Seasonal dynamics of nutrients in soil and change of their ratio depending on hydrothermal conditions of the year

Abstract

The purpose. To determine regularities of seasonal dynamics of nutrients and features of their disproportionation in soil depending on hydrothermal conditions of the year. Methods. Field, laboratory-analytical, statistical analysis. Results. Essential variance is determined in seasonal dynamics of stores of mineral nitrogen and moisture of soil in years contrasting on conditions moisture security, in particular, in intensity of decrease of stores of mineral nitrogen during vegetation, ratio nitrate and ammonium nitrogen according to the profile of soil, and efficiency of use of nitrogen and moisture by plants. Conclusions. The gained results proved essential lowering activity of use of mineral nitrogen by plants in conditions of stressful drought and predominance in the structure of mineral nitrogen of its ammonium forms, especially in the end of vegetation. The effective use of nitrogen and moisture of soil takes place at optimization of root nutrition of plants due to importation of fertilizers, in particular, accumulation of residual phosphate in soil.