Effect of Phosphorus and Nitrogen Fertilization and Foliar Applied Manganese on Yield and Nutrient Concentration of Soybean, Glycine max. (L.) PDF

Keywords

greenhouse, soil, phosphorus, nitrogen

Abstract

A greenhouse experiment was conducted on clay loam soil of pH 7.8 to evaluate the effect of P and N fertilization and foliar applied Mn on yield and nutrient concentration in leaves and seeds of soybean. A significant yield increase was obtained for each added increment of P fertilizer up to 30 kg P2O5/acre. At application rates of 0, 15, 30 and 45 kg P2O5/acre, the seed yield was subsequently 27.8, 65.8, 84.8 and 83.6% of the maximum yield obtained at the maximum calculated P level. The yield increases were 14.2 and 10.2% due to N and Mn applications. In all cases, in which P was combined with N, the seed yield was relatively higher than with P or N applied alone. Phosphorus, N and Mn concentration in leaves and seeds were positively correlated with the applied nutrient fertilizers. At any given level of applied P and Mn, the P concentrations were significantly higher in +N treatment than -N treatment. Phosphorus concentration in leaves and seeds decreased by Mn application. While P and Mn applications affected the Mn content of both leaves and seeds, they did not influence the N%