The study aimed to examine the inoculation of Rhizobium bengladensis and Pseudomonas sp. on the nodulation, growth, enzymatic activity, phosphorus uptake and yield of black gram in P deficient soil. The experimental findings revealed that the combined inoculation of Rhizobium bengladensis @ 10 ml kg-1 seed+Pseudomonas sp. @ 10 ml kg-1 seed+75% NP +100% K yielded the highest nodulation (42), plant height (43 cm plant-1), available N (154.96 kg ha-1), available P (16.77 kg ha-1), available K (278.20 kg ha-1). This treatment was also found statistically (p≤0.05) at par with the application of Pseudomonas sp. @ 10 ml kg-1 seed+ 75% P+100% NK for root nodulation, plant height, available NPK. As for grain and straw, the nutrient content showed non-significant effects for all the treatments while the nutrient uptake was observed to be highest in the treatment including the combined inoculation of Rhizobium bengladensis @ 10 ml kg-1 seed+Pseudomonas sp. @ 10 ml kg-1 seed+75% NP+100% K. The grain yield (11.83 q ha-1), stover yield (26.70 q ha-1) and biological yield (38.53 q ha-1) was found to be highest in the treatment including combined inoculation of Rhizobium bengladensis @ 10 ml kg-1 seed+ Pseudomonas sp. @ 10 ml kg-1 seed+75% NP+100% K. Hence, these inoculants can be recommended to increase the yield of black gram while mitigating the effect of P deficiency in low P soil.
Rai et al. (Fri,) studied this question.