Effect of phosphorus, nitrogen fertilization and foliar applied manganese on yield and nutrient concentration of soybean

Publisher Website
Google Scholar
Abstract
A greenhouse experiment was conducted on clay loam soil of pH 7.8 to evaluate the effect of P, 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, 82.8 and 83.6% of the maximum yield obtained at the maximum calculated P level. The yield increase accounted 14.2 and 10.2% for N and Mn applications. In all treatments, in which P was combined with N, the seed yield was relatively higher than with P or N applied alone. P, N and Mn content in leaves and seeds were positively correlated with the applied nutrient fertilizers. At any given level of applied P and Mn, P content was significantly higher in +N than -N treatments. By Mn application, P content in leaves and seeds was decreased. P and Mn applications did not influence N content in leaves and seeds.