Nitrogen regime of the developed sod-podzolic soils of the Non-chernozem region in the grain-tilling fruit-changing crop rotation under different fertilizer systems and cultivation

Abstract

The purpose of the research is to study the effect of multi-depth sealing of crushed straw-crop residues of field crops, calculated doses of mineral fertilizers for the planned crop yield, as well as organic waste from the pig complex used as the main fertilizer on the nitrogen regime of degraded soils along the layers of the root-inhabited horizon. The effect of different-depth incorporation of crushed straw-crop residues of field crops, calculated doses of mineral fertilizers for the planned crop yield, as well as organic waste from the pig complex used as the main fertilizer on the nitrogen regime of degraded soils along the layers of the root-inhabited horizon has been studied. The studies were carried out during the repeated development of degraded sod-podzolic soils of the North-West region of the Non-Chernozem zone of light loamy granulometric composition. It was established that according to the degree of influence of the studied factors on the content of easily hydrolyzed nitrogen, they can be arranged in order of decreasing efficiency as follows: fertilization system (factor A) → method of incorporation of fertilizers (factor C) →crop rotation cultures (factor B). It is proved that during the rotation period of the five-field crop rotation, the complex influence of the studied factors determines the intensity of accumulation of easily hydrolyzed nitrogen in a layer of 0-40 cm in the range of 58.8…75.3%. The remaining 41.2…24.7% of the changes are associated with other nitrification factors, and primarily with the microbiological activity of the soil in the conditions of changing agro-climatic resources of the region.