水稻各生育期定量施用化肥,特别是定量施用氮化肥,是大面积生产实际提出的一大难题,这一问题由来已久,但就国内外现有资料看,大都提些施肥原则,如V形施肥法,片仓法,我省多年提的促控原则,近年盛行“配方施肥”或依据植株诊断结果指导施肥等等。指挥生产,一般依据本地经验来 The quantitative application of chemical fertilizers during the whole growth period of rice, especially the quantitative application of nitrogenous fertilizer, is a big problem actually put forward in large-scale production. This problem has existed for a long time. However, based on the available information at home and abroad, Fertilization method, the film warehouse method, the province for many years to mention the principle of promoting control in recent years, prevalence of “formula fertilization” or based on the diagnosis of plant fertilization guide and so on. Command production, generally based on local experience