[原理] 水稻在体内合成并蓄积淀粉,其数量和氮的营养状况有密切的关系,氮能很好的发挥效能时淀粉的蓄积量少,氮不足时则淀粉的蓄积量多。日本农林省农业技术研究所村山,川原崎二人,根据对淀粉反应的调查,明确地判断出是 [Principle] Rice synthesizes and accumulates starch in the body. The quantity of nitrogen is closely related to the nutritional status of nitrogen. When nitrogen can exert its effect well, the accumulation of starch is small, while when nitrogen is deficient, the accumulation of starch is large. Japan’s Ministry of Agriculture, Forestry and Agricultural Science Institute Murayama, Kawasaki Kawasaki, according to the investigation of starch response, clearly determine is