ROW UNIT FOR AN AGRICULTURAL SEEDING MACHINE AND METHOD FOR DETERMINING A PLACEMENT DEPTH AND / OR COVERAGE HEIGHT

Description

[0001] The invention relates to a row unit for an agricultural seed drill for depositing material onto an agricultural area according to the preamble of claim 1, an agricultural seed drill according to the preamble of claim 7 and a method for determining a depositing depth and / or covering height of material deposited onto an agricultural area by means of a row unit of an agricultural seed drill according to the preamble of claim 8.

[0002] In the field of agriculture, a wide variety of seed drills are known for spreading or depositing material, especially seeds and / or fertilizer. These include pneumatic and / or mechanical seed drills, as well as precision seed drills, which are equipped with at least one row unit or seeding unit to deposit the material onto agricultural land.

[0003] A row unit of this type is known, for example, from publication EP3704 926 A1. According to this publication, the row unit comprises at least one furrow opening element, in particular a share, which is designed to open a seed furrow. Furthermore, the row unit comprises at least one material delivery device, which is designed to supply the material to be distributed as needed and to deposit the material within the seed furrow. In addition, the row unit has at least one depth control element, which is designed to set a defined depositing depth and / or coverage height for the material and / or a defined penetration depth of the furrow opening element into the soil of the field.In addition, the row unit has at least one associated electronic evaluation device, which comprises several sensors assigned to the row unit. These sensors are configured to scan the working area, in particular the seed furrow and / or the soil of the working area, without contact, within a detection range assigned to the respective sensors. The evaluation device is configured to determine the deposition depth and / or coverage height of the material deposited in the seed furrow and / or the penetration depth of the furrow opening element based on the sensor data. For this purpose, the evaluation device is specifically configured to process and / or consider individual sensor signals from the multiple sensors to determine the deposition depth and / or coverage height.

[0004] A disadvantage of row units designed in this way is that at least one of the several sensors, in particular detection areas, is arranged and / or located in front of the at least one depth control element in the direction of travel and / or work. In particular, it is a disadvantage that the placement depth and / or coverage height is determined by sensors, of which, in particular, only one of the several sensors is arranged and / or located behind and / or in front of the depth control element. Soil movements of the working area, which depend on the soil conditions, a contact force of the at least one depth control element (coulter pressure of the row unit), and / or due to the furrow opening element, can only be inadequately detected and / or taken into account with sensors, in particular detection areas, arranged in this way.

[0005] Furthermore, a series unit is known from publication US 2019 / 254223 A1, in which the detection area of ​​the several sensors is arranged and / or located behind a contact surface of the at least one depth control element during the placement of the distributed material and in the direction of travel and / or work.

[0006] However, the placement accuracy and / or quality of the spread material could be further improved in a simple manner if such soil movements or compaction of the arable land were detected and / or taken into account with greater precision. The object underlying the invention is therefore to further increase the precision of sensor-based detection of the placement depth and / or coverage height of the spread material.

[0007] This problem is solved according to the invention by the characterizing features of claim 1.

[0008] As a result of this measure, the area of ​​the usable surface or soil located behind the at least one depth control element can be detected simultaneously by several sensors. These multiple sensors preferably each detect different areas of the soil. Alternatively or additionally, the sensors can be arranged and / or oriented such that the detection areas overlap at least partially. The different detection areas can be offset from each other in and / or perpendicular to the direction of travel and / or work. Furthermore, the row unit can also be assigned at least one additional sensor, which is configured to detect the usable surface or soil in the direction of travel and / or work in front of the at least one depth control element.Furthermore, the evaluation device is preferably additionally configured to take into account geometric and / or positional information of the row unit for determining the deposition depth and / or coverage height. In particular, this allows the respective sensor position and / or sensor orientation relative to the ground (e.g., sensor distance to the ground) to be considered. The evaluation device is preferably also configured to take into account the individual sensor signals of the multiple sensors for determining the deposition depth and / or coverage height of the material being spread and / or for determining the penetration depth of the furrow opening element. Such an embodiment has the decisive advantage that the area and / or several different areas behind the at least one depth control element can be detected by multiple sensors, thereby further increasing the precision of the deposition depth and / or coverage height detection of the material being spread.

[0009] The row unit preferably comprises several depth control elements, each assigned to one or more furrow opening elements. The depth control elements are preferably designed in the form of support rollers or depth control rollers, or the like. Particularly preferably, at least one of the depth control elements is arranged to the left of the furrow opening element, in particular the seed furrow, when viewed in the direction of travel, and at least one other depth control element is arranged to the right of the furrow opening element.

[0010] The at least one furrow opening element is preferably designed in the manner of a share, in particular a chisel or tine share or a disc share. However, the row unit particularly preferably comprises several furrow opening elements, which preferably form a double disc share.

[0011] The multiple sensors can be of the optical and / or acoustic type. In particular, sensors of the ultrasonic, radar, lidar, and / or laser type are envisaged. Camera-based or image-capturing sensors are also conceivable. Alternatively or additionally, it is also possible to combine differently designed sensors.

[0012] In a preferred embodiment of the row unit according to the invention, the multiple sensors are arranged behind the contact surface, in particular a pivot axis, of the at least one depth control element in the direction of travel and / or operation of the row unit. The contact surface here particularly forms the area of ​​the ground over which the at least one depth control element is supported on the ground and / or over which the weight and / or coulter pressure of the row unit is at least substantially transferred to the ground. With multiple depth control elements, each depth control element has its own contact surface. The depth control elements are preferably designed in the manner of depth control rollers, which are rotatably arranged about an axis or pivot axis located transversely to the direction of travel and / or operation.In such an embodiment, the sensors are arranged particularly close to the intended detection areas, making it possible to detect the area behind the at least one depth control element with particularly high precision and / or without obstruction.

[0013] In the series unit according to the invention, the detection range of at least one of the several sensors is at least partially directed towards an area of ​​the ground pressed against it by at least one depth control element, preferably a track of the depth control element. At least one of the sensors is configured to detect the track of the at least one depth control element, in particular the depth of the track. The track is a strip on the ground of the usable area traversed or formed by the at least one depth control element, which is directly pressed against and / or compacted by the depth control element. When several depth control elements are used, each of the depth control elements forms its own track on the ground.

[0014] Furthermore, in the inventive series unit, the detection area of ​​at least one of the several sensors is at least partially aligned with the open seed furrow. The at least one sensor is configured to detect the depth and / or contour of the seed furrow.

[0015] In a further development of the series unit, the detection range of a first of the several sensors is directed towards the area of ​​the soil pressed against it by the at least one depth control element, preferably the track, and of a second of the several sensors towards the opened seed furrow. In other words, the several sensors are preferably arranged such that at least one of the sensors is configured to detect the track of the at least one depth control element, while at least one other of the several sensors is configured to detect the seed furrow opened and / or formed by the furrow opening element. In particular, it is provided that the evaluation device is configured to take into account or calculate the depth and / or contour of the track and the seed furrow to determine the placement depth, coverage height, and / or penetration depth.In such an embodiment, the evaluation device takes into account different elevation levels and / or soil layers of the usable area, thereby further improving the accuracy in determining the deposit depth, coverage height and / or penetration depth.

[0016] In the series unit according to the invention, the detection area of ​​one of the several sensors is aligned on the area of ​​the ground pressed against it by the at least one depth control element, preferably the track of the depth control element, on the one hand, and the open seed furrow on the other. Thus, the at least one sensor is configured to detect both the depth and / or contour of the seed furrow and the track of the depth control element. Alternatively or additionally, when using several depth control elements, it can be provided that at least one of the sensors is configured to detect the seed furrow and the track of one depth control element, while the at least one other sensor is configured to detect the seed furrow and the track of the other depth control element.

[0017] Furthermore, it is preferably possible for the evaluation device to be configured to generate individual mean values ​​based on the distances to the ground detected by the sensors and to take these into account when determining the deposition depth and / or cover height. Alternatively or additionally, it would also be conceivable for the evaluation device to be configured to determine mean values ​​for the deposition depth and / or cover height based on the sensor signals.

[0018] In In another preferred embodiment of the inventive series unit, the sensors, preferably the detection areas of the sensors, are offset from each other transversely to the direction of travel and / or operation of the series unit.

[0019] The row unit further preferably comprises at least one furrow closing and / or pressing element, which is arranged behind the furrow opening element in the direction of travel and / or working, preferably spaced apart. The furrow closing and / or pressing element is designed to at least partially close and / or press down the seed furrow after the material being distributed has been deposited.

[0020] In a preferred embodiment of the inventive row unit, the detection area of ​​one of the several sensors is arranged behind and the detection area of ​​at least one other of the several sensors is arranged in front of the furrow closing and / or pressure element. The at least one furrow closing and / or pressure element is preferably designed in the manner of a reflection and / or pressure roller. The row unit preferably comprises several furrow closing and / or pressure elements, which are particularly preferably positioned relative to one another and / or angled. With sensors arranged in this way, the evaluation device is configured to take into account the soil additionally thrown and / or compacted onto the seed furrow by the furrow closing and / or pressure element.

[0021] Furthermore, a series unit according to the invention is preferred in which at least one of the several sensors is arranged and configured to detect the material being distributed, which is at least partially pressed into the seed furrow by a catching and / or pressing roller arranged behind the furrow opening element and / or the depth control element. The evaluation device is preferably configured to take the detected and / or pressed material into account when determining the deposit depth and / or coverage height. Particularly preferred is the evaluation device configured, based on the detected pressed material, to determine the height and / or the proportion to which the material is pressed into the seed furrow. This embodiment exhibits particularly high precision in determining the deposit depth and / or coverage height of the material being distributed.

[0022] In another preferred embodiment of the row unit according to the invention, the evaluation device is configured to check the plausibility of the detected and / or determined placement depth and / or coverage height, or of the sensor signals, based on predefinable operating parameters. The evaluation device is preferably configured to consider and / or filter sensor signals generated by the sensors depending on their plausibility, particularly the operating parameters. Operating parameters here include, in particular, a predefinable and / or measurable coulter pressure and / or a predefinable and / or measurable ground force of the row unit. Alternatively or additionally, the operating parameter can also take into account the condition of the working area, for example, the temperature and / or moisture of the soil.

[0023] Furthermore, it can preferably also be provided that the evaluation device is configured to consider or calculate the sensor signal of each of the sensors in different ways and depending on its plausibility. For a sensor that is configured to detect both the seed furrow and the walking track, either the distance to the seed furrow or to the walking track can thus be considered, depending on plausibility.

[0024] The evaluation device can further be configured to check the plausibility once or repeatedly within a predefined and / or adjustable period during the work process. Alternatively, the evaluation device can also be configured to check the plausibility continuously or throughout the entire work process. The evaluation device is preferably configured to consider the sensor signals with different weightings depending on their plausibility, particularly the operating parameters, to determine the deposit depth and / or coverage height. The evaluation device is particularly preferably configured to consider different sensor signals depending on their plausibility, particularly the operating parameters, to determine the deposit depth and / or coverage height.For example, it may be provided that, in the case of positive plausibility, a sensor signal assigned to the detection of the seed furrow is considered by the evaluation device, and in the case of negative plausibility, a sensor signal assigned to the detection of the running track (or vice versa). Furthermore, a (calculated) expected seed placement depth and / or coverage height, dependent on the operating parameters, may be provided, which is considered during the plausibility check and / or, in particular, compared with the seed placement depth and / or coverage height determined from the sensor signals. Finally, it may be provided that, in the case of negative plausibility, a corrected seed placement depth and / or coverage height is determined by the evaluation device.

[0025] The problem underlying the invention is also solved with an agricultural seed drill having one or more row units for depositing material, wherein the one or more row units are designed according to at least one of the embodiments of the row unit according to the invention described above. Therefore, with regard to the advantages and modifications of the seed drill according to the invention, reference is first made to the advantages and modifications of the row unit according to the invention.

[0026] The agricultural seed drill is preferably designed in the style of a single-seed drill and is intended for depositing seeds and / or fertilizer.

[0027] The problem underlying the invention is further solved by a method for determining the sowing depth and / or covering height of material deposited on agricultural land by means of a row unit of an agricultural seed drill, wherein the row unit is designed according to one of the embodiments described above. With regard to the advantages and modifications of the method according to the invention for determining a sowing depth and / or covering height, reference is therefore first made to the advantages and modifications of the row unit according to the invention.

[0028] In the method according to the invention, a seed furrow is opened along the working area by means of at least one furrow opening element, in particular a share, assigned to the row unit. Furthermore, the material to be distributed is supplied and / or deposited within the seed furrow by means of at least one material delivery device assigned to the row unit. During this process, a defined depositing depth and / or coverage height for the material to be distributed and / or a defined penetration depth of the furrow opening element into the soil of the working area is set by means of at least one depth control element assigned to the row unit. Furthermore, a depositing depth and / or coverage height of the material deposited in the seed furrow is determined and / or recorded by means of at least one evaluation device assigned to the row unit.For this purpose, the evaluation device comprises several sensors which scan the usable area, preferably the seed furrow and / or the floor of the usable area, without contact, within a detection range assigned to the respective sensors during the placement of the material being distributed.

[0029] In a particularly preferred embodiment of the method according to the invention, the usable area, in particular the seed furrow and / or the bottom of the usable area, behind the contact surface of the at least one depth control element is detected and / or scanned by means of the sensors, in particular the detection range of the sensors.

[0030] Further details of the invention can be found in the description of the example and the drawings. The drawings show Fig. 1 shows an agricultural seed drill, designed as a single-seed drill and attached behind a tractor, with a plurality of row units according to the invention in a perspective view; Fig. 2 shows a row unit according to the invention in a perspective single view; and Fig. 3 shows the row unit according to the invention in a sectional view from the rear.

[0031] An agricultural seed drill 10, attached behind a tractor 1 and designed as a single-seed drill, is in Fig. 1 The single-seed drill 10 has a plurality of seeding units arranged transversely to the direction of travel F on a beam 2, each designed in the manner of agricultural row units 20 and intended for depositing material on an agricultural area.

[0032] As in the Fig. 2As can be seen particularly well, the row units 20 each have a container 21 on their upper side for holding the material to be distributed, in this case seed. From the container 21, the material being distributed, in the form of seed, passes into a singulation element of a material depositing device 22 (not shown in detail), from which it is conveyed as needed and / or at regular intervals to the ground B of the cultivation area and deposited in a seed furrow 230 formed or opened by several furrow opening elements 23 (only partially shown here). The furrow opening elements 23 can be designed in the manner of double-disc coulters known per se. Alternatively, the row unit 20 can also comprise only one furrow opening element 23, which is designed, for example, in the manner of a chisel or tine coulter.Furthermore, a combination of different furrow opening elements, for example at least one disc coulter with a tine coulter or the like, would also be conceivable. The furrow opening elements 23 serve to open a seed furrow 230 in the soil B, into which individual seed grains K of the material to be spread are deposited.

[0033] Furthermore, the row unit 20 comprises several depth control elements 24A, 24B, designed here in the manner of depth control and / or support rollers, which are intended for setting a defined depositing depth and / or covering height for the material being spread and / or a defined penetration depth of the furrow opening elements 23 into the soil B of the working area. As an alternative to the illustrated embodiment, a row unit 20 with only one depth control element 24A, 24B would also be conceivable. The depth control elements 24A, 24B are rotatably arranged within the row unit 20 about a pivot axis D and each rests on the soil B via a bearing surface AA, AB. The weight and / or an adjustable coulter pressure of the row unit 20 are transmitted to the soil B via the respective bearing surfaces AA, AB.

[0034] Furthermore, an electronic evaluation device 200 is assigned to the row unit 20, which comprises several sensors 30A, 30B, 31 assigned to the row unit 20. The sensors 30A, 30B, 31 are arranged on the row unit 20 and are configured to scan the usable area, in particular the seed furrow 230 and / or the ground B of the usable area, without contact, within a detection range 300A, 300B, 310 assigned to the respective sensors 30A, 30B, 31. The sensors 30A, 30B, 31 are arranged according to the invention such that the detection area 300A, 300B, 310 of the multiple sensors 30A, 30B, 31 is located behind the contact surface AA, AB of the depth control elements 24A, 24B during the placement of the distributed material and in the direction of travel and / or work F of the row unit 20.Furthermore, the evaluation device 200 is designed to determine the deposit depth and / or coverage height of the material placed in the seed furrow 230 and / or the penetration depth of the furrow opening element 23 on the basis of the sensors 30A, 30B, 31 or the detected and / or scanned soil B of the usable area.

[0035] As in the Fig. 2 As can be seen in particular, the several sensors 30A, 30B, 31 are arranged in the direction of travel and / or work F of the row unit 20 behind the contact surface AA, AB, in particular a rotation axis D, of the depth control elements 24A, 24B.

[0036] As in the Fig. 3As can be seen more clearly, the detection area 300A, 300B of the first and second of the several sensors 30A, 30B is at least partially aligned with an area of ​​the ground B pressed against it by the depth control elements 24A, 24B, in particular a track SA, SB of the depth control elements 24A, 24B. The sensors 30A, 30B, in particular the detection areas 300A, 300B of the sensors 30A, 30B, are offset from each other transversely to the direction of travel and / or work F of the row unit 20 such that during the work process, the first sensor 30A detects and / or scans the track SA of the depth control element 24A on the right as viewed in the direction of travel F, and the second sensor 30B detects and / or scans the track SB of the depth control element 24B on the left as viewed in the direction of travel F.

[0037] As can also be seen, the second sensor 30B, or rather its detection range 300B, is arranged and / or aligned in such a way that the open seed furrow 230 is at least partially detected and / or scanned by the second sensor 30B during the operation. The second sensor 30B is thus configured to detect at least part of the depth and / or contour of the seed furrow 230.

[0038] In other words, the detection area 300A of the first sensor 30A is directed towards at least one area of ​​the soil B pressed against it by the depth control elements 24A, 24B, in particular the track SA, SB, while the detection area 300B of the second sensor 30B is directed towards the open seed furrow 230. According to the invention, the second sensor 30B, or rather its detection area 300B, is further arranged such that it additionally detects and / or scans the pressed-up area of ​​the soil B, in particular the track SB of the other depth control element 24B.

[0039] Based on the Fig. 2 and 3An optional catching and / or pressing roller 25 is also visible, which is arranged in the direction of travel and / or working F, in particular directly behind the furrow opening element 23 and / or the depth control elements 24A, 24B. The catching and / or pressing roller 25 is designed to press and / or sink seed grains K of the distribution material, which are supplied and / or deposited by the material delivery device 22, at least partially into the soil of the seed furrow 230. The evaluation device 200 is designed to take into account the pressed-in distribution material detected by the sensors 30B when determining the placement depth and / or coverage height. In particular, the evaluation device 200 is designed to determine and take into account the height and / or the proportion to which the distribution material or the seed grains K are pressed into the seed furrow 230.

[0040] The Fig. 2Figure 26 also shows furrow closing and / or pressing elements 26, arranged in the direction of travel and / or work F, in particular spaced apart, behind the furrow opening element 23. These elements are designed here as furrow closing and / or pressing rollers, which are arranged in a V-shape relative to each other. The furrow closing and / or pressing elements 26 are designed to at least partially close and / or press down the seed furrow 230 after the material has been deposited. It should be explicitly mentioned that the row unit 20 can alternatively also have a single furrow closing and / or pressing element 26, which is intended for closing and / or pressing down the seed furrow 230.

[0041] Furthermore, an optional additional sensor 31 can be seen, which is arranged on the row unit 20 via an optional holding device 27.

[0042] The detection area 310 of the optional additional sensor 31 is located and / or aligned behind the groove sealing and / or pressure elements 26, while the detection area 300A, 300B of at least one other sensor 30A, 30B, here the first and / or second sensor 30A, 30B, is located and / or aligned in front of the groove sealing and / or pressure elements 26. Alternatively or additionally, it would also be conceivable that the detection area 300A, 300B of the first or second sensor 30A, 30B is aligned with the area behind the groove sealing and / or pressure elements 26.

[0043] Furthermore, it should be mentioned that the evaluation device 200 is optionally configured to check the plausibility of the detected and / or determined storage depth and / or coverage height, or the sensor signals, based on predefined operating parameters. In particular, the evaluation device 200 is configured to consider and / or filter sensor signals generated by sensors 30A, 30B, and 31 depending on their plausibility, especially the operating parameters.

[0044] Furthermore, the evaluation device 200 can alternatively or additionally be set up to take the sensor signals into account with different weightings depending on the plausibility and / or operating parameters in order to determine the deposit depth and / or coverage height.

[0045] For example, the evaluation device 200 can monitor the operating parameters, e.g., the coulter pressure, and compare them with the sensor signals and / or the specified placement depth and / or coverage height. For example, an electronic characteristic map, an electronic function, or the like can also be predefined, which assigns defined target placement depths or target sensor signals to the respective operating parameters, e.g., coulter pressure. Depending on plausibility, e.g., in the case of negative plausibility, the evaluation device 200 can be configured to weight one or more of the multiple sensors 30A, 30B, 31 differently, at least temporarily, or to ignore or disregard them. For example, in the case of negative plausibility, the evaluation device 200 can be configured to determine the placement depth and / or coverage height, at least temporarily, based on only one of the sensors 30A, 30B, 31.

[0046] Furthermore, the evaluation device 200 can also be configured to consider or process the sensor signal of a single sensor 30A, 30B, 31 in different ways, depending on its plausibility. For example, it can be provided that, based on the sensor signal of the second sensor 30B, which is aligned with both the track SB of the depth control element 24B and the seed furrow 230, the distance to the bottom of the seed furrow 230 is used primarily (i.e., if plausible) and secondarily (i.e., if plausible) the distance to the bottom of the track SB is used to determine the seeding depth and / or coverage height. Of course, the evaluation can also be performed in reverse. Furthermore, such filtering of the sensor signals would also be conceivable for the other of the multiple sensors 30A, 31, either alternatively or additionally.

[0047] At least one operating parameter could be, for example, a coulter pressure adjustable on the row unit 20, which can be preset, retrieved, and / or measured. Alternatively or additionally, the operating parameter could also be an environmental condition, such as the nature of the working area, e.g., soil temperature and / or moisture. Furthermore, measurable loads and / or forces on the row unit 20, in particular on the depth control elements 24A, 24B, or the furrow opening elements 23, would also be conceivable as operating parameters.

[0048] It is understood that the features mentioned in the previously described embodiments are not limited to these specific combinations and are also possible in any other combinations, the scope of protection being defined by the attached claims. Furthermore, it is understood that the geometries shown in the figures are only exemplary and are also possible in any other embodiments. Reference symbol list

[0049] 1Agricultural tractor 2Bar 10Single seed drill 20Row unit 200Evaluation device 21Container 22Material storage device 23 Furrow opening element 230 Seed furrow 24A, 24B Depth control elements 25 Catch and / or pressure roller 26 Furrow closing and / or pressure element 27 Holding device 30A First sensor 300A Detection range first sensor 30B Second sensor 300B Detection range second sensor 31 Additional sensor 310 Detection range additional sensor AA, AB Contact surfaces B Soil D Axis of rotation F Direction of travel K Seeds SA, SBL Tracks

Claims

1. Row unit (20) for an agricultural seed drill (10) for depositing distribution material onto agricultural land, comprising; - at least one furrow opening element (23), in particular a share, which is provided for opening a seed furrow (230); - at least one material depositing device (22), which is provided for supplying the distribution material as required and for depositing the distribution material within the seed furrow (230); - at least one depth guidance element (24A, 24B), which is provided for setting a defined deposition depth and / or coverage height for the distribution material and / or a defined penetration depth of the furrow opening element (23) into the soil (B) of the land; and - at least one assigned electronic evaluation device (200), which comprises a plurality of sensors (30A, 30B, 31) assigned to the row unit (20), the sensors (30A, 30B, 31) being configured to contactlessly scan the land, preferably the seed furrow (230) and / or the soil (B) of the land, within a detection range (300A, 300B, 310) assigned to the respective sensors (30A, 30B, 31), and the evaluation device (200) being configured to determine the deposition depth and / or coverage height of the distribution material deposited in the seed furrow (230) and / or the penetration depth of the furrow opening element (23) on the basis of the sensors (30A, 30B, 31); the sensors (30A, 30B, 31) being arranged such that, during the deposition of the distribution material and in the direction of travel and / or work (F) of the row unit (20), the detection range (300A, 300B, 310) of the plurality of sensors (30A, 30B, 31) is arranged and / or located behind a contact area (AA, AB) of the at least one depth guidance element (24A, 24B), characterized in that the detection range (300A, 300B, 310) of one of the plurality of sensors (30A, 30B, 31) is aligned on the one hand with the region of the soil (B) being pressed against by the at least one depth guidance element (24A, 24B), preferably the track line (SA, SB) of the depth guidance element (24A, 24B), and the opened seed furrow (230) on the other.

2. Row unit (20) according to claim 1, characterized in that the plurality of sensors (30A, 30B, 31), in the direction of travel and / or work (F) of the row unit (20), are arranged behind the contact area (AA, AB), in particular behind a rotation axis (D), of the at least one depth guidance element (24A, 24B).

3. Row unit (20) according to claim 1 or 2, characterized in that the sensors (30A, 30B, 31), preferably the detection ranges (300A, 300B, 310) of the sensors (30A, 30B, 31), are offset from each other transversely to the direction of travel and / or work (F) of the row unit (20).

4. Row unit (20) according to at least one of the preceding claims, comprising at least one furrow closing and / or pressing element (26), which, in the direction of travel and / or work (F), is arranged behind the furrow opening element (23), preferably distanced therefrom, and is configured to at least partially close and / or press the seed furrow (230) after the distribution material has been deposited, characterized in that the detection range (300A, 300B, 310) of one of the plurality of sensors (30A, 30B, 31) is arranged or located behind the furrow closing and / or pressing element (26), and the detection range (300A, 300B, 310) of at least one other of the plurality of sensors (30A, 30B, 31) is arranged or located in front of the furrow closing and / or pressing element (26).

5. Row unit (20) according to at least one of the preceding claims, characterized in that at least one of the plurality of sensors (30A, 30B, 31) is arranged and configured so as to detect the distribution material, which is at least partially pressed into the seed furrow (230) by a catching and / or pressing roller (25) arranged behind the furrow opening element (23) and / or the depth guidance element (24A, 24B), the evaluation device (200) preferably being configured to take into account the detected pressed-in distribution material when determining the deposition depth and / or coverage height, and the evaluation device (200) particularly preferably being configured to determine, on the basis of the detected pressed-in distribution material, the height and / or the amount with which the distribution material is pressed into the seed furrow (230).

6. Row unit (20) according to claim 1, characterized in that the evaluation device (200) is configured to check the plausibility of the detected and / or determined deposition depth and / or coverage height on the basis of predefinable operating parameters, in particular a share pressure and / or a contact force of the row unit (20) and / or a condition of the land, the evaluation device (200) preferably being configured to take into account and / or filter sensor signals generated by the sensors (30A, 30B, 31) depending on the plausibility, in particular on the operating parameters.

7. Agricultural seed drill, in particular a precision seed drill (10), for depositing distribution material, in particular seed and / or fertilizer, onto agricultural land, comprising one or more row units, characterized in that the one or more row units (10) are designed according to at least one of the preceding claims.

8. Method for determining a deposition depth and / or coverage height of a distribution material deposited on agricultural land by means of a row unit (20) of an agricultural seed drill (10), comprising the steps of: - opening a seed furrow (230) along the land by means of at least one furrow opening element (23) assigned to the row unit (20), in particular a share; - supplying and / or depositing the distribution material within the seed furrow (230) by means of at least one material depositing device (22) assigned to the row unit (20); - setting a defined deposition depth and / or coverage height for the distribution material and / or a defined penetration depth of the furrow opening element (23) into the soil (B) of the land, by means of at least one depth guidance element (24A, 24B) assigned to the row unit (20); and - detecting and / or determining the deposition depth and / or coverage height of the distribution material deposited in the seed furrow (230) by means of at least one evaluation device (200) assigned to the row unit (20), the evaluation device (200) comprising a plurality of sensors (30A, 30B, 31) which, during the deposition of the distribution material, contactlessly scan the land, preferably the seed furrow (230) and / or the soil (B) of the land, within a detection range (300A, 300B, 310) assigned to the respective sensors (30A, 30B, 31); the sensors (30A, 30B, 31) being arranged such that, during the placement of the distribution material and in the direction of travel and / or work (F) of the row unit (20), the detection range (300A, 300B, 310) of the plurality of sensors (30A, 30B, 31) is located behind a contact area (AA, AB) of the at least one depth guidance element (24A, 24B), characterized in that the row unit (20) is designed according to at least one of the preceding claims 1 to 6.

9. Method according to claim 8, characterized in that, on the basis of the sensors (30A, 30B, 31), in particular of the detection range (300A, 300B, 310) of the sensors (30A, 30B, 31), the land, in particular the seed furrow (230) and / or the soil (B) of the land, is detected and / or scanned behind the contact area (AA, AB) of the at least one depth guidance element (24A, 24B).