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Abstract
The first full and comprehensive attempt was made to standardize the time of sampling for the leaf nutrient diagnosis for Kinnow mandarin in North West semi arid zone of India by analyzing ten essential elements collected from spring cycle leaves. The samples were collected from February to January at monthly intervals for two years and the results revealed that the 6–7 month (August–September) old spring cycle leaves collected from terminal position of non- fruiting terminal is the best suitable time for foliar nutrient analysis in Kinnow mandarin grown in the North West India. In addition, the leaf nutrient concentrations of nitrogen and calcium of this period were best correlated and leaf phosphorus (P) and potassium (K) were least correlated with fruit yield by linear correlation analysis.