Journal of the Indian Society of Soil Science

In a pot culture experiment with acid sedentary soils (Alfisols), three extractants were tested for their ability to predict the response of soybean to boron. Out of these, hot water and 0.01M CaCl₂ extractable boron in soils were positively and significantly correlated with Bray's per cent yield and tissue concentration of B inplants. The critical levels of soil available B extractable with hot water and CaCl₂ solution were 0.46 and 0.65 mg kg⁻¹ soil, respectively, below which soybean responded positively to B application. Critical concentration of B in soybean plants was 215 mg kg⁻¹. Boron application @ 1 mg kg⁻¹ in deficient soils was found to be optimum for soybean.