Broadcast system for broadcasting broadcast material, and method for broadcasting broadcast material onto an area of agricultural land

Abstract

The invention relates to a broadcast system (10) for broadcasting broadcast material onto an area of agricultural land, comprising: a metering device (18, 18a, 18b) for metering broadcast material into a conveying air flow; a distribution device (20) for distributing the broadcast material metered into the conveying air flow to a plurality of blockable outlets (22) of the distribution device (20), wherein the distribution device (20) comprises a circulation path (28) which allows broadcast material to circulate when the outlets (22) are blocked; and an electronic control device (26) for controlling the operation of the metering device (18, 18a, 18b).

Description

[0001]Description of an application system for spreading material and a method for spreading material on agricultural land. The invention relates to an application system for spreading material on agricultural land according to the preamble of claim 1 and a method for spreading material on agricultural land according to the preamble of claim 15. Application systems for spreading material on agricultural land typically have a metering device for metering the application material into a conveying air stream. The application material metered into the conveying air stream is then distributed in a distribution device to several lockable outlets of the distribution device.In modern application systems, the distribution unit can be designed as a distributor head with a recirculation path, where the recirculation path allows the application material to circulate even when the outlets are closed. When controlling the operation of the application system's metering unit, the characteristics of the distribution unit's recirculation path have so far been disregarded. As a result, the metering of the application material by the metering unit in distribution systems with a recirculation path is currently started and stopped with relatively imprecise timing. This relatively imprecise starting and stopping of the metering of the application material into the conveying airflow leads to fluctuations in the material density within the distribution unit, ultimately resulting in fluctuations in the seeding rate.EP 3 888 435 A1 discloses a spreading system for an agricultural pneumatic distribution machine designed as a seed drill, which distributes fertilizer and / or seed as spreading material on agricultural land. The spreading system has at least one, in this case two, storage hoppers, each connected to a metering device. The metering device is designed for metering spreading material into a conveying air stream. The spreading system further comprises a distribution device designed as a distributor head for distributing the spreading material metered into the conveying air stream to several lockable outlets of the distribution device. The distribution device includes a recirculation path that allows the spreading material to circulate even when the outlets are closed.Each circulation path extends from a lockable outlet back to the conveying airflow, which in this application system is guided through a so-called riser pipe. The application system also includes an electronic control unit for controlling the operation of the metering unit. This control unit is configured to take into account the conveying time of the application material from the distributor head to the depositing devices or from the metering unit to the distribution device. The circulation path is thus disregarded, resulting in negative fluctuations in the seeding rate. The objective of the invention is therefore to reduce fluctuations in seeding rate during material application using an application machine whose distribution device has a circulation path that allows the application material to circulate even when the outlets are closed.The problem is solved by a dispensing system of the type mentioned above, wherein the control device of the dispensing system according to the invention is configured to control the metering device as a function of a cycle time, which relates to the duration of one cycle of dispensing material circulating in the cycle path. By controlling the metering device as a function of the cycle time, the feed start time, at which the metering of dispensing material into the conveying air flow by the metering device is started, and the feed interruption time, at which the metering of dispensing material into the conveying air flow by the metering device is interrupted, can be coordinated with the cycle time of the dispensing material in the cycle path.By taking the cycle time into account when controlling the metering unit P24-025, fluctuations in material density within the distribution unit, and consequently also fluctuations in seeding rate, are significantly reduced. The lockable outlets are each connected to at least one dispensing device via a discharge line. The distribution system preferably includes a storage container for the application material. The distribution system can be used, for example, to apply seed and / or fertilizer to the agricultural land. The placement devices connected to the lockable outlets via the discharge line can therefore be seed coulters or fertilizer coulters. The circulation path is formed from at least one of the lockable outlets back to the conveying airflow. Preferably, a line is provided for this purpose. Particularly preferably, each lockable outlet is connected to the conveying airflow, i.e., not only from the direction of the distribution unit.In a preferred embodiment of the application system according to the invention, the control device is configured to initiate the metering of application material into the conveying airflow by the metering device at a specific injection start time. The control device is configured to determine this injection start time based on the cycle time. The injection start time precedes the point at which a material discharge point of the application system crosses a boundary of the material discharge area when entering the area. The material discharge point of the application system can, for example, be a discharge opening through which the application material is discharged towards the agricultural area. The boundary of the material discharge area can, for example, be a field boundary.The field boundary can be an external field boundary that delimits the agricultural land. Alternatively, the field boundary can be an internal field boundary, e.g., at the transition to the headland. In a further preferred embodiment of the application system according to the invention, the control device is configured to determine the start time of the application based on the conveying time of the application material along a conveying path between the metering device and the distribution device. The conveying time of the application material along the conveying path between the metering device and the distribution device can be a conveying start-specific conveying time, which differs from a conveying interruption-specific conveying time along the same conveying path. The conveying time of the application material along the conveying path between the metering device and the distribution device can depend on the driving speed.Due to differing speed profiles when entering and exiting a material discharge area of ​​the agricultural land, differing material densities can occur in the distribution device. The distribution system according to the invention is further advantageously developed in that the control device is configured to determine the feed start time as a function of the conveying time of the material along a conveying path between the distribution device and a material discharge point of the distribution system, or the conveying time of the material along a conveying path between the distribution device and the soil of the agricultural land. At the material discharge point of the distribution system, the material is discharged towards the soil of the agricultural land.The conveying time of the application material along the conveying path between the distribution unit and the material discharge point of the application system can be a feed-start-specific conveying time, which differs from a feed-out interruption-specific conveying time along the same conveying path. Similarly, the conveying time of the application material along the conveying path between the distribution unit and the soil of the agricultural land can be a feed-start-specific conveying time, which differs from a feed-out interruption-specific conveying time along the same conveying path.In a further preferred embodiment of the application system according to the invention, the control device is configured to determine the start time of the feed-in as a function of a crossing time at which P24-025 crosses a boundary of a material discharge point of the application system when entering a material discharge area of ​​the agricultural land. Alternatively or additionally, the control device can be configured to determine the start time of the feed-in as a function of a release time at which a blocked outlet of the distribution device is released. The material discharge area can, for example, border the headland. The application system can include a positioning system to determine the material discharge area and the relative position to the material discharge area. The positioning system can be satellite-based and / or a GPS system.The control unit is preferably configured to perform its calculations based on target and actual positions. The feed-in start time is preferably calculated by the control unit starting from a determined crossing time at which a material discharge point of the application system crosses a boundary of the material discharge area when entering a material discharge area of ​​the agricultural land. From the crossing time, the conveying time of the application material along the conveying path between the distribution unit and the material discharge point of the application system is first subtracted. Additionally, the conveying time of the application material along the conveying path between the metering unit and the distribution unit, reduced by the cycle time, is subtracted. Thus, the control unit calculates the feed-in start time as follows: T. ES = T Ü,ein - t F2,ein - (t F1,ein - tU ) In the above calculation formula, T concerns ES the feed-in start time, T Ü,ein the crossing point at which a material dispensing point of the application system crosses a boundary of the material dispensing area when entering a material dispensing area of ​​the agricultural land, t F1,ein the feed-start-specific conveying time of the application material along the conveying path between the dosing unit and the distribution unit, t F2,ein the feed-start-specific conveying duration of the P24-025 application material along the conveying path between the distribution device and the material discharge point of the application system and t UThe circulation time of the application material in the circulation path. In another preferred embodiment of the application system according to the invention, the control device is configured to interrupt the metering of application material into the conveying airflow by the metering device at a feed interruption point. The feed interruption point is located before the point at which a material discharge point of the application system, while exiting a material discharge area of ​​the agricultural land, crosses a boundary of the material discharge area. Furthermore, an application system according to the invention is preferred in which the control device is configured to determine the feed interruption point as a function of the conveying time of the application material along a conveying path between the metering device and the distribution device.The conveying time of the application material along the conveying path between the metering device and the distribution device can be a conveying time specific to the point of interruption of the feed-in, which differs from a conveying time specific to the point of start-up along the same conveying path. In a further preferred embodiment of the application system according to the invention, the control device is configured to determine the point of interruption of the feed-in as a function of the conveying time of the application material along a conveying path between the distribution device and a material discharge point of the application system, or of the conveying time of the application material along a conveying path between the distribution device and the soil of the agricultural area. At the material discharge point of the application system, the application material is discharged towards the soil of the agricultural area.The conveying time of the application material along the conveying path between the distribution unit and the material discharge point of the application system can be a feed-in interruption-specific conveying time, which differs from a feed-in start-specific conveying time along the same conveying path. Similarly, the conveying time of the application material along the conveying path between the distribution unit and the soil of the agricultural area can be a feed-in interruption-specific conveying time, which differs from a feed-in start-specific conveying time along the same conveying path.Furthermore, an application system according to the invention is advantageous in which the control device is configured to determine the feed interruption time as a function of a crossing time at which a material dispensing point of the application system crosses a boundary of the material dispensing area when exiting a material dispensing area of ​​the agricultural land. Alternatively or additionally, the control device can be configured to determine the feed interruption time as a function of a blocking time at which a released outlet of the distribution device is blocked. The material dispensing area can, for example, border the headland.The control unit determines the feed interruption time preferably based on the point at which a material discharge point of the application system crosses a boundary of the material discharge area while exiting the area. From this point, the conveying time of the material along the conveying path between the distribution unit and the material discharge point of the application system is first subtracted. Additionally, a conveying time of the material along the conveying path between the metering unit and the distribution unit, reduced by the cycle time, is subtracted. The control unit therefore preferably calculates the feed interruption time as follows: T. EU = T Ü,aus - t F2,aus - (t F1,aus - t U ) In the above calculation formula, T concerns EU the time of the power supply interruption, T Ü,austhe crossing time at which P24-025, when exiting a material dispensing area of ​​the agricultural land, crosses a boundary of the material dispensing area, a material dispensing point of the application system, t F1,aus the feed interruption-specific conveying time of the discharge material along the conveying path between the dosing unit and the distribution unit, t F2,aus the feed interruption-specific conveying duration of the discharge material along the conveying route between the distribution device and the material discharge point of the discharge system and t UThe circulation time of the dispensed material in the circulation path. In another preferred embodiment of the dispensing system according to the invention, the outlets can be locked and unlocked via switchable locking elements, the control device being configured to control the switching of the locking elements. The locking elements can be, for example, rotatable or pivotable flaps or rockers by means of which the outlets can be blocked. The switchable locking elements can be moved via controllable actuators. The actuators can be controlled by the control device. Furthermore, a dispensing system according to the invention is preferred in which the control device is configured to determine a release time at which a locked outlet of the distribution device is released.Alternatively or additionally, the control device can be configured to determine a blocking time at which a released outlet of the distribution device is blocked. The control device can be configured to determine the release time and / or the blocking time as a function of the conveying time of the application material along a conveying path between the blocking element and the material discharge point of the application system, or a conveying time of the application material along a conveying path between the blocking element and the soil of the agricultural area. By determining release and / or blocking times, the blocking elements can be switched precisely. P24-025 In another preferred embodiment of the application system according to the invention, the lockable outlets are each connected to at least one depositing device via a distribution line.A seed counter for determining the seeding density is preferably arranged at at least one outlet and / or along at least one application line and / or at at least one depositing device and / or at least one circulation path. By evaluating the data from the seed counter, it can be investigated whether the determined feed start times and / or the determined feed interruption times and / or the determined release times and / or the determined blocking times lead to fluctuations in the seeding density that lie within a tolerance range. For seed counters arranged on circulation paths, the terms circulation density or material density can also be used analogously when referring to seeding density.In a preferred embodiment of the application system according to the invention, the control device is configured to determine the start and / or end times of the feed as a function of the seeding density. In particular, the control device is configured to correct the seeding density, i.e., to increase and / or decrease it. Any fluctuations that may occur can thus not only be detected but also compensated for. In another preferred embodiment of the application system according to the invention, a seed detection sensor is arranged upstream of, within, and / or downstream of the distribution device in the flow direction of the application material. This sensor is used to determine the conveying time of the application material along the conveying path between the metering device and the distribution device and / or to determine the circulation time. The seed detection sensor can be an optical encoder.The presence of application material in a detection area can be determined by means of the granule detection sensor. In a preferred embodiment, the application system according to the invention has several metering devices for metering different application materials into one or more conveying air streams. The distribution device serves to distribute the application material metered into the one or more conveying air streams to several lockable outlets of the distribution device, wherein the circulation path allows the application materials to circulate when the outlets are locked. The control device preferably serves to control the operation of the several metering devices.The problem underlying the invention is further solved by a method of the type mentioned at the outset, wherein, within the framework of the method according to the invention, the control device controls the metering device as a function of a circulation period, which relates to the duration of one revolution of the application material circulating in the circulation path. Within the framework of the method according to the invention, the application material is preferably applied to the agricultural land by means of an application system according to one of the embodiments described above. With regard to the advantages and modifications of the method according to the invention, reference is therefore also made to the advantages and modifications of the application system according to the invention. Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. These show: Fig.Fig. 1 shows a schematic representation of a prior art application system; Fig. 2 shows the conveying durations and times occurring during the operation of the application system shown in Fig. 1; Fig. 3 shows a schematic representation of an application system according to the invention; Fig. 4 shows the conveying durations and times occurring during the operation of the application system shown in Fig. 3; P24-025 Fig. 5 shows a schematic representation of another application system according to the invention; and Fig. 6 shows a schematic representation of another application system according to the invention. Fig. 1 shows a prior art application system 10' for applying material to an agricultural area. The application system 10' has a flow generator 12' which generates a conveying air flow. The generated conveying air flow travels along a flow path 14a' to a metering device 18'.The metering device 18' meters application material from the storage hopper 16' into the conveying air stream. The conveying air stream, loaded with application material, is directed via the conveying section 14b' to a distribution device 20'. The distribution device 20' serves to distribute the application material metered into the conveying air stream to several outlets 22' of the distribution device 20'. The outlets 22' are each connected via a conveying section 14c' extending along a spreading line to a depositing device 24'. The depositing devices 24' serve to deposit the application material onto the agricultural land. The application system 10' includes a control device 26'. The control device 26' serves to control the metering device 18'. The control device 26' controls the metering device 18' in such a way that the metering of application material into the conveying air flow occurs at a feed start time T. ES' is started and at a feed-in interruption time T EU ' is interrupted. Fig. 2 shows that the discharge material metered into the conveying air flow is interrupted after a conveying duration t. F ' at a crossing time T Ü,ein ', to which a material discharge point of the application system crosses a boundary of the material discharge area when entering a material discharge area of ​​the agricultural land, at the material discharge point, namely a discharge opening, of the depositing device 24'. If the material application is interrupted, after the conveying duration t F ' after the P24-025 feed-in interruption time T EU ' at the time of crossing T Ü,aus', to which a material discharge point of the application system, when exiting a material discharge area of ​​the agricultural land, crosses a boundary of the material discharge area, no more application material is present at the material discharge point of the depositing device 24'. Fig. 3 shows an application system 10 according to the invention for applying application material to an agricultural land. The application system 10 has a flow generator 12 designed as a blower. The flow generator 12 generates a conveying air flow, which is directed along a flow path 14a to a metering device 18. The metering device 18 serves to meter application material from the storage container 16 into the conveying air flow. The metering device 18 can, for example, be a rotary valve. The metering device can, for example, be electrically, pneumatically, and / or hydraulically driven.The conveying air flow loaded with the dispensing material is directed via conveying section 14b to a distribution device 20 designed as a distributor head. The conveying time required for the dispensing material to pass through conveying section 14b is given by t. F1 marked. The funding period t F1 The values ​​for starting and stopping the material feed may differ (see t). F1,ein and t F1,aus(in Fig. 4). The distribution device 20 serves to distribute the application material metered into the conveying airflow to several lockable outlets 22 of the distribution device 20. The distribution device 20 has a circulation path 28, which allows circulation of the application material when the outlets 22 are closed. The application material conveyed out of the distribution device 20 via the outlets 22 reaches the depositing devices 24 via the conveying sections 14c. The depositing devices 24 serve to deposit the application material onto the agricultural land. The application system 10 has an electronic control device 26 for controlling the operation of the metering device 18. The control device 26 is configured to control the metering device 18 depending on a circulation period P24-025 t. Uto control. The cycle time refers to the duration of one cycle of the dispensing material circulating in the cycle path 28. The outlets 22 are switchable locking devices, such as flaps or rocker switches, which can be locked and unlocked. The control unit 26 is configured to control the switching of the locking devices. The control unit 26 determines the release times T. F , at which blocked outlets 22 of the distribution device 20 are released, and blocking times T S , at which released outlets 22 of the distribution unit 20 are blocked. The control unit 26 is configured to determine the release times T F and the blocking times T S depending on the funding period t F2 to determine the amount of material discharged along the conveying path 14c between the heavy body and the material discharge point of the discharge system 10. The conveying duration t F2The values ​​for starting and stopping the material feed may differ (see t). F2,ein and t F2,aus (in Fig. 4). As shown in Fig. 4, the control device 26 is configured to meter the discharge material into the conveying air flow by the metering device 18 at a feed start time T. ES to start, whereby the control device sets the feed-in start time t ES depending on the orbital period t U determined. The feed-in start time T ES is in time prior to a crossing time T Ü,ein , at which point a material discharge point of the application system 10 crosses a boundary of the material discharge area when entering a material discharge area of ​​the agricultural land. The control unit 26 determines the feed start time T. ES depending on a funding period t F1,einof the discharge material along the conveying section 14b between the dosing unit 18 and the distribution unit 20. Furthermore, the control unit 26 determines the feed start time T. ES depending on the funding period t F2,ein of the discharge material along the conveying line 14c between the distribution unit 20 and a material discharge point of the discharge system 10. P24-025 The control unit 26 determines the feed start time T ES according to the following calculation formula: T ES = T Ü,ein - t F,ein = T Ü,ein - t F2,ein - (t F1,ein - t U ) In the above calculation formula, T concerns ES the feed-in start time, T Ü,ein the crossing point at which a material dispensing point of the application system crosses a boundary of the material dispensing area when entering a material dispensing area of ​​the agricultural land, t F1,einthe feed-start-specific conveying time of the application material along the conveying path between the dosing unit and the distribution unit, t F2,ein the feed-start-specific conveying duration of the application material along the conveying route between the distribution facility and the material discharge point of the application system and t U The circulation time of the application material in the circulation path. t F,ein This concerns the total conveying time of the application material between the metering unit and the material discharge point, specific to the feed start. The control unit 26 is further configured to control the metering of application material into the conveying airflow by the metering unit 18 at a feed interruption time T. EU to interrupt. The feed-in interruption time T EU is in time prior to a crossing time T Ü,aus, at which point a material discharge point of the application system 10 crosses a boundary of the material discharge area when exiting a material discharge area of ​​the agricultural land. The control device 26 determines the feed interruption time T. EU depending on a funding period t F1,aus of the discharge material along a conveying section 14b between the metering device 18 and the distribution device 20. Furthermore, the control device 26 determines the feed interruption time T. EU depending on a funding period t F2,aus of the discharge material along a conveying line 14c between the distribution device 20 and a material discharge point of the discharge system 10. The control device 26 calculates the feed interruption time T. EU the following calculation formula: P24-025 T EU = T Ü,aus - t F,aus = T Ü,aus - t F2,aus - (t F1,aus - t U) In the above calculation formula, T concerns EU the time of the power supply interruption, T Ü,aus the crossing point at which a material dispensing point of the application system, when exiting a material dispensing area of ​​the agricultural land, crosses a boundary of the material dispensing area, t F1,aus the feed interruption-specific conveying time of the discharge material along the conveying path between the dosing unit and the distribution unit, t F2,aus the feed interruption-specific conveying duration of the discharge material along the conveying route between the distribution device and the material discharge point of the discharge system and t U The circulation time of the application material in the circulation path. t F,ausThis concerns the total conveying time of the application material between the metering device and the material discharge point, specific to the feed interruption. Fig. 5 shows an application system 10 in which the lockable outlets 22 are each connected to a storage device 24 via an application line. A seed counter 30c for determining the seeding density is located at the outlet 22. Furthermore, seed counters 30a, 30b are arranged in the inflow area immediately upstream of the distribution device 20 and in the area of ​​a distribution chamber within the distribution device 20. In an embodiment not shown, it is conceivable that a seed counter 30a-30c is arranged on a circulation path 28. Fluctuations in the material density can be detected via the seed counters 30a-30c, which ultimately lead to fluctuations in the seeding rate.Taking into account the sensor data of the grain counting devices 30a-30c, the control device 26 can determine the feed-in start times T. ES and / or the feed-in interruption times T EU adjust. In particular, excessively high material density during switch-on can be corrected by adjusting the feed-in start times T. ES The timing can be shifted later so that material already in circulation path 28 is discharged before new material is conveyed via the dosing device 18. This also makes it possible, either alternatively or additionally, to correct an excessively high material density (P24-025) when switching off by adjusting the feed interruption time T. EU The feed-in start time is shifted forward. If the density is to be influenced in the opposite way, it is possible to adjust the feed-in start time T. ES forward in time and / or the feed-in interruption times T EUto shift the timing to a later point. Fig. 6 shows a dispensing system 10 with several metering devices 18a, 18b for metering different dispensing materials into a conveying airflow generated by the flow generator 12. Metering device 18a meters the dispensing material from the storage container 16a. Metering device 18b meters the dispensing material from the storage container 16b. The distribution device 20 serves to distribute the dispensing material metered into the conveying airflow from the storage containers 16a, 16b. The recirculation path 28 allows the material mixture to circulate when the outlets 22 are closed. The control device 26 serves to control the operation of the metering devices 18a, 18b. The operation of the dosing devices 18a, 18b is controlled by the control device 26 depending on the cycle time t U controlled, with the period t Uthe duration of one revolution of application material circulating in circulation path 28. P24-025 Reference numeral 10' Application system 12' Flow generator 14a' Flow path 14b', 14c' Conveyor paths 16' Storage hopper 18' Metering device 20' Distribution device 22' Outlets 24' Depositing devices 26' Control device T Ü,ein ' Crossing time T Ü,aus ' Crossing time T ES 'Feed-in start time T EU 'Time of feed-in interruption t F ' Conveyor duration 10 Dispensing system 12 Flow generator 14a Flow path 14b, 14c Conveyor paths 16, 16a, 16b Storage hopper 18, 18a, 18b Metering devices 20 Distribution device 22 Outlets 24 Depositing devices 26 Control device 28 Circulation path 30a-30c Grain counting devices T Ü,ein Crossing time T Ü,aus Crossing time P24-025 T ES Feed-in start time T EU Feed-in interruption time T F Release time T SLock time t F,ein , t F,aus Funding periods t F1,ein , t F1,aus Funding periods t F2,ein , t F2,aus Funding periods t U Circulation period P24-025

Claims

Claims 1. Application system (10) for applying application material to an agricultural area, comprising: - a metering device (18, 18a, 18b) for metering application material into a conveying air stream; - a distribution device (20) for distributing the application material metered into the conveying air stream to several lockable outlets (22) of the distribution device (20), wherein the distribution device (20) comprises a circulation path (28) which allows circulation of application material when the outlets (22) are closed; and - an electronic control device (26) for controlling the operation of the metering device (18, 18a, 18b); characterized in that the control device (26) is configured to control the metering device (18, 18a, 18b) depending on a circulation period (t). U) to control, which relates to the duration of a revolution of the circulating discharge material in the circulation path (28).

2. Dispensing system (10) according to claim 1, characterized in that the control device (26) is configured to control the metering of discharge material into the conveying air flow by the metering device (18, 18a, 18b) at a feed start time (T ES ) to start, wherein the control device (26) is configured to determine the feed-in start time (T ES ) depending on the orbital period (t U ) to determine.

3. Dispensing system (10) according to claim 2, characterized in that the control device (26) is configured to determine the feed-in start time (T ES ) depending on a funding period (t F1,ein ) of the dispensed material along a conveying section (14b) between the metering device (18, 18a, 18b) and the distribution device (20). P24-025 4. Dispensing system (10) according to claim 2 or 3, characterized in that the control device (26) is configured to determine the feed-in start time (T ES ) depending on a funding period (t F2,ein ) of the application material along a conveying path (14c) between the distribution device (20) and a material discharge point of the application system (10) or a conveying duration of the application material along a conveying path between the distribution device (20) and the soil of the agricultural land.

5. Application system (10) according to one of claims 2 to 4, characterized in that the control device (26) is configured to determine the feed start time (T ES ) - depending on a crossing time (T Ü,ein), to determine the point at which a material delivery point of the application system (10) crosses a boundary of the material delivery area when entering a material delivery area of ​​the agricultural land; and / or - depending on a release time (T F ), to determine the point at which a blocked outlet (22) of the distribution device (20) is released.

6. Dispensing system (10) according to one of the preceding claims, characterized in that the control device (26) is configured to control the metering of dispensing material into the conveying air flow by the metering device (18, 18a, 18b) at a feed interruption time (T EU ) to interrupt.

7. Dispensing system (10) according to claim 6, characterized in that the control device (26) is configured to determine the feed interruption time (T EU ) depending on a funding period (t F1,aus) of the dispensed material along a conveying section (14b) between the metering device (18, 18a, 18b) and the distribution device (20). P24-025 8. Dispensing system (10) according to claim 6 or 7, characterized in that the control device (26) is configured to determine the feed interruption time (T EU ) depending on a funding period (t F2,aus ) of the application material along a conveying path (14c) between the distribution device (20) and a material discharge point of the application system (10) or a conveying duration of the application material along a conveying path between the distribution device (20) and the soil of the agricultural land.

9. Application system (10) according to one of claims 6 to 8, characterized in that the control device (26) is configured to determine the feed interruption time (T EU ) - depending on a crossing time (T Ü,aus), to determine the point at which a material delivery point of the application system (10) crosses a boundary of the material delivery area when exiting a material delivery area of ​​the agricultural land; and / or - depending on a closure time (T S ), at which a released outlet (22) of the distribution device (20) is blocked.

10. Dispensing system (10) according to one of the preceding claims, characterized in that the outlets (22) can be blocked and released via switchable locking elements, wherein the control device (26) is configured to control the switching of the locking elements.

11. Dispensing system (10) according to claim 10, characterized in that the control device (26) is configured to determine a release time (T F ), at which a blocked outlet (22) of the distribution device (20) is released; and / or - a blocking time (T S), to determine which released outlet (22) of the distribution device (20) is blocked; P24-025 wherein the control device (26) is configured to determine the release time (T F ) and / or the blocking time (T S ) depending on a funding period (t F2,ein , t F2,aus) of the application material along a conveying path (14c) between the barrier body and a material discharge point of the application system (10) or of a conveying duration of the application material along a conveying path between the barrier body and the soil of the agricultural area.

12. Application system (10) according to one of the preceding claims, characterized in that the lockable outlets (22) are each connected via an application line to at least one depositing device (24), wherein a seed counting device (30a-30c) for determining the seeding density is arranged at at least one outlet (22) and / or along at least one application line and / or at at least one depositing device (24) and / or on a circulation path (28). 13.Dispensing system (10) according to one of the preceding claims, characterized in that a grain detection sensor for determining the conveying time (t.) is provided in the flow direction of the dispensing material upstream of the distribution device (20) and / or in the distribution device (20) and / or downstream of the distribution device (20). F1,ein , t F1,aus ) of the discharge material along the conveying path (14b) between the metering device (18, 18a, 18b) and the distribution device (20) and / or to determine the circulation time (t U) is arranged.

14. Application system (10) according to one of the preceding claims, characterized by several metering devices (18, 18a, 18b) for metering different application materials into one or more conveying air streams.

15. Method for applying application material to an agricultural area by means of an application system (10), in particular by means of an application system (10) according to one of the preceding claims, comprising the steps: P24-025 - Metering of application material into a conveying air flow by means of a metering device (18, 18a, 18b) of the application system (10); - Distributing the application material metered into the conveying air flow to several lockable outlets (22) of the distribution device (20) by means of a distribution device (20) of the application system (10), wherein the distribution device (20) comprises a circulation path (28) which allows circulation of application material when the outlets (22) are closed; and - Controlling the operation of the metering device (18, 18a, 18b) by means of an electronic control device (26) of the application system (10); characterized in that the control device (26) controls the metering device (18, 18a, 18b) depending on a circulation period (t). U ) controls the duration of one revolution of the application material circulating in the circulation path (28). P24-025

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