Research on rice higb-yielding culture mode with applng fertilizer in extractive quantity to control nonpoint-sonr cepollution

Using the orthogonal quadratic regression design method，a cultivation technology mod e to retain rice high yield with applying fertilizer in extractive quantity is studied，and a numeric mod e of the density of rice planting，quantity of ap-plyirlg N and quantity of applying P is established，the results show that the theorical maximal yield of rice is 9211.5kg／hm² when the planting density of rice is 209628 clumps／hm²，the application amounts of N and P are 379.05kg／hm²and 476.85kg／hm²，respectively．