Leaf nutrient standards for mango (Mangifera indica L.).
Pramod Kumar, Rehalia A. S., Sharma S. D., Amit Kumar
Author Affiliation: Rashtriya Chemicals & Fertilizers Limited, Chember, Mumbai, India.
Environment and Ecology 27 : 692-698
Abstract : The present investigations on standardization of leaf nutrient norms in mango orchards cv Dashehari located in Himachal Pradesh were carried out during 2004 and 2005. The studies were undertaken with the objectives to find out the nutritional status of mango orchards and to establish nutrient standards for leaf based on orchard surveys. The survey was carried out on trees of 15 years age group. Four districts of Himachal Pradesh viz. Kangra, Una, Hamirpur and Bilaspur, being major mango growing districts were selected according to probability proportional to size of sampling scheme. Five representative orchards from each district were selected. Optimum sample size of 10 trees from each orchard based on average national productivity i.e. >90 kg/tree were selected to standardize the nutrient ranges. Nutrient content of leaf varied from 1.87-2.34% nitrogen (N), 0.117-0.157% phosphorus (P), 0.584-0.800% potassium (K), 1.80-2.46% calcium (Ca) and 0.79-1.37% magnesium (Mg). It is concluded that for sustainable production of Dashehari orchards under agro-climatic conditions of Himachal Pradesh, the nutrient content of leaf should be in the range of 1.87-2.33% N, 0.118-0.156% P, 0.585-0.796% K, 1.94-2.44% Ca and 0.81-1.36% Mg.