National Research Centre for Citrus, Amravati Road, Nagpur - 440 010, India.
Availability of leaf and soil nutrient guide suiting to specific soil, climate and cultivar is a pre-requisite for an efficient nutrient management in perennial crops with citrus no exception. Top citrus orchard productivity is obtained on sustained basis only in those areas practising leaf or soil nutrient guides based fertilization programme. Highly varied recommendations have emerged regarding various limits viz., deficient, low, optimum, high and excess level of either leaf nutrients concentration or soil available nutrients. The review highlighting the various available nutrient norms and soil fertility indices developed world over during last 50 years or so, have been systematically discussed alongwith conditions under which these indices hold maximum utility using citrus as an exclusive test crop.
