DRIS norms for sapota in western plains of India

A leaf sampling survey was conducted in existing orchards of sapota in Valsad, Navsari, Junagarh and Bhavnagar districts of Gujarat during 1999 and 2000 to develop DRIS norms. The optimum nitrogen concentration in the index leaf ranged from 1.25–2.38%, whereas phosphorus, potassium, calcium, magnesium, sulphur, iron, manganese, zinc and copper, ranged from 0.05–0.17%, 0.36–0.77%, 1.01–2.04%, 0.48–0.92% and 0.38–0.82% and 18.9–147.43 ppm, 18.12–36.97 ppm, 7.89–16.57 ppm and 3.92–5.66 ppm respectively. These findings may be used for diagnosis of nutrient requirements of sapota orchards in Gujarat.