据报道,1965年前后,日本水稻单产停滞不前,以致米的自给率降低,原因之一是以基肥为主,忽视了生育后期的施肥,以致成熟不良。后来改进了施肥技术,采用新的施肥法(如 V字栽培法,深层追肥法等等),减少了基肥的用量,不致初期生长过于旺盛,减少无效分蘖,防止倒伏;注意施用穗肥及粒肥,使后期光合作用进行良好,结实率提高,千粒重增加,以致 It is reported that around 1965 Japan’s rice yield stagnated so that the self-sufficiency rate of rice was reduced. One of the reasons was that the base fertilizer was the main one, ignoring the fertilization in later growth period and leading to poor maturation. Later improved fertilization technology, the use of new fertilization methods (such as V cultivation method, deep dressing method, etc.), reducing the amount of basal fertilizer, growth will not be too strong early, reducing ineffective tillers, to prevent lodging; attention to the application of panicle fertilizer and fertilizer , So that the late photosynthesis good, seed setting rate increased, 1000 grain weight increased, so that