Changes in the nitrogen status of grey forest coarse dusty light loam soil under different systems of fertilisation and chemical amelioration

This paper presents the results of research in a stationary experiment, launched 1992 on grey forest coarse-dusty light loamy soil, aimed at studying influence long-term chemical amelioration and various fertilisation systems (mineral, organic, organic-mineral) nitrogen regime. Nitrogen is extremely important agriculture, as all growth processes, photosynthesis, metabolism, yield volume quality eventually depend this element. In Ukraine, share soils woodland composition total soil cover exceeds 33%, while agricultural land 25%. Since humus content its reserves are an integral measure formation key characteristic that determines overall habitat article analyses changes response to above factors. It has been found gross reflects content, fully depends varies with latter. There high correlation between these indicators for variants experiment (r = 0.991). The data obtained indicate only use green manure by-products predecessor moderate doses mineral fertilisers combination liming, there increase compared initial level. rise amounted 0.36 – 0.45 t/ha case, it possible observe extended reproduction. Only after mineralisation does organic compounds become available plants. easily hydrolysed form fairly reliable indicator whether plants supplied According classification, under study, mobile compound 81.2 103 mg/kg, falls into group very low degree nutrient supply, but hydrolysis matter (9.6 10.2%). With combined manure, non-commodity crop products, one-dose along lime, increased by 27.5% control. Under fertiliser complex, was 16.5 mg/kg amount N-N03-+N-NH4+ control, plus 7.4 nitrification capacity