水稻的氮素营养,约有65～75%由土壤提供。研究土壤供氮状况,使其数学模型化,并用计算机编制最佳施肥方案,是十分必要的。前人利用土壤有效氮与田间试验结果的相关分析,作为估算施肥量的一种手段,但尚不能达到令人满意的结果(Frie 等1967年)。近年来 Stanford 等(1976年)证明,土壤矿物氮和作物吸收氮有很好的相 Nitrogen nutrition of rice, about 65 ~ 75% provided by the soil. It is necessary to study the status of soil nitrogen supply, make it mathematically model, and use computer to compose the best fertilization plan. The previous analysis of the correlation between soil available nitrogen and field trial results as a means of estimating the amount of fertilizer did not yet give satisfactory results (Frie et al., 1967). In recent years, Stanford et al. (1976) proved that soil mineral nitrogen and crop nitrogen uptake have a good phase