The increase trend of the contents of total N and protein N in grain of early rice and late rice were observed during reproductive stage of rice growth. And their magnitudes of increase were higher in DPR than CK.

• 早、晚稻籽粒全氮和蛋白氮含量呈上升的变化趋势，而当用DPR处理后其均高于相应的对照。