THE INFLUENCE OF AGROTECHNICAL CONDITIONS ON THE CONTENT OF SOIL MOBILE NUTRIENTS AND SPRING WHEAT PRODUCTIVITY UNDER THE CONDITIONS OF THE MODERATELY ARID FOREST-OUTLIER STEPPE OF THE ALTAI REGION
It has been found that the use of vetch-oat mixture, rape and millet as green manure contributes increasing the content of ammonium nitrogen, mobile phosphorus and exchangeable potassium in the soil in the first years after green manuring. The content of nitrate nitrogen in the soil increases both after bare fallow and in the variants with green manure on the second year of its aftereffect. The use of vetch-oat mixture and millet as green manure, as compared to bare fallow, increases the yield of spring wheat grain to 2.5 t ha in action and to 2.9 t ha in year 1 of the aftereffect. Among the basic tillage techniques, moldboard plowing contributes to greater accumulation of nitrate nitrogen and exchangeable potassium in the soil. Surface tillage increases the content of ammonium nitrogen and mobile phosphorus in the soil. Surface tillage with a disc harrow, as compared to other tillage variant involved in the experiment, contributes to increasing spring wheat productivity.