关键词: 氮转化, 氮转化

Abstract: In order to excavate the influence of cultivation techniques on improving rice yield, and find out the limiting factors of improving rice yield, the author discussed the weight of cultivation techniques to rice yield per unit area. The related data of the yield per unit area of rice from 1981 to 2010 and the new rice varieties authorized by Sichuan Province from 2001 to 2010 were analyzed. The results indicated that, the overall level of hybrid rice breeding in Sichuan Province was raised to a new stage from 2001 to 2010, however, the yield per unit area of rice was stagnated in 10 years.It Suggested that, the update of varieties could not break through the yield per unit area recently, the complete set of improved breed and cultivation, as well as the research and utilization of high-yield farming system might be the key factor to restrict the yield per unit area of rice. The weight of cultivation techniques was estimated by the Analytic Hierarchy Process, and the result indicated that, fertilization technique > seed selection > irrigation method > planting density > pest and disease control > chemical control measures > seedling-raising method, while there was no significant difference between the basic index layer of fertilization technique, chemical control measures and seedling-raising method, which suggested that the blindness of the utilization of these techniques might still exist in rice production, the research and extension of these techniques in rice cultivation should be strengthened in future.