Abstract:
A seed meter is provided for planting multiple types of seed and rapidly switching between the types being planted in a single planting pass of a planting session of row-crop planting. The seed meter has a split seed meter reservoir with a pair of seed meter chambers flanked by or next to a pair of seed disks. Activation and deactivation of the seed disks within the seed meter are synchronized to selectively deliver one type of seed from one of the seed meter chambers for delivery out of a single seed tube of the seed meter, which may provide absolute and instantaneous on-the-go seed switching within a single row from each seed meter.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a divisional of U.S. Ser. No. 14/300,640, filed Jun. 10, 2017. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The invention relates generally to row-crop planters or seeders and, in particular, to seed meters of planters for planting multiple varieties of seed. 
       BACKGROUND OF THE INVENTION 
       [0003]    Modern farming practices strive to increase yields of agricultural fields. Technological advances of planters allow for better agronomic characteristics at the time of planting, such as providing more accurate seed depth, improved uniformity of seed depth across the planter, and improved accuracy of in-row seed spacing. However, a single field can have performance inconsistencies between different areas. That is because a field can have a wide variety of soil types and management zones such as irrigated and non-irrigated zones in different areas. Seed companies are developing multiple varieties of each of their seed product types, with the different varieties offering improved performance characteristics for different types of soil and management practices. Efforts have been made to plant multiple varieties of a particular seed product type in different areas of fields with different soil types or management zones. These efforts include planters that have different bulk fill hoppers and require the reservoir for each seed meter to be completely cleaned out or planted out before a different seed variety can be delivered to the seed meters. Some planters allow for planting two varieties and include two separate and distinct seed meters at every row unit. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention is directed to a seed meter that allows for absolute and instantaneous switching seed types being planted during a single planting pass, without requiring multiple seed meters at every row unit or emptying out or planting out a first seed type before switching to a different seed type. The seed meter has more than one seed disk in its housing for selectively planting one of multiple seed types. The seed meter is configured to activate a single seed disk and deactivate the others so that only seeds conveyed by the activated seed disk are delivered out of the seed meter for planting at a given time. By on-the-move synchronizing of activating and deactivating of the different seed disks within the seed meter, an absolute and instantaneous switching of the seed type being planted within a single row is achieved. 
         [0005]    According to one aspect of the invention, a seed meter is provided for planting multiple types of seed in a single planting pass during row-crop planting of an agricultural field. The seed meter has a housing supported relative to a row unit of a planter. A first seed disk is rotatable within the housing for conveying seeds of a first type through the housing and out of the seed meter. A second seed disk is rotatable within the housing for conveying seeds of a second type through the housing and out of the seed meter. The first and second seed disks may be parallel to or angled with respect to each other. A seed disk drive system activates and deactivates the first and second seed disks for selectively delivering a corresponding one of the first and second seed types out of the housing for planting of an agricultural field. This allows a producer to plant multiple varieties of seed within the same field in a single planting session and even during a single planting pass without having to add additional row units or seed meters. 
         [0006]    According to another aspect of the invention, the seed meter has a seed meter reservoir with a first seed chamber storing seeds of the first type within the housing for receipt by the first seed disk when the first seed disk is activated. A second seed chamber stores seeds of the second type within the housing for receipt by the second seed disk when the second seed disk is activated. A separator wall within the seed meter reservoir may separate the first and second seed chambers from each other. The separator wall may be arranged transversely between the first and second seed disks with the first seed chamber between the separator wall and the first seed disk and the second seed chamber between the separator wall and the second seed disk. Separate primary seed conduits may direct separately stored seed types from bulk storage into the seed chambers of the seed meter, which may include delivery of the seed from bulk storage into compartments of an on-row storage system which may be defined by a vented mini-hopper(s) that feeds the seed chambers of the seed meter. In another embodiment, a seed gate system(s) is arranged to selectively direct seeds of different types through a single primary seed conduit into different seed chambers of the seed meter, for example, by way of the compartments of the mini-hopper(s). In yet another embodiment, the on-row compartments provide the bulk storage of the different types of seed which are gravity-fed into the seed chambers of the seed meter. 
         [0007]    According to another aspect of the invention, the first and second seed disks are arranged generally parallel to each other. A single seed tube may receive seeds released from both the first and second seed disks for delivery onto the agricultural field. This provides a single unitary seed meter of relatively simple construction that can offer on-the-move absolute and instantaneous switching of the seed type being planted during a single planting pass. 
         [0008]    According to another aspect of the invention, the first and second seed disks are arranged at an angle with respect to each other. This provides a seed meter housing that encloses multiple seed disks that each releases seed at substantially the same seed release location within the seed meter housing for delivery out of a seed tube, which reduces seed bounce within the seed tube. 
         [0009]    According to another aspect of the invention, the housing of the seed meter has a first side portion and a second side portion. A first seed disk assembly is arranged within the first side portion of the housing for rotatably conveying individual seeds of a first type through the housing and out of the seed meter for individually planting the seeds of the first variety during row-crop planting of an agricultural field. A second seed disk assembly is arranged within the second side portion of the housing for rotatably conveying individual seeds of a second type through the housing and out of the seed meter for individually planting the seeds of the second variety during row-crop planting of the agricultural field. This allows for planting multiple varieties of seed within the same field without having to add additional row units or seed meters. 
         [0010]    According to another aspect of the invention, each of the first and second seed disk assemblies includes a seed disk rotatable within a cavity defined by the respective one of the first and second side portions of the housing. A seed disk drive system may selectively rotate the seed disks of the first and second seed disk assemblies independently with respect to each other. This allows for quick switching or changeovers from planting seeds of a first seed type to planting seeds of a second seed type. 
         [0011]    According to another aspect of the invention, the seed disk drive system includes a clutch arranged with respect to each of the first and second seed disk assemblies. Each clutch selectively engages/disengages transmission of a rotation driving power to the respective seed disk for permitting/preventing rotation of the corresponding seed disk of the first and second seed disk assemblies. The clutch may be an air clutch or an electromechanical clutch. This allows for a seed meter capable of delivering multiple types of seed by activating and/or deactivating multiple seed disks within the seed meter. 
         [0012]    According to another aspect of the invention, the seed disk drive system includes a motor drive at each of the first and second seed disk assemblies. A controller controls the motor drive(s) to permit/prevent transmission of a rotation driving power to the seed disks. In this way, rotation of one of the seed disks, a deactivated seed disk, can be stopped while the other seed disk, an activated seed disk, is rotated. The motor drive may be a pneumatic motor or an electric motor. This allows for a seed meter capable of delivering multiple types of seed by activating and/or deactivating multiple seed disks within the seed meter. 
         [0013]    According to another aspect of the invention, the seed meter has a seed tube that receives seeds released from both the first and second seed disk assemblies for delivery onto the agricultural field. This allows for sequentially delivering different types of seed from a single seed meter into a single seed bed. 
         [0014]    According to another aspect of the invention, a method of planting multiple types of seed in a single planting pass during planting of an agricultural field is provided. The method includes rotating a first seed disk in a seed meter to convey seeds of a first type through the seed meter and deliver the seeds of the first type onto a first location of an agricultural field. A second seed disk is rotated in the seed meter to convey seeds of a second type through the seed meter and deliver the seeds of the second type onto a second location of the agricultural field. The first seed disk may be arranged within a housing of the seed meter to rotate past a first seed chamber storing seeds of the first type within the housing of the seed meter. The second seed disk may be arranged within the housing to rotate past a second seed chamber storing seeds of the second type within the housing of the seed meter. An instantaneous switchover can be made from planting seeds of the first type to planting seeds of the second type. This can be done by deactivating the first seed disk and activating the second seed disk seed-type switching event. During the seed-type switching event, release of a final seed of the first seed type is sequentially followed by an initial seed of the second seed type. This can be done within a single row without creating a skip event. This provides maintaining a constant in-row seed spacing through the seed-type switching event, whereby an in-row seed spacing at a transition between the first and second seed types is the same as the in-row seed spacing within each of the first and second seed types. 
         [0015]    According to another aspect of the invention, each seed meter of a planter may be individually controlled to control switching from delivering seeds of the first seed type to delivering seeds of the second seed type on a per-row basis. Different groups of seed meters corresponding to different sections of a planter may be separately controlled to control switching from delivering seeds of the first type to delivering seeds of the second seed type from the planter on a per-section basis. All seed meters of the planter may be simultaneously controlled to control switching from delivering seeds of the first seed type to delivering seeds of the second seed type on a whole-planter basis. This allows for different versions of seed variety switchover control based on the amount of precision or pinpoint control needed for different seed variety placements within different fields or based on producer/operator preference. 
         [0016]    Other aspects, objects, features, and advantages of the invention will become apparent to those skilled in the art from the following detailed description and accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]    Preferred exemplary embodiments of the invention are illustrated in the accompanying drawings in which like reference numerals represent like parts throughout. 
           [0018]      FIG. 1  illustrates a pictorial view of a planter incorporating a seed meter in accordance with the present invention; 
           [0019]      FIG. 2A  illustrates a simplified schematic view of the planter of  FIG. 1  and cross-sectional representation of a seed meter in accordance with the present invention; 
           [0020]      FIG. 2B  illustrates a variant of the seed meter of  FIG. 2A ; 
           [0021]      FIG. 2C  illustrates another variant of the seed meter of  FIG. 2A ; 
           [0022]      FIG. 3  illustrates an exploded pictorial view of a variant of the seed meter of  FIG. 2A ; 
           [0023]      FIG. 4  illustrates a simplified schematic view of a variant of the seed meter shown in  FIG. 2A ; 
           [0024]      FIG. 5  illustrates a simplified side elevation view of a variant of the seed meter shown in  FIG. 2A ; and 
           [0025]      FIG. 6  illustrates a screen shot showing a seed-type prescription map for use with the planter incorporating the seed meter(s) in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0026]    Referring now to the drawings and specifically to  FIG. 1  and the simplified schematic representations of  FIGS. 2A-2C , seed meters  5  of row units  7  of a planter  9  are configured for planting multiple types or varieties of seed. As explained in greater detail elsewhere herein, each seed meter  5  can switch, for example, absolutely, instantaneously, and automatically, between planting of different types or varieties of seed during a single planting pass of row-crop planting of an agricultural field with the planter  9 . Planter  9  may be one of the EARLY RISER® series planters available from Case IH and is typically pulled by a traction device such as a tractor  11 . The planter  9  has a frame  13  that supports the multiple row units  7  that are substantially identical. Each row unit  7  includes a respective seed meter  5  and various support components for supporting the seed meter  5  and corresponding ground-engaging components. 
         [0027]    Referring now to  FIG. 1 , such support components include a sub-frame  15  that is connected to the frame  13  of the planter  9  by way of a parallel linkage system  16  ( FIG. 5 ) and supports the seed meter  5  and furrow opening  17  and closing mechanisms  19  toward front and back ends of the row unit  7 . The opening and closing mechanisms  17 ,  19  may include opener disks and closing disks, respectively, or other ground-engaging tools for opening and closing a furrow. Each row unit  7  may include a gauge wheel  21  configured for adjusting furrow depth by limiting soil penetration of the furrow-opening mechanism  17  while creating a furrow, and a press wheel  23  may be arranged to roll over the closed furrow to firm the soil over the seed to further close the furrow and promote favorable seed-to-soil contact. 
         [0028]    Referring now to  FIGS. 2A-2C , in these embodiments, seeds  25  are held in bulk storage in a bulk storage system  27  with at least one bulk fill hopper  29 , shown here in each of  FIGS. 2A-2C  as having two central bulk fill hoppers  29  supported by the frame  13  of the planter  9 . The bulk storage system  27  has multiple compartments  31 , shown here as spaces within each of the bulk-fill hoppers  29  that are separated by divider walls or partitions  33 . In another embodiment, the compartments  31  are defined by separate and discrete containers themselves, such as the bulk fill hoppers  29 . In another embodiment, such as that shown in  FIG. 5 , at least some of the bulk fill hoppers  29  are not centrally located with respect to the planter  9  and remote from the row units  7 , but are mounted on the row units  7  themselves in a gravity-feed relationship with the respective seed meters explained in greater detail elsewhere herein. Regardless of where the hoppers  29  are located, the different compartments  31  of the hoppers  29  may hold seeds  25  of a common plant type but different varieties or types  25   a ,  25   b  for planting in different type or variety zones of an agricultural field defined at least in part by characteristics relating to at least one of soil type and management type. Although the seed  25  may be described elsewhere herein as different types  25   a ,  25   b , it is understood that the description of the different types includes different varieties. In other words, the different types  25   a ,  25   b  of seed  25  include not only different varieties of the same plant species, but also different seed products. Different seed products can include seeds of different species, coated and uncoated seeds, such as insecticide coated and non-insecticide coated seeds. The different seed products can also include refuge in a bag seed and non-refuge in a bag seed, plant-parasite resistant seed and non-plant-parasite resistant seed such as cyst nematodes resistant seeds and non-cyst nematodes resistant seeds, herbicide-tolerant seed and non-herbicide tolerant seed, or other different products. 
         [0029]    Still referring to  FIGS. 2A-2C , three exemplary arrangements of seed meters  5  are shown in the three row units  7  as seed meters  5   a ,  5   b , and  5   c , in  FIGS. 2A, 2B, and 2C , respectively, each of which can plant multiple types or varieties of seed. Each seed meter  5  has a pair of metering assemblies  26  for singulating and selectively delivering different types  25   a ,  25   b  of seed  25  from the seed meter  5 . The seed meter  5   a  of  FIG. 5A  and the seed meter  5   b  in  FIG. 2B  have transversely arranged metering assemblies  26 . The seed meter of  FIG. 2C  has longitudinally arranged metering assemblies  26 . Regardless of whether the metering assemblies  26  are arranged transversely or longitudinally and referring again to  FIGS. 2A-2C , each seed meter  5  is operably connected to an airflow system  34  ( FIG. 4 ) that includes a positive air pressure source and a vacuum source for establishing positive and vacuum pressures and corresponding air flows for delivery seed  25  to the seed meters  5  and for moving the seeds  25  through the seed meter  5 . The positive air pressure source and vacuum sources can be known pumps, fans, blowers, and/or other known airflow system components. Each seed meter  5  has a housing  35  defining the first and second side portions  37 ,  39  shown as including a left-hand cover (LH) and a right-hand cover (RH). In the seed meters  5   a ,  5   b  of  FIGS. 2A-2B  with the transversely arranged metering assemblies  26 , each of the left-hand and right-hand covers LH, RH has a vacuum inlet (VI) for connecting the first and second side portions  37 ,  39  to the vacuum source. In the seed meter  5   c  of  FIG. 2C  with the longitudinally arranged metering assemblies  26 , the left-hand cover LH is shown with two vacuum inlets (VI) for connecting the first side portion  37  to the vacuum source at two locations. An intermediate portion  41  of the housing  35  is arranged between the first and second side portions  37 ,  39 . A seed meter reservoir  43  defining a multiple chamber or split reservoir is arranged within the intermediate portion  41  of the housing  35 . In the seed meter  5   c  of  FIG. 2C  with the longitudinally arranged metering assemblies  26 , the reservoir  43  extends from the intermediate portion  41  into the second side portions  39  of the housing  35 . In the seed meters  5   a ,  5   b  of  FIGS. 2A-2B  with the transversely arranged metering assemblies  26 , a separator wall  45  within the seed meter reservoir  43  separates the seed meter reservoir into a first seed chamber  47  storing seeds of the first type  25   a  and a second seed chamber  49  storing seeds of the second type  25   b  within seed meter housing  35 . 
         [0030]    Referring now to  FIGS. 2A, 2B, and 3 , in the seed meters  5   a ,  5   b  with the transversely arranged metering assemblies  26 , one of the metering assemblies  26  includes a first seed disk assembly  51  having a first seed disk  53  arranged within the first side portion  37  of the seed meter housing  35 . The other metering assembly  26  includes a second seed disk assembly  55  having a second seed disk  57  arranged within the second side portion  39  of the seed meter housing  35 . Inwardly facing surfaces  59 ,  61  of the first and second seed disks  53 ,  57  face toward and define transverse outer peripheries of the first and second seed chambers  47 ,  49 . Outwardly facing surfaces  63 ,  65  of the first and second seed disks  53 ,  57  face toward and are spaced from the left-hand and right-hand covers LH, RH of the first and second side portions  37 ,  39 . This provides vacuum pressure chambers  67  between the outwardly facing surface  63  and the left-hand cover LH in between the outwardly facing surface  65  and right-hand cover RH as imparted by the negative pressure airflow through vacuum inlets VI of the left-hand and right-hand covers LH, RH of the seed meter housing first and second side portions  37 ,  39 . The vacuum pressure in the vacuum pressure chamber  67  allows seeds  25  to be drawn and held against the seed pockets and/or holes  69  ( FIG. 3 ) of the seed disks  53 ,  57  to rotatably convey the seeds  25  through the seed meter housing  35  to be released from the seed disk(s)  53 ,  57  within a discharge segment  71  ( FIG. 2A-2B ) at release locations  73  in the seed meter housing  35 . The discharge segment  71  is defined between a forward facing wall  75  of the seed meter housing  35 , the inwardly facing surfaces  59 ,  61  of the seed disks  53 ,  57 , and a divider wall  77 . The divider wall  77  extends in a transverse direction through the interior of the housing  35 , across a front of the seed meter reservoir  43 , and between the seed disks  53 ,  57 . 
         [0031]    Referring now to  FIG. 2C , the above description of the seed meters  5   a ,  5   b  of  FIGS. 2A-2B  with the transversely arranged metering assemblies  26  applies to the seed meter  5   c  of  FIG. 2C  with the longitudinally arranged metering assemblies  26 , while differing in the following ways. In the seed meter  5   c  with the longitudinally arranged metering assemblies  26 , there is no separator wall  4  and the left-hand cover LH has two vacuum inlets VI aligned with the first and second seed disk assemblies  51 ,  55 . The first and second seed chambers  47 ,  49  are spaced from each other at front and back ends of the seed meter  5   c , respectively, with a pair of divider walls  77  and the discharge segment  71 , longitudinally separating the first and second seed chambers  47 ,  49 . 
         [0032]    Referring again to  FIG. 2 , the seed meter  5   a  has its seed disk assemblies  51 ,  55  and seed disks  53 ,  57  transversely aligned and arranged parallel to each other. As shown in  FIG. 2B , the seed meter  5   b  has its seed disk assemblies  51 ,  55  and seed disks  53 ,  57  transversely aligned and arranged at an angle with respect to each other, whereby axes of rotation of the seed disks  53 ,  57  intersect to define an included angle of less than 180°. This embodiment shows the axis of rotation of the seed disks  53 ,  57  of seed meter  5   b  with an angle of about 30°, and the seed meter housing  35  defining a tapering width providing a generally V-shaped cross-sectional configuration. When comparing the two embodiments of the seed meters  5   a ,  5   b  of  FIG. 2A-2B  with the transversely arranged metering assemblies  26 , the V-shaped seed meter  5   b  ( FIG. 2B ) with the angled seed disks  53 ,  57 , has release locations  73  that are longitudinally aligned and transversely spaced and relatively closer to each other than the longitudinally aligned and transversely spaced release locations  73  of the seed meter  5   a  ( FIG. 5A ) with the parallel seed disks  53 ,  57 . The seed meter  5   c  of  FIG. 2C  with the longitudinally arranged metering assemblies  26  has release locations  73  that are transversely aligned and longitudinally spaced with respect to each other. Regardless, and referring again to  FIGS. 2A-2C , the release locations  73  are arranged to allow for dropping the seed  25  from the respective disk(s)  53 ,  57  through an outlet  79  of the seed meter housing  35  of the seed meter  5  and into an inlet  81  of a common single seed tube  83  ( FIG. 3 ) that delivers the seed  25  onto the agricultural field, which allows for selective release of one of the seed types  25   a ,  25   b  at a given time and/or a given area of an agricultural field, as controlled by a control system  85 . 
         [0033]    Referring now to  FIGS. 2A-2C and 4 , the control system  85  controls selective delivery of the seed types  25   a ,  25   b  out of the seed meters  5  and initial delivery of the seed types  25   a ,  25   b  from the compartments  31  of the bulk fill hoppers  29  to the first and second seed chambers  47 ,  49  of the seed meter reservoir  43 . Control system  85  includes a planter controller  87  and a tractor controller  89  that operably communicate with each other, for example, by way of an ISOBUS connection, for coordinating controls of planter  9  such as the seed meters  5  and tractor  11  ( FIG. 1 ) based on the type or variety zones VZ 1 , VZ 2 , VZ 3  of the agricultural field, which may correspond to a seed type or variety prescription map PM as shown in  FIG. 6 . 
         [0034]    Referring again to  FIGS. 2A-2C , the planter controller  87  is shown including a controller  91  and a power supply  93 . The controller  91  of the planter controller  87  can include an industrial computer or, e.g., a programmable logic controller (PLC), along with corresponding software and suitable memory for storing such software and hardware including interconnecting conductors for power and signal transmission for controlling electronic, electro-mechanical, and hydraulic components of the seed meter  5  and other components of the planter  9 . The tractor controller  89  is configured for controlling operations of the tractor  11  such as controlling steering, speed, braking, shifting, and other operations of the tractor  11 . The tractor controller  89  is shown as including a controller  95  and power supply  97 . The tractor controller  89  is configured for controlling the functions of the tractor  11  by controlling the various GPS steering, transmission, engine, hydraulic, and/or other systems of the tractor  11 . Like the controller  91  of the planter controller  87 , the controller  95  of the tractor controller  89  can include an industrial computer or, e.g., a programmable logic controller, along with corresponding software and suitable memory for storing such software and hardware including interconnecting conductors for power and signal transmission for controlling electronic, electro-mechanical, and hydraulic components of the tractor  11 . A tractor interface system  99  is operably connected to the tractor controller  89  and includes a monitor and various input devices to allow an operator to see the statuses and control various operations of the tractor  11  from within the cab of the tractor  11 . The tractor interface system  99  may be a MultiControl Armrest™ console available for use with the Maxxum™ series tractors from Case IH. 
         [0035]    Referring now to  FIG. 4 , the control system  85  controls the loading of the seed types  25   a ,  25   b  and the first and second seed chambers  47 ,  49  of the seed meter reservoir  43  by controlling a primary feed system  101 , which allows for use of a single primary seed conduit  103  to selectively direct the different seed types  25   a ,  25   b  into the different seed chambers  47 ,  49 . Primary feed system  101  includes seed metering rollers  105  which may be calibrated fluted rollers arranged at outlets  107  of the bulk fill hoppers  29 , or the separate compartments  31  of a single bulk fill hopper  29  that holds both of the seed types  25   a ,  25   b  in its separate compartments  31 . The rollers  105  are driven to rotate by electric, pneumatic, or hydraulic motors (not shown) as controlled by the control system  85  to control release of the seed varieties  25   a ,  25   b  from the respective compartments  31  into a conduit segment  109  that connects to the primary seed conduit  103 . As shown in  FIG. 4 , in this embodiment, the primary seed conduit  103  connects to an inlet  111  of an on-row storage system  113  that includes a vented mini-hopper  115 . The mini-hopper  115  has a separator wall  117  that divides its interior space to split compartments, shown as first and second mini-hopper chambers  119 ,  121  which feed into and are connected with the first and second seed chambers  47 ,  49  of the seed meter reservoir  43 . The control system  85  selectively fills and maintains seed pool level of the first and second mini-hopper chambers  119 ,  121  by controlling a gate  123  of the primary feed system  101  arranged in the inlet  111  of the on-row storage system  113 . Gate  123  is shown as a pivoting blade that can be actuated by an actuator (not shown) controlled by the control system  85  to permit or prevent flow through the inlet  111  into the first and second mini-hopper chambers  119 ,  121  by blocking or leaving uncovered corresponding openings  125 ,  127 . Seed level sensors  129  are arranged in the first and second mini-hopper chambers  47 ,  49 ,  119 ,  121  to provide signals allowing the control system  85  to evaluate how much seed  25  of the seed types  25   a ,  25   b  is in the first mini-hopper chamber  119  and second mini-hopper chamber  121 . In this way, the compartments  3  of the centrally located bulk fill hopper(s)  29  feed and maintain adequate fill level(s) of the seed varieties  225   a  and  25   b  in the first and second mini-hopper chambers  119 ,  121 , as controlled by the control system  85 . 
         [0036]    Referring now to  FIG. 5 , this is a variation of the system described above with respect to  FIG. 4  that includes both remote centrally located bulk storage and on-row bulk storage of seed  25 . Instead of storing all of the seed types  25   a ,  25   b  in centrally located bulk fill hoppers  29 ,  FIG. 5  shows a variation in which only a seed type with a greater required use-volume seed type(s), shown as seed type  25   a  corresponding to a primary seed type, is stored in a compartment  31  of the centrally located bulk fill hopper(s)  29  represented as seed type  25   a  stored in bulk fill hopper  29   a . A relatively lesser required use-volume seed type(s), shown as seed type  25   b  as a secondary seed type, is stored in bulk on-row in the compartment  31  of the on-row bulk fill hopper  29 , represented as bulk fill hopper  29   b . In this embodiment, within each seed meter  5 , one of the seed disk assemblies  51 ,  55  is fed the primary seed type  25   a  from the mini-hopper  115 , which itself pneumatically receives the primary seed type  25   a  from the remote and centrally located storage of the bulk fill hopper  29   a . The other one of the seed disk assemblies  51 ,  55  is gravity-fed the secondary seed type  25   b  from the on-row bulk fill hopper  29   b.    
         [0037]    Referring again to  FIGS. 2A-2C , regardless of the particular location(s) of bulk storage of the seed  25 , the control system  85  is configured to control each seed meter  5  to switch, for example, absolutely, instantaneously, and automatically, between planting of different types or varieties of seed during a single planting pass of row-crop planting of an agricultural field with the planter  9 . This may be done according to predetermined criteria, for example, based on the variety zones VZ 1 , VZ 2 , VZ 3  of the agricultural field provided by the seed type or variety prescription map PM ( FIG. 5 ), to accommodate selectively planting the seed types  25   a ,  25   b  based at least in part by characteristics relating to the soil type(s) and management type(s) of the variety zones VZ 1 , VZ 2 , VZ 3 . The control system  85  can absolutely and instantaneously switch which one of the seed types  25   a ,  25   b  is being planted by activating and/or deactivating the seed disk assemblies  51 ,  55  to shut off half of the seed meter  5  and only deliver seed  25  from the half of the seed meter  5  that is not shut off, in a precisely synchronized manner. 
         [0038]    Still referring to  FIGS. 2A-2C , each seed meter  5  has a seed disk drive system  131  that is controlled by the control system  85  for selectively activating and/or deactivating the seed disk assemblies  51 ,  55 . As shown in  FIG. 2A , the seed meter  5   a  with the parallel and transversely aligned seed disks  53 ,  57  is shown with mechanical chain drives  133  that deliver rotating driving power from a rotating shaft  135  through clutches  137  and chains  139 , which rotate sprockets that are attached to spindles  141  that drive rotation of the seed disks  53 ,  57 . Clutches  137  may be, for example, air clutches or electromechanical clutches, noting that the corresponding drives may include pneumatic motors or electric motors. Regardless, the control system  85  is operably connected to each of the clutches  137  to either disengage and prevent transmission of the rotation driving power from the shaft  135  or engage and permit transmission of the rotation driving power from the shaft  135  to each of the seed disks  53 ,  57 . This selectively rotates the seed disks  53 ,  57  in a direction toward the forward facing wall  75  to convey the seed  25   a ,  25   b  from the first and second seed chambers  47 ,  49  for release into the seed tube  83 . As shown in  FIG. 2B , in the seed meter  5   b  with the transversely aligned and angled seed disks  53 ,  57 , the seed disks  53 ,  57  are also rotated in a direction toward the forward facing wall  75  to convey the seeds  25   a ,  25   b  from the first and second seed chambers  47 ,  49  for release into the seed tube  83 . As shown in  FIG. 2C , in the seed meter  5   c  with the longitudinally aligned seed disks  53 ,  57 , the seed disk  53  is rotated away from the forward facing wall  75  and the seed disk  57  is rotated toward the forward facing wall  75  to respectively convey seeds  25   a ,  25   b  from the first and second seed chambers  47 ,  49  toward the seed tube  83  in a central portion of the seed meter  5   c . In  FIGS. 2B-2C , each of the seed meters  5   b ,  5   c  is respectively shown with a direct drive-type seed disk drive system  131  having motor drives  143 . The motor drives  143  may include pneumatic motors or electric motors that rotate the spindles  141 , driving rotation of the seed disks  53 ,  57 . It is understood that the motor drives  143  may instead rotate the seed disks  53 ,  57  by rotating hubs, outer peripheries, or other portions of the seed disks  53 ,  57 . Regardless, the control system  85  is operably connected to each of the motor drives  143  to either disengage and prevent transmission of the rotation driving power from the motor drives  143  or engage and permit transmission of the rotation driving power from the motor drives  143  to each of the seed disks  53 ,  57 . 
         [0039]    Referring now to  FIGS. 2A-2C and 6 , during use, an operator first displays the seed type or variety prescription map PM ( FIG. 6 ) on the computer display or monitor of the tractor interface system  99 , which would typically be inside the tractor cab. The prescription map PM displays which type or variety zones VZ 1 , VZ 2 , VZ 3  are where in the agricultural field and which seed types  25   a ,  25   b  can be planted in the variety zones VZ 1 , VZ 2 , VZ 3 . As shown in  FIG. 6 , in this embodiment, seed type  25   a  is shown as acceptable for use in variety zones VZ 1  and VZ 3 , corresponding to recommended varieties A and C. Seed type  25   b  is shown as acceptable for use in variety zone VZ 2 , corresponding to a recommended variety B. The operator inputs which seed type  25   a ,  25   b  is stored in compartments  31  of the bulk storage system  27  through the tractor interface system  99 . The prescription map PM may also contain the seed population that is to be planted for each type or variety  25   a ,  25   b . The seed population could also be varied within the field based on soil type, organic matter, etc. The size of the seeds can also be input into the tractor interface system  99 . This information could also be made available in the database that is built from the desktop software when the prescription map PM was created. 
         [0040]    Referring again to  FIG. 4 , the control system  85  then determines seed level in each of the first and second mini-hopper chambers  119 ,  121  based on a signal(s) from the corresponding seed level sensors  129 . If the seed level in the first and second mini-hopper chambers  119 ,  121  is below a certain predetermined level corresponding to an amount needed for making at least one planting pass or starting planting, then the control system  85  sends a signal to rotate the metering roller(s)  105  of the compartment  31  holding the seed type  25   a ,  25   b  that was determined to be low. This releases the particular low seed type(s)  25   a ,  25   b  through the primary seed conduit  103 . The control system  85  also sends a signal to actuate the gate  123  at the inlet  111  of the on-row storage system  113  to ensure that the seed type  25   a ,  25   b  released from the bulk storage system  27  is directed to the correct one of the first and second mini-hopper chambers  119 ,  121  of the mini-hopper  115 . 
         [0041]    Referring again to  FIGS. 2A-2C , by way of the GPS of the tractor controller  89 , the control system  85  is able to determine which seed type  25   a ,  25   b  is to be planted by each of the seed meters  5  based on the prescription map PM ( FIG. 6 ). For example, if seed type  25   a  is to be planted from a particular row unit  7  of the planter  9 , the control system  85  activates the seed disk drive system  131  that activates the seed disk assembly  51  and rotates and delivers seed  25  of seed type  25   a  from the seed disk  53  and deactivates the seed disk drive system  131  that deactivates the seed disk assembly  55  and prevents rotation of and delivery of seed  25  of seed type  25   b  from the seed disk  57  at that particular row unit  7 . This synchronized activating and deactivating of the seed disk assemblies  51 ,  55  provide a seed-type switching event. During the seed-type switching event, which may correspond to the planter  9  and/or tractor  11  crossing from one variety zone to another according the prescription map PM ( FIG. 5 ) and detected by the GPS of the tractor controller tractor controller  89 , release of a final seed  25  of the previously planted type is sequentially followed by an initial seed  25  of a subsequent or currently planted seed type. This can be done within a single row without creating a skip event, maintaining a constant in-row seed spacing through the seed-type switching event, whereby an in-row seed spacing at a transition between the first and second seed types is the same as the in-row seed spacing within each of the first and second seed types  25   a ,  25   b.    
         [0042]    Still referring to  FIGS. 2A-2C , the control system  85  can be configured to individually control each of the seed meters  5  in this way to control switching from delivering seeds  25  of the first seed type  25   a  to delivering seeds  25  of the second seed type  25   b  on a per-row basis. In another embodiment, the control system  85  is configured to control groups of seed meters  5  in the same way within the same section of the planter  9 , for example, by giving common commands to all of the seed meters  5  within the same outer wing section(s) and/or inner or middle sections. This allows the control system  85  to control switching from delivering seeds  25  of the first type  25   a  to delivering seeds  25  of the second seed type  25   b  from the planter on a per-section basis. In yet another embodiment, the control system  85  is configured to control all of the seed meters  5  of the planter  9  in the same way. This allows for controlling switching from delivering seeds  25  of the first seed type  25   a  to delivering seeds  25  of the second seed type  25   b  on a whole-planter basis. 
         [0043]    Many changes and modifications could be made to the invention without departing from the spirit thereof. The scope of these changes will become apparent from the appended claims.