Critical limits of phosphorus in relation to the growth and dry matter yield of green gram (Vigna radiata L.) in acid soils of Kakching District
The Pharma Innovation Journal(2021)
摘要
In a pot culture experiment, the response of Green gram plants (Vigna radiata L.) cv. DGGS-4 to phosphorus was studied on twenty acidic soils of Kakching district, Manipur. The soils were found to be acidic with a mean pH of 4.98, organic carbon content 16.76 g kg-1, EC 0.22 dSm-1, CEC 14.01 cmol (p+) kg-1, and clay content ranged from 19.79 to 83.12 per cent. Dry matter yield in the plants increased significantly with the increase of phosphatic fertilizer application. The initial P concentration in plants as well the P uptake increased significantly with increase in phosphatic fertilizers. Bray 1 (r=0.774**) and Bray 2 (r=0.741**) extracted phosphorus was found significantly correlated with Bray’s per cent yield. The critical limits of phosphorus in soils were found to be 20 kg P2O5 ha-1 for Bray 1 extracted soil phosphorus and 26 kg P2O5 ha-1 for Bray 2 extracted soil phosphorus. The critical limit of phosphorus in plant tissues were found to be 0.43 per cent.
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