The influence of the angle of loosening of the working body of an agricultural instrument on the intensity of destruction of soil aggregates

The consequence of mechanical tillage, in addition to achieving positive results, are also negative consequences associated with the destruction of the primary soil microaggregates. Some of the soil microaggregates that are in direct contact with the surface of the working body of the agricultural tools are crushed and destroyed. Directly microaggregate is a sustainable soil aggregate, or structural unit of ripe soil. In the center of the microaggregate there are solid particles of the parent rock, as a rule, these are SiO2 silica, around which there is a dense organic shell. The very fact of the destruction of the primary soil microaggregates in the treated soil layer is confirmed by the wear of the working bodies of agricultural tools, which are carried out by abrasive particles of the parent rock due to the destruction of the microaggregates themselves. It turns out that the intensity of wear of the working bodies indirectly characterizes the intensity of the destruction of soil microaggregates. As a result of the processing of ripe soils, its loosening in order to ensure at least 50 % of porosity, simultaneously grinding, destroys a certain layer of the structure of the aggregate structure of the same soil. These contradictions form the problem of finding a solution, reducing the possibility of destruction of the aggregate structure of the soil when it is processed by agricultural tools. The purpose of this work was to identify the influence of the geometrical parameters of the working bodies of agricultural tools on the intensity of destruction of microaggregates in the adjacent soil layer. This goal was achieved through theoretical studies and with the use of simulation laboratory tests, as a result of which the intervals of the geometric characteristics of the working bodies, at which the smallest destruction of soil microaggregates is achieved, are determined.

destruction of soil microaggregates, normal soil pressure, shear forces, dilatancy