The present investigation aimed at evaluating the seasonality of macro-nutrients contents of pear trees during the agriculture year 2007. Therefore, leaf samples were collected at fortnightly intervals form 1st may to 1st October and evaluated for nutrients. In general concentration of N, P,K decreased and those of Ca, Mg, Fe, and Mn content increased from first to last sampling date while as no conspicuous trend was observed in Cu content of leaves. The distinct period of stability for N, Mg, Mn and Zn contents occurred from July 15- August 15. However, P content of leaves showed least variation from July 1 to august 1. While stability period for leaf Ca was recorded from August 1 to September 1. While Cu and B were found to be stable from June 1-July 15. It is as such suggested that the leaves should be sampled form middle portion of current season growth from periphery during most stable periods of a particular nutrient for its proper diagnosis. However in general, July to August is the most representative period for diagnosis of leaf nutrient content in the leaves. | Seasonal variation in leaf mineral nutrient and optimization of sampling dates for better indexing of pear leaf
