Abstract: The present report is the second part of a series work on the application of gibberellin on rice-plant. The effects of this growth substance applied at vegetative period were summarized as follows: The emergence and growth of tillers are important characters of rice-plants at vegetative period. In order to improve the features of tillers such as the earliness of tillering, the qualities of the tillers, the percentage of mature panicles among total tillers and the maturity and economic yields, the authors applied this growth substance at vegetative period by foliar spray. The results show that gibberellin acts on the rice-plant in two-fold manner, it promotes the emergence of the main stems and the tillers to form bigger panicles soon after transplanting and inhibites the emergence and growth of the small latter tillers, then the number of tillers per area eon- trolled and a higher yield may be obtained if this chemical is applied at the right time. The factors which influence the yields were: the control of the emergence of latter tillers, the decrease of ineffective tillers, the increase the output of the small tillers, concentrateion of the assimilates into the main stems and early formed tillers, and consequently bigger and more fertile panicles were formed. At the same time, such treatment may hasten the heading of young panicles and accelerates the processes in the filling of grains and early maturity. In order to obtain a higher yield and early ripe, as a rule, there are factors one must bear in mind: First, the time of application, it is suitable take to give the treatment at the end of effective-tiller stage, which is near the maximum tillering stage, about 20 to 25 days after transplanting. This above mentioned stage is earlier in spring varieties than autumn ones, and earlier in early duration varieties than late duration ones. Second, the concentration of gibberellin, 10 ppm are quite proper for spring varieties and 20 ppm for autumn ones. The Japonica varieties may need a higher ppm than the Indiea varieties. Finally, the number of fondamental seedlings per area must be more than the ordinary paddy fields in order to compensate the possible shortage of panicles by this treatment.