Abstract:

Effects of nitrogen application on rice yield were studied in high fertility soil by using the field plot experiments at Nazhang Town, Malong County, Yunnan Province. The results indicated that the rice biomass production increased with nitrogen application rate in high fertility soil. When nitrogen application rate was less than 105 kg/hm2, the rice grain and straw output increased synchronously. When nitrogen application rate was greater than 105 kg/hm2, the straw increased rapidly in production, and grain yield decreased. With the increase of nitrogen application, the biomass and grain yields that generated by each additional 1 kg nitrogen input both decreased, and the grain yields decreased significantly greater than the biomass production.