EFFECT OF PHOSPHORUS AND SULPHUR ON THE GROWTH, YIELD AND OIL CONTENT OF SOYBEAN

Abstract

A field experiment was conducted at Sher-e-l3angla Agricultural University Farm. Dhaka during the period from December 2008 to April. 2009 to evaluate the effect of? and S on the growth, yield and oil content of soybean. BARI soybean -5 was used as test crop. The experiment comprised four levels of Phosphorus viz. 0. 15. 30,50kg ha" and four levels of Sulphur viz. 0. 10,20,40kg ha". Altogether there were 16 treatment combinations and laid out following the Randomized Complete Block Design with three replications. Individual application of different levels of phosphorus and sulphur showed significant effect in relation to yield and yield attributes studied. Plant height, number of primary branch plant", number of leaves plant", stover yield. protein content and P,K, S content in plants, available N, P. K content in post harvest soil increased significantly up to 50 kg P ha" .On the other hand number of pods plant", number of seeds plant", thousand seed weight, grain yield, biological yield, oil content and N content in plant, available S content in post harvest soil were increased significantly by the application of P up to 30 kg P ha -1 . Effect of Individual application of P on the soil pH and the organic C content in post harvest soil was not significant. The desired yield attributes viz, plant height, number of leaves plant". number of pods plant". number of seeds plant", thousand seed weight, were increased significantly by the application of S up to 40 kg S ha -1 that were statistically similar with the results found at 20 kg S ha ' . So its wise and economic to use S @20 kg S ha". Protein content and total P. S content in plant, available N, P. K, S contents in post harvest soil were increased significantly at 40 Kg S ha", On the other hand, no of primary branch plant", grain yield, stover yield, biological yield, oil content, total N, K content in plant and organic C were increased at the rate of 20 kg S ha" in most eases. Interaction effects of phosphorus and sulphur on yield attributes were increased significantly. Most of the growth, yield attributing parameters found to he increased significantly by the combined application of 30 kg P ha" and 20 kg S