INFLUENCE OF TILLAGE ON STOCKS OF NUTRIENTS IN SEGREGATED CHERNOZEM

Abstract

In the conditions of field experience, the influence of different methods of primary processing (plowing, dump, surface and zero) on the reserves of nutrients (nitrate nitrogen, mobile phosphorus and exchangeable potassium) at depths of 0…10, 10…20 and 20…30 cm and in the layer 0…30 cm was considered. The degree of heterogeneity of the arable layer was estimated by the coefficient of variation at depths of 0…10 and 10…20 cm for each plant nutrient being determined. Stocks of all nutrients both at separate depths and in the layer 0…30 cm of agrochernozems under the conditions of the experiment increased by the end of the growing season of winter wheat. It is shown that the increase in nitrate stocks most significantly occurred when using small treatments, the depth of the impact on agrochernozems which did not exceed 10 cm (surface and zero treatment). The highest reserves of mobile phosphorus in the layer 0…30 cm had the options of experience with in-depth treatment of agrochernozems. However, during the growing season, the rate of increase in the reserves of this food element in the specified layer was higher in options with small treatments due to their significant increase at the upper depths. Approximately the same picture was observed for the exchange of potassium. Clear, observed time trends of homogeneity of arable horizon on stocks of batteries depending on the considered methods of tillage, have been identified. The expected trend related to a higher degree of homogeneity of the distribution of nutrients in the arable horizon of ploughing plots compared to other variants of experience, especially with zero treatment, is not always confirmed.