Response of Mung Beans (Vigna radiata) to Phosphate Application in Ultisols of Tripura - I. P Availability Indices

Infield experiments conductedfor two years (l990 and 1992) on Ultisols of Tripura, mung bean (Vigna radiata) responded to phosphorus. Mung, cv. MH-309, out of five tested cultivars, was highly responsive to P application. Of the various extractants used for indices of phosphorus availability, Bray's method gave the highest value. P application increased both P extractibility and P contents in mung bean grains. Correlation studies suggested Bray P₁, P₂, North Carolina P and Spurway P as suitable soil test methods to predict the P availability indices in acid upland soils of Tripura.