关键词: 寒地, 水稻, 实地氮肥管理, 产量, 干物质, 氮肥利用率

Abstract: Experiments of two fertilization methods, site-specific nitrogen management (SSNM) and farmer’s fertilization practice (FFP), were conducted to solve the problem of excessive N application on rice in cold area, and to study their effects on dry matter accumulation of rice, the chlorophyll meter values (SPAD values) in leaves, tiller number as well as yield. Experiment results showed that compared with FFP, SSNM significantly decreased the average N rate by 33.8%, increased dry matter weight after heading period by 4.3%~29.1%, and increased filled grain rate and 1000-grain weight by 0.1~12.5 percent point and 0.3~1.8g correspondingly, as well as increased average yield by 4.3% and 14.7%(P < 0.05) in 2004 and 2005 respectively. There were significantly positive correlations(P<0.01) between dry matter weight after heading period and yield, and accumulation rate of dry matter makes rice yield increase. The result suggested that SSNM is an outstanding achievement in N application in cold area of Northeastern China, and is a valid agriculture approach.

Key words: cold area, rice, site-specific nitrogen management, yield