The effects of the spraying double-promoting regulator (DPR) on nitrogen metabolism characters and grainprotein yield in different soils are studied.The results show that DPR can obviously improve ability of nitrogenmetabolism in functional leaves and steam-sheaths of rice in stage of reproductive growth, and enhance the contents of protein N in grain and brown of rice.Compared with treatment CK,the grain protein yield of treatment DPR of early rice and late r...
