Tillage system with variable fertilizer application

An agricultural tillage system, comprising:

• an agricultural vehicle;
• an agricultural implement towed by the agricultural vehicle and comprising a frame and a plurality of ground engaging tools connected to the frame;
• a fertilizer device connected to the agricultural implement and configured for applying at least one liquid fertilizer, the fertilizer device comprising a plurality of fluid lines and a plurality of fertilizer applicator assemblies fluidly connected to the plurality of fluid lines, and each fertilizer applicator assembly comprising an applicator connected to the frame and a valve fluidly connected to the applicator, and the valve being configured for varying a rate of the at least one liquid fertilizer through the applicator;
• and
• an electronic control unit operably connected to the valves of the plurality of fertilizer applicator assemblies and configured for automatically adjusting the valve of at least one fertilizer applicator assembly of the plurality of fertilizer applicator assemblies to vary the rate of the at least one liquid fertilizer, dependent upon a fertilizer requirement characteristic, the electronic control unit being configured for adjusting a depth of the plurality of ground engaging tools dependent upon a compaction layer characteristic, wherein the electronic control unit is configured to determine the compaction layer characteristic based at least upon a crop yield map data and upon real-time compaction layer data determined by a compaction layer sensor.

A method for working a field, comprising:

• providing an agricultural implement comprising a frame, a plurality of ground engaging tools connected to the frame, a fertilizer device configured for applying at least one liquid fertilizer and comprising a plurality of fluid lines and a plurality of fertilizer applicator assemblies fluidly connected to the plurality of fluid lines, and each fertilizer applicator assembly comprising an applicator connected to the frame and a valve fluidly connected to the applicator, and the valve being configured for varying a rate of the at least one liquid fertilizer through the applicator, and an electronic control unit operably connected to the valves of the plurality of fertilizer applicator assemblies;
• and
• adjusting the valve of at least one fertilizer applicator assembly of the plurality of fertilizer applicator assemblies to vary the rate of the at least one liquid fertilizer, dependent upon a fertilizer requirement characteristic;
• and
• adjusting, by the electronic control unit, a depth of the plurality of ground engaging tools dependent upon a compaction layer characteristic, wherein the electronic control unit is configured to determine the compaction layer characteristic based at least upon a crop yield map data and upon real-time compaction layer data determined by a compaction layer sensor.