A Comparison of Nitrogen Sources and Rates on Mineral Composition of Mango Seedling Leaves

Ammonium sulphate, calcium nitrate and urea were applied to mango seedlings for comparison on chemical composition of leaves. Urea had significantly increased the N and carbohydrate content and calcium nitrate had increased the Ca and K content. Increasing levels of fertilizer significantly increased the N, P and carbohydrate content while decreased K, Ca and C/N ratio gradually. Interactions between source and levels showed a significant difference with only Ca and K content. On the whole urea at 20 gm/pot (45 × 30 cm) proved helpful for most of the characters of mango seedling followed by calcium nitrate in order of usefulness.