1. A system for additional energization zemleobrabatyvayuschego instruments having a frame and a plurality of row units mounted movably on the frame for movement relative thereto, comprising:at least one actuator acting between the frame and the sowing section each for applying an additional clamping force to each sowing unit anda control system configured to control actuators, comprising a load sensor for each row unit for measuring action counteracting soil forces on each sowing unit, a controller, configured to receive an input signal from each load cell and grouping the plurality of row units in at least a first a group of row units and a second group of row units, and defining the first additional downforce for the application to each sowing unit in the first group of row units and second additional downforce for the application to each sowing unit in the second group of row units, and means of operation of the actuators for the application of the first and second additional clamping force to the first and second groups of row units.2. The system of claim 1, wherein:actuators are pneumaticthe controller is configured to determine the air pressure for application to each actuator andwherein the control system comprises an air compressor and a valve operably coupled to each actuator for applying pressure required to obtain the desired additional downforce on each sowing unit.3. The system of claim 1, wherein between each row unit and the frame there are two actuators - the actuator upward force and the actuator clamping force, with an additional clamping force is the combined effort applied to the sowing unit actuators upward force and downforce.4. The system of claim 1, wherein the controller periodically determines which of the at least first and second groups classified each sowing unit.5. The system of claim 1, wherein each time the gun is raised or lowered, the controller determines which of the at least first and second groups classified each sowing unit.6.
