The lnfluence of Paclobutrazol on Walnut Trees

The effects of different treatments on vegetative growth and yieldof walnut, and the practice of applying paclobutrazol to walnut were determined in this study. High concentrations of paclobutrazol could effectively reduce the vegetative growth and increase the yield of walnuts, but if theconcentration was too high, the yield would decrease.In this research, 2000 ppm for foliar spray and 3 grams for soil drench would be the suitable concentrations which could get the highest yield.The best stage for treatment wasat the early stage of shoot growth. For the same dosage, if it was applied intwice, it could achieve better results than only one time. Compared with foliarspray, the soil drench was a relatively effective method.