ORGANIC MATTER BIOLOGICAL QUALITY EVALUATION IN STRUCTURAL AGGREGATES OF LEAKED CHERNOZEM UNDER PROCESSING MINIMIZATION CONDITIONS
The purpose of the paper is to evaluate the biological quality of the structural aggregates of leached chernozem under conditions of minimizing processing. The studies were carried out in the Krasnoyarsk natural district on the land areas of the SEC Shilinskoye, Sukhobuzimsky District (56°57' N, 93°76' E). The influence of soil tillage methods on the biological quality of structural aggregates was studied in 2014. Reference plots with an area of 500 m<sup>2</sup> were identified within the production crops. Soil samples were taken from each of them from layers 0-5 and 5-20 cm using the snake method. The sample size (n=15) was calculated based on the soil fertility variation determined before the experiment. The object of research is a leached multihumus powerful light clayey chernozem on brown clay. The sizes of structural aggregates selected for the study: >10, 10-7, 7-5, 5-3, 3-2, 2-1 and <1 mm. The biological quality of organic matter was characterized by maximum values when using the surface disking technology, especially in the 0-5 cm layer. In the 5-20 cm layer, aggregates 10-7 and 3-2 mm in size were noted with the maximum rate of mineralization, while aggregates <1 mm were the lowest. The processing method makes the maximum contribution to the parameters of the biological quality of the organic matter of the leached chernozem. In layers of 0-5 cm, its influence is more than 80 %; in the layer of 5-20 cm, its share decreases to 60 %. The sizes of aggregates with depth increase the degree of their participation in biochemical processes.