The balance of nitrogen in soils of field crop rotation when a 50-year application of fertilizers

Abstract

The results of studies conducted in long-term stationary field experiments Department of Agricultural Chem­ istry and Soil Science at podzolic heavy clayloam chernozem of Right-Bank Forest-Steppe Ukraine on the effect of different rates of fertilizer and systems including the biological direction, in the direction of the main nutrients and balance in crop rotation.
 It is found that the removal of nitrogen in field crop rotation depending on the doses of fertilizers were 82,4–136.2 kg/ha at the stem in the control variant without fertilizers – 63,5 kg/ha. Found that the saturation of crop rotation with clover and peas the minimum optimal rate of nitrogen balance is formed during the introduction on 1 hectare square field rotation N45P45K45 or manure 4,5 t/ha + N23P34K18 with intensity respectively 75 and 70 %. In the application of organic fertilizers system, depending on the doses of manure, he had the allowable deficit and its intensity was 77–88 %. A balanced nitrogen balance is formed when you make N 90-135Р90-135К90-135 and manure 13.5 t/ha + N68Р101К54 on an area of 1 ha, respectively, with the intensity of the 115, 123 and 116 %.