作为作物营养研究手段的水培法研究已有较久历史。森英男氏是于1943年最早开始果树水培法的日本研究者。后是构沟等氏。但多采取习惯的通气水培法。近年来,冈田氏考虑到通气法存在后期容易造成烂根、生长不良的问题,他在总结以前水培经验的基础上,采取了营养液间歇循环法。通过六年的实践,证明这种方法,与通气法相比,不易烂 The study of hydroponics as a research tool of crop nutrition has a long history. Mori Young is the first Japanese researcher to start fruit tree hydroponics in 1943. After the groove ditch. But take the habit of ventilation hydroponics. In recent years, Okada considered the problem of easily causing rotting roots and poor growth in the later stage of aeration. Based on the previous experience of hydroponics, Okada took the intermittent circulation method of nutrient solution. After six years of practice, this method is proved to be less harmful than the ventilation method