Effect of Spraying with Triacontanol and Adding Humic acid on the Chemical Content of Pear Seedlings Pyrus Cimmunis L. Cv. Le-Conte

Abstract

Abstract This study was conducted at the research station of the College of Agriculture, Anbar University in 2022 to investigate the effect of foliar application of triacontanol at concentrations of 0, 25, 50, and 100 mg L−1, symbolized by T0, T1, T2, and T3, respectively, and the addition of humic acid to the soil at concentrations of 0, 25, and 50 mg L−1, symbolized by H0, H1, and H2, respectively, on some chemical growth characteristics of Le-conte pear seedlings. The results showed significant differences among the treatments, where the addition of the growth regulator triacontanol at treatment T3 (100 mg L−1) resulted in a significant superiority in the carbohydrate content the leaves (6.18%), nitrogen content the branches (2.207%), nitrogen content the leaves (1.937%), carbohydrate content the branches (13.378%), phosphorus content in the branches (0.367%), and phosphorus content the leaves (0.347%). On the other hand, the effect of humic acid showed significant superiority at treatment H2 (50 mg L−1) in the carbohydrate content the leaves (5.49%), nitrogen content the branches (2.160%), nitrogen content the leaves (1.908%), carbohydrate content the branches (12.858%), phosphorus content the branches (0.341%), and phosphorus content the leaves (0.338%). the results showed that the interaction between the study factors was significant, with superiority of the treatment T3H2 in all the studied characteristics.