Effect of organic and inorganic sources of phosphorus for enhancing productivity and phosphorus use efficiency in blackgram under acid soils

Phosphorus (P) is a fundamental mineral nutrient for crop development and essential in vital physiological processes in pulses. However P availability is restricted to crops because of various reasons. Hence developing solutions for enhancing the bioavailability of P will helps to improve the production of pulses. With this rationale, field experiments were conducted at National Pulses Research Center (NPRC), Vamban during kharif and rabi (2016 to 2018) to study the effect of phosphorus and bioresources viz, phosphobacteria and Arbuscular Mycorrhiza along with Rhizobium on growth, yield and soil nutrient status and economics of blackgram under acid soil condition. The results revealed that, soil based application of inorganic phosphorus @ 50 kg ha−1 + Rhizobium and phosphobacteria each @ 2 kg ha−1 + Arbuscular Mycorrhiza @ 50 kg ha−1 increased yield (941 kg ha−1) which is 20.29% higher than application of P2O5 @ 50 kg ha−1 + Rhizobium and phosphobacteria each @ 2 kg ha−1 (750 kg ha−1). Hence, application of both organic (Rhizobium, phosphobacteria and Arbuscular Mycorrhiza) and inorganic phosphorus resources is better for effective utilization of applied phosphorus for good pod development and yield in a sustainable way for acid soils under alfisol condition.