Effect of spraying with different levels of ascorbic acid and yeast extract on the vegetative growth and yield of pear trees (Pyrus communis l.)

摘要

©@ EM International.This study was carried out in a private orchard in Daquq district-Kirkuk province on nine-year-old “LeConte” pear trees in 2020 growing season, to investigate the effect of spraying with three levels of ascorbic acid (0, 75 and 150mg l-1, three levels of dry yeast extract (0, 2 and 3 g l-1) and their interactions. The study was conducted according to Randomized Complete Block Design (RCBD) with three replicates, one tree was used as an experimental unit. The data were analyzed statistically and the means were compared according to the Duncan polynomial test at 0.05 probability. The results indicated that foliar spray of 150 mg L-1as corbic acid treatment and its combination with yeast extract 3 g l-1 treatment increased significantly the shoot length, leaf area, chlorophyll content, TSS% in fruit, fruit set %, number of fruits per tree, fruit weight and yield of tree and Feddan. On the other hand, Foliar spray of yeast treatments had not affected on any studied characteristics except 3 g L-1 increased statistically TSS% in pear fruit comparison to the control treatment.