Influence of fertilizer system on the dynamics of nitrogen content and balance on newly developed lands

Abstract

Under the conditions of the North-West region, the influence of fertilizer systems and precursors on the dynamics of the accumulation of easily hydrolysable nitrogen and the balance of its total content during the development of unproductive sod-podzolic soils of light granulometric composition was studied. For an eight-year research period, the mineral fertilizer system in the cultivation of barley at the planned yield (40 kg/ha) does not compensate for the loss of easily hydrolysable nitrogen. The organo-mineral system (40 t/ha of organic fertilizers or 100 m3/ha of liquid wastewater from livestock complexes) contributes to an increase in the content of easily hydrolysable nitrogen in the arable soil layer by 2.5 … 5.1 and 2.1 … 5.2 mg/kg of soil, compared to control. Stabilization of the balance of the total nitrogen content occurs with an annual application of 6.9 … 7.2 t/ha of solid fraction of manure or 35 … 37 m3/ha of liquid effluents and expanded reproduction of soil fertility is ensured with the incorporation of 9.7 … 11.0 t/ha solid fraction or 49 … 52 m3/ha of liquid waste. The most intensive accumulation of easily hydrolysable nitrogen is observed when using spring rape as a precursor, on the background of which the highest yield of barley was also obtained.