Effect of Phosphorus, Sulphur and Phosphate Solubilising Bacteria on Yield, Nutrient Uptake and Soil Fertility After Harvest of Mustard

摘要

A field experiment was conducted to evaluate the effect of phosphorus, sulphur and phosphate solubili/ing bacteria on growth and nutrient uptake by mustard {Brassica juncea (L.) C/ern and Cosson.) in loamy sand soil. The experimental plan adopted was RBD factorial design with four replications. The treatments comprising of three levels each of phosphorus (0, 25, 50 kg P2O5 ha~(-1)) and sulphur (0, 20, 40 kg S ha~(-1)) and two levels of phosphate solubili/ing bacteria (PSB) inoculation (no inoculation and inoculation with Aspergillus niger strain-1) during Rabi seasons of 2004-05 and 2005-06. The results of the experiment revealed that each successive increase in level of phosphorus significantly increased the crop growth and uptake of nutrients. Different levels of sulphur significantly improved the growth, yield as well as uptake of nutrients by seeds and straw of mustard. Seed inoculation with PSB (I1) significantly increased yield, uptake in seed and straw and availability of nutrients in soil. Combined effect of 50 kg P2O5 ha~(-1) and 40 kg S ha~(-1) with seed inoculation with PSB gave higher seed and straw yield as well as nutrient content in seed and straw which resulted in higher nutrient uptake by mustard grown in loamy sand of North Gujarat.