Phosphorus Status of Soils and Plants in Vineyards of Peninsular India

Grape nutritional survey conducted in Andhra Pradesh, Karnataka and Maharashtra indicated that large doses of applied P lead to heavy build up of soil P from 5 to 375 mg kg⁻¹ soil in Anab-e-Shahi and 5 to 500 mg kg⁻¹ in Thompson Seedless vineyards. The optimum soil test norms for grape were developed (47 to 255 mg kg⁻¹ soil for Anab-e-Shahi and 54 to 122 mg kg⁻¹ for Thompson Seedless). DRIS (Diagnosis and Recommendation Integrated System) brought out the causes of low productivity based on relationship of petiole nutrient status with the yield. In many cases low P was the cause of low yield when potential yield was determined. Recommendation of 582 kg P20S to Anab-e-Shahi and 520 kg P₂O₅ ha⁻¹ for Thompson Seedless cultivar is made for optimum yield.