Effect of Paclobutrazol Application on Growth of Mango Trees and Detection of Residues in Leaves and Soil.

概要

論文の詳細を見る
The study was conducted to analyze the effect of paclobutrazol application by several methods on the vegetative and reproductive growth of mango trees, and to detect its residues in the leaves and soil. Paclobutrazol was applied to'Nam Dok Mai'as (1) foliar spray at 1, 000 ppm, (2) foliar spray at 1, 000 ppm and covering of soil underneath the canopy with a plastic sheet allow the chemical to penetrate only through the leaves, (3) soil drenching at a level of 8 grams/tree and (4) trunk injection at a level of 400 mg/tree. Soil drenching was most effective in suppressing shoot elongation. Flowering ratio in the trees subjected to all the paclobutrazol treatments was higher than that of the control, but the fruit set only slightly increased by these treatments. Paclobutrazol remained in the soil up to 11 months when it was applied to soil and three months in foliar spray without soil cover. No residues were detected in the soil when paclobutrazol was applied by foliar spray and covering of the soil as well as trunk injection. The level of the residues was high in the leaves subjected to foliar spray, while it was considerably low in the case of soil application and trunk injection. In all the treatments, no chemical residues were detected in the mature fruits.
日本熱帯農業学会の論文