Effects of Variety, Inoculum and Phosphorus on the Performance of Soybean
Effects of variety, Bradyrhizobium inoculum and phosphorus on soybean were studied through an experiment at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from August 26 to November 30, 2001 with the views to observe the performance of soybean varieties using Bradyrhizobium inoculum and phosphorus fertilizer and thereby to select suitable soybean variety(s) with its optimum dose inoculum and phosphorus. Three varieties of soybean viz., Shohag (Pb-1), BS60 and BS16 were tested using two levels of Bradyrhizobium inoculum viz., 0 and 30 g kg-1 seed and three levels of phosphorus viz., 60, 72 and 84 kg P2O5 ha-1 in a split plot design with four replications. The varieties were accommodated in main plots and six combinations of inoculum and P2O5 were assigned to the sub plots. The single effect of variety, inoculum and phosphorus indicated that significantly the highest seed and stover yield was obtained from Shohag, using inoculum and higher dose of phosphorus. The combined effect of variety and inoculum was significant in respect of branches per plant, seed per plant, empty pod per plant, nodules per plant and seed yield and that of variety and phosphorus was significant only in case of empty pod per plant, nodules per plant and seed yield. That is the seed yield, nodules and seed per plant of Shohag increased with inoculum and higher dose of phosphorus except empty pod per plant both the cases. Though there was no significant differences in respect of all the characters studied except empty pod per plant and nodules per plant due to combined effect of inoculum and phosphorus; and variety, inoculum and phosphorus an increased trend was observed in all the studied characters except empty pod per plant. However the variety, Shohag gave the highest seed yield (2.29 t ha-1) using inoculum and the highest dose (84 kg ha-1) of P2O5. The over all results implies that the variety, Shohag in combination with inoculum at the rate of 30 g kg-1 seed and 84 kg P2O5 ha-1 can be grown planting on August in puddle soil for higher yield of soybean.
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