This paper is an attempt to study the effects of several plant growth regulators on rice nitrogen metabolism, which serves as the theoretical basis for exploiting new plant growth regulators.Two new plant growth regulators with significant effects are selected from them. The results show that there exist great the differences of nitrate reductase activities, glutamine synthetase activities and glutamine transferase activities in functional leaves and glutamine synthetase activities , glutamine transferase activities in grain among the treatments in early milk stage. Then these differences grow...
