Effects of Ethephon and Paclobutrazol on Growth and Yield of Mungbean cv Kamphaeng Saen 1

Abstract

The effects of soil drenching and foliar applications and concentrations of ethephon and paclobutrazol on growth, biochemical changes and yield of mungbean cv. Kamphaeng Sawn 1 were determined. Application of paclobutrazol markedly retarded plant height, However, plant dry matter accumulation (stem and root) and yield components (pod and seed weights) were improved as compared with the untreated plant. Application of ethephon tended to increase greater dry matter accumulation and yield components of mungbean as compared to that of paclobutrazol and the untreated plant. Soil drenching application of either ethephon or paxlobutrazol was more efficient in improving plant growth and yield than foliar application. The optimum concentration of plant growth regulators to be used in mungbean was 200 ppm. Ethephon and paclobutrazol did not significantly increase the accumulation of nitrogen and phosphorus in the shoot of mungbean, where as in the root, nitrogen and phosphorus accumulations were increased in response to paclobutrazol treatment. Chlorophyll content was also found to be higher in the leaves of paclobutrazol-treated plants.