Standardization of leaf sampling technique for macro-and micro-nutrient elements in plum under temperate conditions

Macro-and micro-nutrient elements content as influenced by leaf age and its position on the shoot was studied to determine leaf sampling time for plums grown in temperate region. The results revealed that middle leaves were the most suitable tissue for determining needs of plum trees. Leaf samples should be collected from June 15 to July 15 for determining N, P, K and Ca and from July 1 to July 15 for determining Zn and Cu. For the determination of Mg and Fe in plum leaf, samples should be collected from June 1 to June 15 and August 1 to August 15, respectively.