The results showed as follows:1 When DPR was sprayed in early rice and late rice during reproductive stage of rice growth, it could improve chlorophyll contents and net photosynthetic rate of functional leaves.

• 在水稻齐穗后，喷施DPR能够提高早、晚稻功能叶叶绿素含量，增加功能叶的光合强度。