Growth and Yield of Soybean (<i>Glycine max</i> L.) as Influenced by Phosphorus

Abstract

The experiment was conducted to find out the influence of phosphorus (P) on growth and yield of soybean (Glycine max L., variety: G-2). The treatments were: control (P₁) and with the application of 50% (P₂), 75 % (P₃), 100 % (P₄), 125 % (P₅) and 150 % (P₆) of the BARC recommended dose of P. Nitrogen, K and S were applied as blanket as per BARC recommendation. Seeds were inoculated with Bradyrhizobium inoculum before sowing. All the treatments of P application showed higher growth than that of the control. P₅ treatment (11.25 kg P ha^-1) showed maximum growth and yield, which was 84.73% higher than that of control. The yield changed as a parabola curve with the increase of P application. The yield component, namely number of pods plant^-1, number of seeds pod^-1, pod weight plant^-1 and number of seed plant^-1 increased with the increase of P levels up to 11.25 kg P ha^-1. The application of P at 11.25 kg ha^-1 (25% higher over BARC recommendation) produced the highest seed yield of soybean (7.50 g plant^-1). So, for better yield of soybean in silty clay loam soil of Jahangirnagar University farm, application of P should be increased 25 % higher over BARC recommendation.

Key words: Soybean, Phosphorus, Growth, Yield

DOI = 10.3329/bjsir.v43i3.1151

Bangladesh J. Sci. Ind. Res. 43(3), 359-368, 2008