Four varieties including Longjing43,Zhenong113,Jiukeng and Wuyangzao was taken to sutudy on effects and mechanism of chitosan on development and rhizosphere of tea plant by field and pot experiment.The results showed as follows:1. Chitosan could accelerate sprouting and growth of tea plant,and increase average weight of one hundred sprouts and density of sprouts and yield of tea by spraying before sprouting of tea plant.Chitosan treatments compared with control,the density of sprouts increased 4.39%~8.88%,...