Infl uence of moisture supply conditions on the yield and feed value of soybean grain in symbiotrophic and autotrophic types of nitrogen nutrition

Abstract

The results of long-term studies on the effect of moisture availability of crops on yield, feed value, protein and oilseed productivity in soybean varieties of the northern ecotype (Mageva, Okskaya and Svetlaya) are presented. It was found that in the conditions of the Central Non-Chernozem region, soybean varieties of the northern ecotype provide maximum yield – 3.05 t/ha; protein content – 43.51%; fat content – 20.67%; protein collection – 1322 kg/ha; collection of essential amino acids – 833 kg/ha; fat collection – 531 kg/ha; collection of feed units – 4118 kg/ha. In years with excessive and optimal moisture supply, pre-sowing inoculation of seeds with the active strain 605b Rhizobium japonicum signifi cantly increases soybean productivity: yield – by 0.21-0.25 t/ha; protein content in seeds – by 2.11-3.35%; fat – by 0.33-0.57%; protein harvest – by 125-176 kg/ha; fat collection – by 43-72 kg/ha; collection of essential amino acids – by 84-111 kg/ha, including lysine – by 7-8 kg; collec tion of unsaturated fatty acids by 29-37 kg/ha; collection of feed units – by 305-348 kg/ha. It was found that 82-98% of nitrogen from its maximum consumption is absorbed by the agro enosis from the air due to symbiotic nitrogen fi xation.