end (inlet) to the rear end (discharging outlet). In this case, at least one of the bottom portion  21   b , the side walls  21   a  and the top plate portion  21   c  may be tilted to the inner side of the grass sending tube  21 , or an inclined face may be provided in the inner face of the grass sending tube  21 . Further, the arrangement of the grass sending tube  21  is not limited to the arrangement having the bottom portion  21   b , the side walls  22   a  and the top plate portion  21   c , but the grass sending tube  21  may be any pipe into which raked-in pasture grass  1  are to be sent, and its cross sectional shape may be any shape. 
     (5) The spectroscopy analyzer  9  can effect not only the determination of water content, but can effect also determination of various qualities (properties) which can be determined optically. Further, the light  7  is not limited to near infrared beam, but may be other electromagnetic wave such as microwave, etc. Moreover, the technique of determining quality such as water content is not limited to spectroscopic analysis, but the technique may employ various kinds of determination instruments or determination methods such as determination using electrostatic capacitance. 
     (6) The spectroscopy analyzer  9  may be provided across and between the two side walls  21   a . Alternatively, it may be supported, with gaps relative to the two side walls  21   a,    
     (7) The pasture grass water content determination device  20  may be supported to the work vehicle via an elastic body (not shown) such as a spring. Specifically, the pasture grass water content determination device  20  may be supported to one end of the supporting portion  13  via an elastic body (not shown) such as a spring The other end of the supporting portion  13  is supported to the work vehicle. With this arrangement, when the pasture grass water content determination device  20  passes over the pasture grass  1  in association with traveling of the work vehicle, even if the pasture grass water content determination device  20  tends to rise due to the pressure from the pasture grass  1 , the pasture grass water content determination device  20  will be pushed down by the elastic force of the elastic body (not shown) such as a spring. Therefore, the pasture grass water content determination device  20  will follow e.g. undulation of the pasture grass  1  and the pasture grass  1  can be raked in in more efficient manner. 
     (8) The top plate portion  21   c  may be provided to extend to a position covering the raking-in section  22  from above or may be provided in such a manner not to cover the vicinity of the inlet of the grass sending tube  21  in which the raking-in section  22  is provided. The raking-in section  22  may be pivotally supported inside the grass sending tube  21 , but as long as it can feed the pasture grass  1  into the grass sending tube  21 , the raking-in section  22  may be provided at a position away from the grass sending tube  21 . The raking-in section  22  acting as a “grass taking section” may be configured to take the pasture grass  1  into the grass sending tube  21  with rotation of a blade  22   b . But, it may have any arrangement as long as it can take the pasture grass  1  into the grass sending tube  21 . For instance, the raking-in section  22  may comprise a suction instrument for sucking the pasture grass  1 . 
     (9) The blade  22   b  may be provided as a single blade in the width direction of the cylinder  22   a . Alternatively, a plurality of blades  22   b  may be provided in the width direction of the cylinder  22   a . Namely, at least one or some of blades  22   b  disposed side by side in the circumferential direction of the cylinder  22   a  may comprise a plurality of blades  22   b  juxtaposed in the width direction of the cylinder  22   a    
     (10) The layout of the spectroscopy analyzer  9  is not limited to the layout of it being provided in contact with the top plate portion  21   c  rearwardly of this top plate portion  21   c , but it may be provided with a spacing relative to the top plate portion  21   c . Further, the end portion of the spectroscopy analyzer  9  may be placed on the top plate portion  21   c.    
     (11) The raking-in section  22  can be configured to be capable of adjusting the amount of pasture grass  1  to be fed into the grass sending tube  21  in proportion with the traveling speed of the work vehicle. With this, an appropriate amount of pasture grass  1  will be fed into the grass sending tube  21  at an appropriate speed, so that the pasture grass  1  can be compressed in an efficient manner. For instance, the raking-in section  22  may be configured such that the rotational speed of the cylinder  22   a  is varied in accordance with the traveling speed of the work vehicle. 
     Embodiment 2 
     [Pasture Grass Water Content Determination Device] 
     Firstly, with reference to  FIG. 9  and  FIG. 10 , an example of arrangement of a pasture grass water content determination device (corresponding to a “quality determination device”) to be mounted on a work vehicle relating to this embodiment will be explained. 
     A pasture grass water content determination device  10  is configured to compress reaped pasture grass  1  and to determine the water content of the pasture grass  1  under their compressed state. This pasture grass water content determination device  10  is mounted on a work vehicle which travels in a pasture land and determines the water content of the pasture grass  1  while moving in association of traveling of the work vehicle. The pasture grass water content determination device  10  includes a spectroscopy analyzer (corresponding to a “quality determination instrument”)  9 , a grass pressing device  12  and a supporting portion  13  in the form of a parallel link structure. The pasture grass water content determination device  10  further includes a frame  11  supported to the supporting portion  13 . 
     The grass pressing device  12  is supported to the frame  11  and presses the pasture grass  1  in a pasture land. The grass pressing device  12  includes a grass collecting portion  12   a  and a grass pressing portion  12   b.    
     The grass collecting portion  12   a  comprises a plate-like member and is attached to the frame  11  to protrude forwardly from this frame  11  Here, the language “forwardly” corresponds to the direction of traveling of a work vehicle mounting the pasture grass water content determination device  10  in work travel for determination of water content of the pasture grass  1 . The bottom face of the grass collecting portion  12   a  has a shape which rises forwardly. In other words, the bottom face of the grass collecting portion  12   a  has a height from the ground surface which increases forwardly. Specifically, the bottom face of the grass collecting portion  12   a  comprises combination of a curved face which protrudes upwards in the front area and a curved face which protrudes downwards in the base end side (rear side) area. The grass collecting portion  12   a , with the above-described arrangement, collects or gathers the pasture grass  1  in the area downwardly of this grass collecting portion  12   a  in an efficient manner and can guide them to the area downwardly of the frame  11 . 
     The grass pressing portion  12   b  is provided in the bottom area of the frame  11 . The pasture grass  1  collected in the grass collecting portion  12   a  will be pressed along the slope of the grass collecting portion  12   a  and their compressed state is maintained in the area downwardly of the grass pressing portion  12   b . The grass pressing portion  12   b  comprises a plate-like member or a member which is flat at least in its lower face. Relative to the bottom face of the grass pressing portion  12   b , the grass collecting portion  12   a  is inclined, and the bottom face of the grass pressing portion  12   b  and the grass collecting portion  12   a  are formed continuous with each other. For instance, the grass pressing portion  12   b  and the grass collecting portion  12   a  will be formed integral with each other. 
     A spectroscopy analyze  9  is provided in the grass pressing portion  12   b  and determines the water content of the pasture grass  1 . The spectroscopy analyzer  9  irradiates a light  7  (see  FIG. 4 ) such as near infrared beam from a determination head  8  and receives the light  7  which passed through the pasture grass  1  and returned after repeated reflections. Then, the spectroscopy analyzer  9  analyzes the received light  7  (see  FIG. 4 ) to determine the water content of the pasture grass  1 . 
     An opening  12   c  is provided in the grass pressing portion  12   b . The spectroscopy analyzer  9  is supported to the grass pressing portion  12   b  by being fitted in the opening  12   c  of this grass pressing portion  12   b.    
     Thanks to the above-described arrangements, the spectroscopy analyzer  9  can irradiate the light  7  (see  FIG. 4 ) onto the pasture grass  1  which have been compressed sufficiently by the grass pressing device  12 , so that as has been described in details with reference to  FIG. 4 , diffused reflection of the irradiated light  7  (see  FIG. 4 ) by the pasture grass  1  can be suppressed. As a result, the spectroscopy analyzer  9  can determine the water content of the pasture grass  1  with high accuracy by appropriately receiving the light (see  FIG. 4 ) which has passed through the pasture grass  1 . 
     [Work Vehicle] 
     A work vehicle relating to this embodiment mounts the pasture grass water content determination device  10  described above. Next, with reference to  FIG. 11  in combination with  FIG. 10 , modes of using the pasture grass water content determination device  10  by the work vehicle relating to this embodiment will be explained. The following explanation is explanation using a tractor T as the work vehicle. 
     The pasture grass water content determination device  10  is mounted on the tractor T with the supporting portion  13  being connected to the machine body front end (e.g. the front end of the machine body frame). 
     The supporting portion  13  comprises a parallel link structure, so the pasture grass water content determination device  10  is vertically pivotable relative to the tractor T; thus vertical pivotal movements relative to the tractor T are allowed 
     Further, since the supporting portion  13  comprises a parallel link structure, the grass pressing portion  12   b  is constantly maintained parallel with the ground surface. As a result, the grass pressing portion  12   b  can compress the pasture grass  1  uniformly. 
     The pasture grass water content determination device  10  may be used either when the tractor T travels forwardly or when the tractor T travels reversely. But, this pasture grass water content determination device  10  will be mounted such that the grass collecting portion  12   a  is oriented toward the front side in the advancing direction of the tractor T. Namely, the pasture grass water content determination device  10  will be mounted such that the grass collecting portion  12   a  is positioned more forwardly than the grass pressing portion  12   b  on the front side in the advancing direction of the tractor T. 
     Here, pasture grass  1  grown in a pasture land are reaped and sun-dried (dried) in the pasture land, if needed. Sometimes, for readiness of collecting the pasture grass  1 , the pasture grass  1  may be left in the pasture land when appropriate and laid in the form of ridge for example. The tractor T will travel on such reaped pasture grass  1  in the pasture land, and in association with traveling of the tractor T, the grass pressing device  12  compresses the pasture grass  1 . And, the spectroscopy analyzer  9  will determine the water content of the pasture grass  1  under the compressed state. 
     As shown in  FIG. 9 ,  FIG. 10  and  FIG. 4 , the pasture grass water content determination device  10  relating to the present embodiment, due to the inclusion of the grass pressing device  12 , can press and compress the pasture grass  1 , so that the spectroscopy analyzer  9  can irradiate the light  7  onto the pasture grass  1  under the dense state; therefore, the water content of the pasture grass  1  can be determined accurately. 
     Here, since the spectroscopy analyzer  9  determines the water content of the pasture grass  1  with use of the light  7 , accurate determination of the water content becomes impossible if light incident from the outside other than the light  7  irradiated by the spectroscopy analyzer  9  enters the determination head  8 . 
     In the case of the pasture grass water content determination device  10  relating to this embodiment, as described above, the spectroscopy analyzer  9  is disposed within the opening  12   c  provided in the grass pressing portion  12   b . For instance, the spectroscopy analyzer  9  will be disposed such that the bottom face of the spectroscopy analyzer  9  is substantially flush with the bottom face of the grass pressing portion  12   b . Therefore, the determination head  8  of the spectroscopy analyzer  9  can irradiate the light  7   b  onto the pasture grass  1  which are being pressed by the grass pressing portion  12   b  and the spectroscopy analyzer  9 ; and in addition, since the grass pressing portion  12   b  is larger than the spectroscopy analyzer  9 , the water content can be determined for the pasture grass  1  in the area where intrusion of light is blocked by the spectroscopy analyzer  9  and the grass pressing portion  12   b . As a result, incidence of light to the determination head  8  from the outside is suppressed, so that the water content of the pasture grass  1  can be determined even more accurately, 
     Modified Embodiments of Embodiment 2 
     
         
         
           
             (1) The arrangement of the pasture grass water content determination device  10  is not limited to the arrangement of it being vertically pivotally supported to the machine body. Alternatively, the pasture grass water content determination device  10  may be configured to be vertically slidably to the machine body. 
           
         
       
    
     (2) The pasture grass water content determination device  10  may be disposed to protrude rearwardly from the machine body rear end of the tractor T, in which case the pasture grass water content determination device  10  is towed on the pasture land in association with forward traveling of the tractor T. Further alternatively, the pasture grass water content determination device  10  may be disposed at a lower portion of the tractor T, e.g. between the front and rear wheels  4 , in which case the pasture grass water content determination device  10  will be moved on the pasture land in association with forward traveling of the tractor T. 
     (3) The work vehicle such as the tractor T may mount the pasture grass water content determination device  10  only, but it may mount the pasture grass water content determination device  10  together with other implement. For example, as shown in  FIG. 12 , in the case of the tractor T mounting a roll baler Ba as an “implement”, the pasture grass water content determination device  10  may be mounted to the roll bailer Ba, or may be mounted to a self-propelled roll baler Ba. In the latter case, the pasture grass water content determination device  10  will be disposed forwardly of the area of the roll baler Ba for collecting the pasture grass  1 . 
     If the pasture grass water content determination device  10  is disposed forwardly of the area of the roll baler Ba for collecting the pasture grass  1  as described above, the water content of the pasture grass  1  can be determined immediately before a roll bale is formed by the roll baler Ba. Therefore, in accordance with the water content of the pasture grass  1 , it is possible take some appropriate measure such as addition of an additive required for water content adjustment in the process of forming the roll bale or suspending the formation of the roll bail per se. 
     Similarly, the pasture grass water content determination device  10  may be mounted not only to the roll baler Ba towed by the tractor T or the self-propelled roll baler Ba, but also to work vehicles of various configurations such as a loader wagon towed by the tractor T or a self-propelled loader wagon. With this, it is possible take some appropriate measure such as addition of an additive required for water content adjustment in the process of forming the roll bale or suspending the formation of the roll bale per se, in the course of various works carried out by the work vehicle. 
     (4) Further, the work vehicle mounting the pasture grass water content determination device  10  may effect the determination of water content of the pasture grass  1  not only for reaped pasture grass  1 , but also may effect the determination of water content of the pasture grass  1 , in addition to reaping of these pasture grass  1 . For instance, as shown in  FIG. 13 , the pasture grass water content determination device  10  may be provided in a rear area or a lower area of the tractor T mounting a reaping section M in its front area. Further alternatively, the pasture grass water content determination device  10  may be provided in a rear area or a lower area of a self-propelled tractor T. 
     The reaping section M mounted on the tractor T or the self-propelled grass mower vehicle will reap the pasture grass  1  planted in a pasture land. The reaped pasture grass  1  in the pasture land will be compressed in association with passage of the pasture grass water content determination device  10  thereon and the water content thereof will be determined, With this, the water content of the pasture grass  1  can be determined with high accuracy in an efficient manner. 
     (5) The configuration of the grass pressing device  12  is not limited to the configuration of compressing the pasture grass  1  in association with traveling. Alternatively, the grass pressing device  12  may be configured to mechanically press the pasture grass  1 . 
     (6) The grass pressing portion  12   b  may omit the opening  12   c , and the pasture grass water content determination device  10  may be provided at any desired position as long as it can determine the water content of the pasture grass  1  under the compressed state. For instance, the pasture grass water content determination device  10  may be configured to be supported to the lower face of the grass pressing portion  12   b.    
     (7) The use of the spectroscopy analyzer  9  is not limited to the determination of water content. The spectroscopy analyzer  9  can be used also for determinations of various qualities (properties) which can be determined optically. Further, the light  7  is not limited near infrared beam, but it may be any electromagnetic wave such as microwave. Further, the method of determination of qualities such as water content is not limited to the spectroscopy analysis, but the determination may employ various kinds of determination instruments or determination methods. 
     (8) The pasture grass water content determination device  10  may include an elastic body (not shown) such as a spring for urging the grass pressing device  12  downwards. With this, thanks to the elastic force of the elastic body (not shown) such a spring, the grass pressing portion  12   b  will be pressed downwards to press the pasture grass  1  in a reliable manner. 
     (9) The bottom face of the grass collecting portion  12   a  is not limited to the combination of two curved faces, but may include only one curved face protruding downwards. Further alternatively, the bottom face of the grass collecting portion  12   a  need not include any curved face at all. Further alternatively, the grass collecting portion  12   a  may have a shape whose left and right opposed ends rise up progressively. 
     (10) The spectroscopy analyzer  9  may be mounted on the grass pressing portion  12   b  at its opening  12   c . In this case, the spectroscopy analyzer  9  will be supported such that the determination head  8  is disposed in the opening  12   c  to be positioned close to the compressed pasture grass  1  downwardly of the determination head  8 . 
     INDUSTRIAL APPLICABILITY 
     The present invention allows determination of qualities of not only pasture grass, but of various kinds of plants and can be suitably used in various kinds of work vehicle. 
     DESCRIPTION OF SIGNS 
     
         
         
           
               1 : pasture grass 
               3 : conveying path 
               9 : spectroscopy analyzer (quality determination instrument) 
               10 : pasture grass water content determination device (quality determination device) 
               12 : grass pressing device 
               12   c : opening 
               13 : supporting portion 
               15 : elastic body 
               20 : pasture grass water content determination device (quality determination device) 
               21 : grass sending tube 
               22 : raking-in section (grass taking section) 
             Ba: roll baler (work vehicle) 
             H: harvester (work vehicle) 
             M: reaping section 
             T: tractor (work vehicle)