Comparative Studies on Effects of Nitrogenous Fertilizers on Growth, Fruit Set and Yield in Plum cv. Santa Rosa

摘要

The present investigation was carried out on Santa Rosa plum (Prunus salicina Lindl.) raised on wild apricot seedlings rootstock at 6 x 6 m spacing in the Department of Fruit Science, Dr. Y. S. Parmar University of Horticulture & Forestry, Solan during the years 2007-10. The purpose of these studies was to compare the effects of various sources of nitrogen on plum growth and yield to find out alternate source of nitrogen for the substitution of calcium ammonium nitrate (CAN), which was recommended inHimachal Pradesh. The seven sources of N viz., urea, ammonium sulphate, DAP+urea, calcium nitrate, 12 : 32 :16+urea, 10 : 26 : 26+urea and urea+lime were applied at three levels (400, 500 and 600 g N/tree) with four replications in a simple randomized block design (RBD). Half dose of nitrogen was applied during spring before flowering and remaining half dose was applied one month after first application. The highest growth, fruit set and yield were recorded with urea+lime (500 and 600 g N/tree). The lower dose was not as effective because it did not meet the N- requirement of the trees.