# Patent

## Title
Agricultural system for field preparation

## Abstract

An agricultural system includes a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field. The system includes a plurality of row-cleaning devices attached in parallel strip positions along the tow bar. Each row-cleaning device has a rigid frame, a leading coulter, one or more furrow-opener disks, and a pivotable row-cleaning linkage. The disks have a leading edge adjacent to a trailing edge of the coulter. The row-cleaning linkage is attached to the rigid frame, with the coulter and disks being coupled to the rigid frame via the row-cleaning linkage. The system further includes a roller device between two adjacent parallel strip positions and attached at each end to a respective rigid frame via a respective pivotable roller linkage. The roller linkage is independently movable relative to the row-cleaning linkage.

## Background
FIELD OF THE INVENTION
The present invention relates generally to agricultural equipment and, more particularly, to a system having a roller device for preparing a field with leftover residual plant matter.
BACKGROUND OF THE INVENTION
As plant matter is leftover on a field from one season to the next, farming operations continue to struggle with residual stubble when preparing the field for a new crop. These challenges are especially evident in no-till farming, which has become more popular over the recent years. For example, planting seeds between rows of leftover corn stalks is difficult without removing or minimizing the presence of the corn stalks in the planted rows.
Thus, it would be desirable to develop a system that overcomes the problems and limitations associated with leftover residual plant matter.
SUMMARY OF THE INVENTION
In accordance with one embodiment, an agricultural system includes a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field. The system further includes a plurality of row-cleaning devices attached in parallel strip positions along the tow bar, and at least one roller device. Each row-cleaning device includes a rigid frame for attachment to the tow bar, a leading coulter, and one or more furrow-opener disks. The furrow-opener disks are in a trailing position relative to the leading coulter, each of the furrow-opener disks having a leading edge adjacent to a trailing edge of the leading coulter. Each row-cleaning device further includes a pivotable row-cleaning linkage attached to the rigid frame, the leading coulter and the furrow-opener disks being coupled to the rigid frame via the pivotable row-cleaning linkage. The roller device extends between two adjacent parallel strip positions and is attached at each end to a respective rigid frame via a respective pivotable roller linkage. The pivotable roller linkage is independently movable relative to the pivotable row-cleaning linkage.
In accordance with another embodiment, an agricultural system includes a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field. The system further includes a plurality of row-cleaning devices attached in parallel strip positions along the tow bar, the plurality of row-cleaning devices including a first row-cleaning device and a second row-cleaning device. The first row-cleaning device is attached in a first strip position and includes a first rigid frame for attachment to the tow bar, a first leading coulter, and one or more first furrow-opener disks in a trailing position relative to the first leading coulter. The first row-cleaning device includes a first pivotable row-cleaning linkage attached to the first rigid frame, the first leading coulter and the first furrow-opener disks being coupled to the first rigid frame via the first pivotable row-cleaning linkage. The second row-cleaning device is attached in a second strip position, the second strip position being adjacent and parallel to the first strip position, the second row-cleaning device including a second rigid frame for attachment to the tow bar, a second leading coulter, one or more second furrow-opener disks in a trailing position relative to the second leading coulter. The second row-cleaning device further includes a second pivotable row-cleaning linkage attached to the second rigid frame, the second leading coulter and the second furrow-opener disks being coupled to the second rigid frame via the second pivotable row-cleaning linkage. The system further includes a roller device attached between the first row-cleaning device and the second row-cleaning device, the roller device including a first pivotable roller linkage attached at a first end of the roller device and being independently movable from the first rigid frame. The roller device further includes a second pivotable roller linkage attached at a second end of the roller device and being independently movable from the second rigid frame, and at least one roller bearing mounted along a rotational axis of the roller device.



BRIEF DESCRIPTION OF THE DRAWINGS
The invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings.
FIG. 1 is a perspective view of an agricultural system having a roller device and a row-cleaning device.
FIG. 2A is a top view of the agricultural system of FIG. 1.
FIG. 2B is a top view of the agricultural system of FIG. 1 illustrated with an optional roller device attached instead of the row-cleaning device.
FIG. 3 is a side view of the agricultural system of FIG. 1 without the row-cleaning device.
FIG. 4 is a front view of the agricultural system of FIG. 1 without the row-cleaning device.
FIG. 5 is a side view of the agricultural system of FIG. 1.
FIG. 6 is a front view diagrammatic illustrating roller devices having a single central roller bearing.
FIG. 7 is front view diagrammatic illustrating roller devices having two roller bearings at respective ends.
FIG. 8 is a side view of an agricultural system having a leading residue-clearing sub-assembly, a trailing tillage and depth-control-subassembly, and a roller device.
FIG. 9 is a perspective view of the agricultural system of FIG. 8.
FIG. 10 is a top view of the agricultural system of FIG. 8.



DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
Although the invention will be described in connection with certain preferred embodiments, it will be understood that the invention is not limited to those particular embodiments. On the contrary, the invention is intended to cover all alternatives, modifications, and equivalent arrangements as may be included within the spirit and scope of the invention as defined by the appended claims.
Turning now to the drawings and referring first to FIGS. 1 and 2A, an agricultural system 100 includes a tow bar 102 for attachment to a towing vehicle, such as a tractor. The tow bar 102 is in a trailing position relative to a direction of movement V (see FIG. 2A) along a field 130 and includes a row unit 103a. 
The row unit 103a includes a row-cleaning device 104 and a rigid frame 106 for attachment to the tow bar 102 The row-cleaning device 104 includes a leading coulter 108 and a pair of furrow-opener disks 110 that are attached in a trailing position relative to the leading coulter 108, each of the furrow-opener disks 110 having a leading edge 110a adjacent to a trailing edge 108a of the leading coulter 108. Only one of the furrow-opener disks 110 is visible in FIG. 1, with the second of the furrow-opener disks 110 being visible in FIG. 2A.
More specifically, the furrow-opener disks 110 have the respective leading edges 110a adjacent to each other and near the trailing edge 108a of the leading coulter 108. The leading coulter 108 is positioned such that the leading edges 110a of the two furrow-opener disks 110 are obscured by the trailing edge 108a of the leading coulter 108 from a front farming position. The front farming position is forward of the row-cleaning device 104 along the direction of movement V along the field 130.
The row-cleaning device 104 is attached to the agricultural system 100 in a respective strip position B of a plurality of parallel strip positions along the tow bar 102. As further illustrated in FIG. 4, and described in more detail below, the parallel strip positions include at least the strip positions A-D.
A pivotable row-cleaning linkage 112 is attached to the rigid frame 106. The leading coulter 108 and the furrow-opener disks 110 are coupled to the rigid frame 106 via the pivotable row-cleaning linkage 112. Additionally, a supplemental force for up-down movement is provided via a row-cleaning actuator 113. The row-cleaning linkage 112 is a parallel linkage according to one exemplary embodiment.
A first roller device 114a has a first end 116a and a second end 118a. The first end 116a is attached to the rigid frame 106 via a pivotable roller linkage 120. More specifically, the first end 116a is directly attached to a separator frame 121, which, in turn, is attached to the roller linkage 120. The second end 118a is attached in a similar manner as the first end 116a, near the parallel strip position A, illustrated in FIG. 2A, and to an adjacent rigid frame via another pivotable roller linkage. The roller linkage 120 is independently movable relative to the row-cleaning linkage 112 and, according to an exemplary embodiment, is a parallel linkage.
A second roller device 114b has a first end 116b and a second end 118b. The second roller device 114b is attached similarly to the first roller device 114a, with the first end 116b being attached to an opposite side of the separator frame 121, for indirect attachment to the rigid frame 106 via the roller linkage 120. The second end 118b of the second roller device 114b is near a respective parallel strip position C, illustrated in FIG. 4, and attached to an adjacent rigid frame via another pivotable roller linkage.
Each of the roller devices 114a, 114b includes a plurality of roller protrusions 128 that extend outwardly from a peripheral surface of the respective roller device 114a, 114b. The roller protrusions 128 are attached, for example, to the respective peripheral surface via welding or mechanical fasteners. One advantage of the roller protrusions 128 is directed to reducing the amount of force required to crush residual plant matter, based on the reduction of surface area of contact surfaces between the roller devices 114a, 114b and residual plant matter. Alternatively, the roller protrusions 128 are integrally formed from a single piece of material, for example, by machining the roller devices 114a, 114b with the roller protrusions 128 in a unitary construction. Alternatively yet, the roller devices 114a, 114b lack any roller protrusions 128 and are generally cylindrically shaped segments with substantially smooth surfaces.
The roller devices 114a, 114b are generally cylindrically shaped with a hollow (or partially hollow) interior 129 through which a supporting axle is mounted (as illustrated in FIGS. 6 and 7) for supporting the rotational motion of the roller devices 114a, 114b. In alternative examples, the roller devices 114a, 114b are solid cylinders, with a central hole for accommodating the supporting axle, or partially hollow cylinders. Added material in the hollow interior 129 increase the weight and strength of the roller devices 114a, 114b to further increase the crushing capability of the roller devices 114a, 114b. Less material in the hollow interior 129 increase the flexibility of the roller devices 114a, 114b to move past terrain obstacles when encountered in the field 130.
In the illustrated embodiment, the roller devices 114a, 114b are mounted in a trailing position relative to the row-cleaning device 104. However, in an alternative embodiment the roller devices 114a, 114b are mounted in a forward position relative to the row-cleaning device 104.
In yet other alternative embodiments, at least one of the roller devices 114a, 114b is a crimping device attached to an agricultural device having one or more separators. The crimping device is described in more detail in U.S. Patent Application Publication No. 2013/0000535 to Charles H. Martin and Dominic R. Martin, titled “Agricultural Field Preparation Device,” published on Jan. 3, 2013, and which is herein incorporated by reference in its entirety.
The agricultural system 100 is movable in a direction V along a field 130 in which standing residual plant matter 132 forward of the row-cleaning device 104 is leveled by the roller device 114a into crushed residual plant matter 134. The residual plant matter, such as small grain cover crop, can include (for example) barley, wheat, oats, spelt, rye, clover, weeds, etc.
The cover crops are typically planted after a primary crop has been harvested, such as corn, in order to reduce compaction of the soil. The type of field preparation that typically occurs simultaneously with crushing of the standing residual plant matter 132 is typically planting of a primary crop, such as corn. However, the agricultural system 100 is not limited to planting, and may include spreading fertilizer or other type of field preparation associated with “no-till” or other types of reduced tillage techniques, such as strip-tilling, if desired.
Referring to FIG. 2B, the agricultural system 100 is configured to include a mini-roller device 115, instead of the row-cleaning device 104. The mini-roller device 115 is sufficiently large to cover the surface area that would otherwise be strip B. As such, the mini-roller device 115, together with the first and second roller devices 114a, 114b, level and crush the standing residual plant matter 132 forward of the mini-roller device 115 without creating a strip between the first and second roller devices 114a, 114b. Instead, a single patch of crushed residual plant matter 134 is formed behind the agricultural system 100.
The mini-roller device 115 can be a miniature version of the roller device 114a, being attached to the row-cleaning linkage 112 (instead of the leading coulter 108 and the furrow-opener disks 110). Optionally, the mini-roller device 115 can be any size that sufficiently covers the surface area otherwise left uncovered between the first and second roller devices 114a, 114b. 
Referring to FIG. 3, the roller linkage 120 includes a pair of parallel links 123 pivotably coupled between the rigid frame 106 and the separator frame 123. Pivotable movement of the parallel links 121 allows up-down movement of the roller device 114a relative to the ground. More specifically, in this example the up-down movement is achieved in response to an actuator force provided by a roller actuator 125.
The roller actuator 125 has a movable piston end 127 mounted to the separator frame 123 and a fixed end 129 mounted to the rigid frame 106. According to some examples, the roller actuator 125 is a hydraulic actuator or a pneumatic actuator. The force and movement of the roller actuator 125 and the roller linkage 120, relative to the rigid frame 106, is achieved independently of the row-cleaning linkage 112.
A roller actuator 125 is coupled at each end of a respective roller device, such as the first end 116b and the second end 118b of the second roller device 114b illustrated in FIG. 4. Thus, each row unit, such as row units 103a, 103b illustrated in FIG. 4, has at least one respective roller actuator 125.
Referring to FIG. 4, the agricultural system 100 is illustrated having two adjacent row units 103a, 103b, mounted along the tow bar 102 at respective parallel strip positions B and C. Although not illustrated, similar or identical row units can be mounted along the tow bar 102 at strip positions A and D. Each of the row units 103a, 103b includes a respective rigid frame 106 and roller linkage 120. Three roller devices, including the first roller device 114a, the second roller device 114b, and a third roller device are 103c extend from and between respective ones of the row units 103a, 103b. 
For example, the second roller device 114b extends between a first row unit 103a and a second row unit 103b. The first roller device 114a extends between the first row unit 103a and an adjacent row unit that is mounted (but not shown) along the tow bar 102 at the strip position A. The third roller device 103c extends between the second row unit 103b and an adjacent row unit that is mounted (but not shown) along the tow bar 102 at the strip position D. The row units at strip positions A and D are similar and/or identical to the first and second row units 103a, 103b. 
Referring to FIG. 5, the row-cleaning device 104, including the leading coulter 108 and the furrow-opener disk 110, prepares exposed soil in the strip position B for an agricultural operation, such as planting. The roller device 114a crushes, at least in part, the stems of the standing residual plant matter 132 while maintaining the strip A of exposed soil. Alternatively, the roller device 114a is positioned in a forward position relative to the row-cleaning device 104, instead of being in the illustrated positioned rearward relative to the row-cleaning device 104.
Furthermore, as the agricultural system 100 advance in the direction V along the field 130, the row-cleaning device 104 moves up-down independent of the roller device 114a because each is independently attached to and actuated from the rigid frame 106. The roller device 114a moves pivotably and is actuated in response to a supplemental force provided by the roller actuator 125, as described above in reference to FIG. 3. In reference to the row-cleaning device 104, the row-cleaning linkage 112 is similarly pivotably attached to the rigid frame 106 and is actuated in response to a supplemental force provided by the row-cleaning actuator 113. Thus, as the row-cleaning device 104 and the roller device 114a encounter different field irregularities or obstacles, such as rocks, irregular terrain surfaces, and/or other debris, the row-cleaning device 104 and the roller device 114a can be independently adjusted to be positioned at a desired distance from the field irregularity and to apply a desired force to the field irregularity (e.g., a lower force if a rock is encountered, a greater force if hardened soil is encountered, etc.).
The row-cleaning actuator 113 is coupled between the row-cleaning linkage 112 and the rigid frame 106 to provide the desired supplemental force to the respective. The row-cleaning actuator 113, by way of example, is a hydraulic or pneumatic actuator.
One benefit of the agricultural system 100, in which the row-cleaning device 104 is combined with the roller device 114a is directed to preparing in a single pas strips of soil despite the presence of standing residual plant matter 132 in the field 130. Such agricultural actions like separating residual plant matter 132, crushing stems of the residual plant matter 132, and planting seeds in an open furrow of the strips, all occur within the same pass of the agricultural system 100.
Additional benefits of the agricultural system 100 are directed to the crushed residual plant matter 132. For example, the crushed residual plant matter 134 is effectively terminated or destroyed and remains in contact or in close proximity with the surface of the soil, returning nutrients to the soil, such as nitrogen, and thereby reducing the amount of fertilizer that must be subsequently applied to grow the primary crop. In another example, the crushed residual plant matter 132 remains in contact with or in close proximity with the surface of the soil helps maintain moisture in the soil. It has been shown that such increased moisture retention directly results in an increased yield of the primary crop. In yet another example, by virtue of the crushed residual plant matter 132 remaining in contact or in close proximity with the surface of the soil, a toxin is released as a result of which weed growth is substantially diminished without (or reduced) application of herbicides. In yet another example, the presence of residual plant matter 132 or cover crop, by virtue of the root mass of the residual plant matter 132, significantly reduces soil erosion that would otherwise occur without such ground cover after harvest of the primary crop.
Referring to FIG. 6, the agricultural system 100 is configured with single, centrally located roller bearings 140 for roller devices 114a-114d. The roller bearings 140 are centrally located along a central axle 142 within the hollow interior 129 of each roller device 114a-14d. The central axle 142 represents a rotational axis along which the roller devices 114a, 114d rotate, respectively. The roller bearings 140 are mounted to respective supporting brackets 143. As the agricultural system 100 is advanced along the field 130, the row units 103a-103c independently move up-and-down when obstacles, such as a rock 144, are encountered.
For example, the first row unit 103a moves up to advance past the rock 144 when the second roller device 114b encounters the rock 144. The rock 144 causes the second roller device 114b to flex upwards. The second roller device 114b pivots about the central roller bearing 140 and relative to the central axle 142, with the first end 116b moving upwards and the second end 118b moving downwards. The movement of the second roller device 114b causes movement of the first row unit 103a, which, in turn, causes movement of the first roller device 114a. The first roller device 114a, similar to the second roller device 114b, pivots about its central roller bearing and relative to its central axle 142, with the first end 116a moving upwards and the second end 118 a moving downwards. The second and third row units 103b, 103c, and the third and fourth roller devices 114c, 114d remain generally unaffected by the movement of the first row unit 103a and the first and second roller devices 114a, 114b. 
Optionally, instead of a single roller bearing 140, two roller bearings are centrally located along one or more of the roller devices 114a-114d. Each of the two roller bearings is mounted on a respective, opposite side of the supporting bracket 143.
Referring to FIG. 7, the agricultural system 100 illustrated in FIG. 6 is alternatively configured with two roller bearings 140 at respective ends of the roller devices 114a-114d. Thus, instead of a single, centrally located, roller bearing 140, two side roller bearings 140 are provided for each of the roller devices 114a-114d. Each of the side roller bearing 140 is mounted along the central axle 142 to a supporting bracket 143. Optionally, for increased flexibility in pivoting movement, two side roller bearings 140 are mounted at each end of one or more of the roller devices 114a-114d. 
Referring to FIG. 8, an agricultural system 200 includes a row unit 201 with a leading residue-clearing sub-assembly 202 followed by a trailing tillage and depth-control sub-assembly 204. Both sub-assemblies 202, 204 are carried by a common frame 206 attached to a rear end of a four-bar linkage assembly 208, which, in turn, is attached to a front frame 210. The front frame 210 is adapted to be connected to the tow bar 102 of a towing vehicle. The agricultural system 200 is movable in a direction V along the field 130. Because both sub-assemblies 202, 204 are carried by the same frame 206, the relative relationship of all the components of the two sub-assemblies 202, 204 remains fixed so that they maintain a consistent set of dynamic properties governed by their relative sizes and positions rather than just the individual properties of the individual components.
The residue-clearing sub-assembly 202 includes a forward coulter wheel 220 flanked by a pair of toothed wheels 222, 223 overlapping a rear edge portion of the forward coulter wheel 220. Thus, the residue-clearing sub-assembly 202 is similar, but necessarily identical, to the row-cleaning device 104. The forward coulter wheel 220 cuts through the residue on the soil, such as stalks from a previous year's planting, and cuts a shallow slit in the soil. The trailing toothed residue-clearing wheels 222, 223 then kick the cut residue off to opposite sides of the slit cut by the forward coulter wheel 220, thus clearing a row for planting (e.g., strip rows A-C illustrated in FIG. 1), while at the same time cleaning the forward coulter wheel 220. To this end, the front edges of the toothed wheels 222, 223 are tilted inwardly toward the vertical plane of the forward coulter wheel 220 to assist in cleaning the forward coulter wheel 220, and the lower edges are tilted outwardly to assist in cleaning the row to be planted. This arrangement is particularly well suited for strip tilling, where the strip cleared for planting is typically only about 10 inches of the 30-inch center-to-center spacing between planted rows.
The tillage and depth-control sub-assembly 204 includes a pair of rearward coulter wheels 230, 231 that are offset from each other both laterally and fore and aft, and two gauge wheels 232, 233. The rear edges of the rearward coulter wheels 230, 231 are tilted inwardly toward the slit cut by the forward coulter wheel 220, and the lower edges of the rearward coulter wheels 230, 213 are tilted outwardly away from the slit. Thus, each of the rearward coulter wheels 230, 231 makes contact with the soil at an angle in two planes, causing each of the rearward coulter wheels 230, 231 to apply a force to the soil that is upward and toward the center of the row. The aggregate effect of this angular relationship on the soil is a turbulent swirling and mixing of the soil in the space between the two rearward coulter wheels 230, 231. The turbulent swirling and mixing of the soil incorporates air and residue into the soil, and, further, breaks the soil into finer pieces. Soil thrown laterally by the leading coulter wheel 230 is caught by the trailing coulter wheel 231 to retain that soil in the tilled area between the two rearward coulter wheels 230, 231 and to form a ridge for planting.
The gauge wheels 232, 233 control the depth to which the row unit 201 penetrates into the soil, and also intercept soil and residue thrown upwardly and laterally by the trailing coulter wheel 231, to retain that soil in the strip being tilled. This prevents soil loss form the tilled area and facilitates the creation of the ridge, or berm, which is desirable for planting. Because the height of the axes of rotation of all the wheels 220, 222, 223, 230, 231 is fixed relative to the height of the axes of rotation of the gauge wheels 232, 233, the interaction among all the wheels remains essentially the same at all times. Alternatively, instead of gauge wheels, the row unit 201 includes small-belted caterpillar tracks or similar devices for controlling the depth.
Each of the gauge wheels 232, 233 includes a swirl device 240 having multiple tines 242 and being attached to a central portion of the inboard side of each respective gauge wheel 232, 233. As such, the swirl device 240 is located rearwardly of the of the tillage device (e.g., rearward coulter wheels 230, 231) and is positioned to intercept soil and residue displaced upwardly by the tillage device. The swirl device 240 rotates with the respective gauge wheel 232, 233 and helps to control the distribution of soil moving toward the respective gauge wheel 232, 233 from the rearmost of the coulter wheels 220, 230, 231.
The swirl device 240 intercepts a portion of the soil and residue thrown upwardly and laterally towards the gauge wheels 232, 233 by the trailing coulter wheel 231 and distributes the intercepted soil and residue across the tilled strip adjacent the gauge wheels 232, 233. The swirl device 240 also helps to break up clumpy soil. Because the outside diameter of the swirl device 240 is smaller than the outside diameter of the gauge wheels 232, 233, the swirl device 240 operates above ground level and does not dig into the earth. Another benefit of the swirl device 240 is that it produces thorough incorporation of fertilizer, especially dry fertilizer, with the soil within the worked strip where it is needed by the plants, rather than leaving the fertilizer in concentrated ribbons. This allows the application of more fertilizer in the strip, possibly just ahead of the planter by a few hours, without burning the seed, and may eliminate a second trip to side dress. The total amount of fertilizer applied to produce optimum crop yields may even be reduced. Fertilizer that is not thoroughly incorporated in the soil may be lost to the atmosphere or runoff, which is costly and may pollute both ground water and surface water.
In the embodiment described above, all the coulter wheels 220, 230, 231 are corrugated or fluted coulter wheels, but a wide variety of different coulter wheels are well known in the agricultural industry, and any of them may be used. The same is true of the toothed residue-clearing wheels 222, 223—a wide variety of different configurations of toothed wheels are well known in the agricultural industry for residue clearing, and any of them may be used.
The illustrative row unit 201 is urged downwardly against the soil by its own weight. If it is desired to have the ability to increase this downward force, or to be able to adjust the force, a hydraulic or pneumatic cylinder and/or one or more springs may be added between the common frame 206 and the four-bar linkage assembly 208, or between the common frame 206 and the front frame 210, to urge the common frame 206 downwardly with a controllable force. Such a hydraulic cylinder may also be used to lift the row unit off the ground for transport by a heavier, stronger, fixed-height frame that is also used to transport large quantities of fertilizer for application via multiple residue-clearing and tillage row units.
The agricultural system 200 further includes a roller device 250 that is mounted for crushing residual plant matter. The configuration and/or attachment of the roller device 250 is similar to and/or identical to the roller devices 114a-114d described above in reference to FIGS. 1-7. In the illustrated embodiment of FIG. 8, the roller device 250 is in a trailing position relative to the forward coulter wheel 220. However, in alternative embodiments the roller device 250 is positioned in other desired positions relative to the forward coulter wheel 220.
Referring to FIGS. 9 and 10, the agricultural system 200 includes two roller devices 250a, 250b extending in-between three row units 201a-201c. As the agricultural system 200 is advanced in direction V along the field 103, the roller devices 250a, 250b level standing residual plant matter 132 into crushed residual plant matter 134. Simultaneously, the row units 201a-201c prepare strips of soil A-C in preparation for planting or other farming operation.
In alternative embodiments one or more of the wheels described above are forged blades with an induction hardened edge. The forged blades are beneficial because they are ductile and, as such, are not prone to shatter. Furthermore, in addition to being resisting to shattering, the forged blades maintain a hardened edge. In a further optional embodiment, one or more of the coulters described above is made of cast iron and includes a beveled edge.
In other alternative embodiments, various hydraulic configurations are included in one or more of the agricultural systems 100, 200. For example, hydraulic cylinders are mounted to any movable components of the agricultural systems 100, 200 in which a controllable down/up pressure is desired for maintaining a required component-to-ground pressure.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrated embodiment and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

## Claims

1. An agricultural system comprising:
a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field;
a plurality of row-cleaning devices attached in parallel strip positions along the tow bar, each row-cleaning device of the plurality of row-cleaning devices including
a rigid frame for attachment to the tow bar,
a leading coulter,
one or more furrow-opener disks in a trailing position relative to the leading coulter, each of the one or more furrow-opener disks having a leading edge adjacent to a trailing edge of the leading coulter, and
a pivotable row-cleaning linkage attached to the rigid frame, the leading coulter and the furrow-opener disks being coupled to the rigid frame via the pivotable row-cleaning linkage; and

at least one roller device extending between two adjacent parallel strip positions and being attached at each end to a respective rigid frame via a respective pivotable roller linkage, the pivotable roller linkage being independently movable relative to the pivotable row-cleaning linkage.

2. The agricultural system of claim 1, wherein the at least one roller device is in a leading position relative to the plurality of row-cleaning devices.

3. The agricultural system of claim 1, wherein the at least one roller device is in a trailing position relative to the plurality of row-cleaning devices.

4. The agricultural system of claim 1, wherein at least one of the leading coulter and the one or more furrow-opener disks is a forged blade with an induction hardened edge.

5. The agricultural system of claim 1, further comprising an actuator coupled between the pivotable row-cleaning linkage and the rigid frame, the actuator applying a force to the row-cleaning device.

6. The agricultural system of claim 5, wherein the actuator is a hydraulic actuator and the force is a controllable down-force.

7. The agricultural system of claim 1, further comprising an actuator coupled at each end of the roller device, between the respective rigid frame and the respective pivotable roller linkage, the actuator applying a force to a respective end of the roller device.

8. The agricultural system of claim 7, wherein the actuator is a hydraulic actuator and the force is a controllable down-force.

9. The agricultural system of claim 1, wherein the leading edge of the one or more furrow-opener disks is overlapping with the trailing edge of the leading coulter.

10. The agricultural system of claim 1, wherein the one or more furrow-opener disks includes two furrow-opener disks with respective leading edges adjacent to each other near the trailing edge of the leading coulter, the leading coulter being positioned such that the leading edges of the two furrow-opener disks are obscured by the trailing edge of the leading coulter from a front farming position, the front farming position being forward of the row-cleaning device along the direction of movement along the field.

11. An agricultural system comprising:
a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field;
a plurality of row-cleaning devices attached in parallel strip positions along the tow bar, the plurality of row-cleaning devices including a first row-cleaning device and a second row-cleaning device,
the first row-cleaning device being attached in a first strip position and including
a first rigid frame for attachment to the tow bar,
a first leading coulter,
one or more first furrow-opener disks in a trailing position relative to the first leading coulter, and
a first pivotable row-cleaning linkage attached to the first rigid frame, the first leading coulter and the first furrow-opener disks being coupled to the first rigid frame via the first pivotable row-cleaning linkage;

the second row-cleaning device being attached in a second strip position, the second strip position being adjacent and parallel to the first strip position, the second row-cleaning device including
a second rigid frame for attachment to the tow bar,
a second leading coulter,
one or more second furrow-opener disks in a trailing position relative to the second leading coulter, and
a second pivotable row-cleaning linkage attached to the second rigid frame, the second leading coulter and the second furrow-opener disks being coupled to the second rigid frame via the second pivotable row-cleaning linkage; and

a roller device attached between the first row-cleaning device and the second row-cleaning device, the roller device including
a first pivotable roller linkage attached at a first end of the roller device and being independently movable from the first rigid frame,
a second pivotable roller linkage attached at a second end of the roller device and being independently movable from the second rigid frame, and
at least one roller bearing mounted along a rotational axis of the roller device.

12. The agricultural system of claim 11, wherein the at least one roller bearing is a single roller bearing mounted at a central location between the first strip position and the second strip position.

13. The agricultural system of claim 11, wherein the at least one roller bearing includes a first roller bearing and a second roller bearing, the first roller bearing being mounted near the first end of the roller device, the second roller bearing being mounted near the second end of the roller device.

14. The agricultural system of claim 11, wherein the roller device is in a leading position relative to the plurality of row-cleaning devices.

15. The agricultural system of claim 11, wherein the roller device is in a trailing position relative to the plurality of row-cleaning devices.

16. The agricultural system of claim 11, further comprising an actuator coupled mounted to at least one of the plurality of row-cleaning devices, the actuator applying a force to a respective row-cleaning device of the plurality of row-cleaning devices.

17. The agricultural system of claim 16, wherein the actuator is a hydraulic actuator and the force is a controllable down-force.

18. The agricultural system of claim 11, further comprising:
a first actuator coupled at the first end of the roller device between the first rigid frame and the first pivotable roller linkage, the first actuator applying a first force to the first end of the roller device; and
a second actuator coupled at the second end of the roller device between the second rigid frame and the second pivotable roller linkage, the second actuator applying a second force to the second end of the roller device.

19. The agricultural system of claim 18, wherein at least one of the first actuator and the second actuator is a hydraulic actuator applying a controllable down-force.

20. The agricultural system of claim 11, wherein at least one of the first leading coulter, the one or more first furrow-opener disks, the second leading coulter, and the one or more second furrow-opener is a forged blade with an induction hardened edge.