Effect of levels and sources of phosphorus under the influence of farm yard manure on growth determinants and productivity of soybean [Glycine max (L.) Merrill]

Field experiments were conducted during rainy season of 1997 and 1998 to evaluate the effect of phosphorus levels and sources with and without FYM in soybean [Glycine max (L.) Merrill]. Phosphorus application significantly enhanced growth determinants and seed yield of soybean. Application of 60 kg P₂O₅/ha significantly improved plant height, branches/plant, nodules/plant, nodule wt./plant, dry matter accumulation (DMA)/plant and seed yield over 30 kg P₂O₅/ha. The PARP and PARP+PSB application observed to be equally effective to SSP in terms of dry matter accumulation and seed yield. Application of FYM significantly improved various growth par:ameters except branches/plant and seed yield.