Budget of fertilizer nitrogen in irrigated agroecosystems of theforest-steppe zone of western Siberia

摘要

Budget parameters of mineral fertilizer nitrogen were established upon the cultivation of annual (vetch-oat mixture and Sudan grass) and perennial fodder cultures (alfalfa and Hungarian brome over three years of growing) under irrigated conditions in western Siberia. The consumption of exogenic nitrogen by plants, including accumulation in root and stubble residues, its retention in the soil, and gaseous losses were studied.