Vol. 10, Issue 9 (2021)

Author(s):
Nakeertha Venu, N Surbala Devi, Athokpam Herojit Singh, K Nandini Devi, N Gopimohan Singh and Trishanku Kashyap

Abstract:
Rock phosphate (RP) is one of the cheap sources of P but it cannot be used directly as a soil amendment due to its extremely poor solubility in water (0.1%). However, the availability of Phosphorous from RP can be enhanced by applying it with lime and through the specific use of bio-inoculants. A pot experiment was conducted in the Department of Soil Science and Agricultural Chemistry, College of Agriculture, Central Agricultural University, Imphal during the Pre-Kharif season of 2021 to study the influence of Rock Phosphate, Phosphorous Solubilizing Bacteria and lime on phosphorous content and dry matter yield of Green Gram (var. DGGS-4). Results revealed that all the P treatments showed higher accumulation of plant P concentration and plant dry weight of green gram when compared to control. Comparing among the different treatments, statistically higher accumulation of plant P concentration and dry weight were recorded in soil treated with T₁₀ (100% RD of P₂O₅ from RP + PSB₁ +PSB₂ + Lime (18.71t ha^-1) followed by T₉ = 100% RD of P₂O₅ from RP + PSB₂+ Lime (18.71t ha^-1). Application of rock phosphate in combination with PSB and lime enhanced organic P mineralization thereby increasing plant P concentration and dry matter yield of green gram.