Abstract: This study is based on the Stanford equation and aims at getting high yield and high quality rice. With the aid of stage and monomial method of quantitative determination, the three parameters of the precise and quantitative N application theory and technology were measured and validated. In the process of study new, methods and route were found preliminarily, such as a new method for determination of the amount of N requirement by grading the yield of a field, a new route to study by demarcating the N supplied by organic fertilizer to the N supply ability of a field and the great effect of the ratio of N applied as basal fertilizer and that as panicle fertilizer on the NUE was proposed. The research has solved the technology of precise and quantitative N application of total amount of N and its splitting application, thus enabling the application of this technology and supporting the application of "3S" technology.

Key words: Rice (Oryza sativa L.), Stanford equation, Precise and quantitative N application, Yield grade, Ratio of stage N application