Effects Of Paclobutrazol On The Biological Characteristics And Yield Of Spring Peanut

Peanut seeds were soaked with different concentrations of paclobutrazol for 24 hours before germination and different concentrations of pacJobutrazoJ were sprayed on leaves of peanut at fully flowering stage in the experiment. The major agronomical characteristics were investigated, and some physiological and biochemical characteristics in the leaves of peanut were determined at different stages, and plant growth and yield of peanut were investigated. The main results were as follows:1. Soaking the seeds with different concentrations of paclobutrazol delayed the germination of the seeds, resulted in lower germinating rate and shorter plan height of peanut.2. The treatments with suitable concentration of paclobutrazol sprayed on leaves of peanut at fully flowering stage optimized some physiological and biochemical characteristics in the leaves . It was showed that the paclobutrazol treatments increased obviously the contents of protein and chlorophyll in the leaves, and improved the rates of photosynthesis and transpiration of the leaves, and increased the activity of the roots, but decreased the content of MAD in the leaves.3. The treatments with suitable concentration of paclobutrazol sprayed on leaves of peanut at full flowering stage restrained growth of the above-ground parts of the plants, resulting in shorter stems and branchs height were shorter, but more branches. Three weeks after spraying paclobutrazol, the fresh weight and dry weight per unit of leaf area and per plant increased.4. At harvest, the quantity of pods, the percentage of plumy pods and the peanut yield were higher in the paclobutrazol treatments than that in the control. The highest peanut yield was found in the treatment sprayed with 150 tag. I-1 paclobutrazol, which reached 3806.25 Kg. (hm3) ', and increased by 12.57% as compared with the control.