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我国研究磷肥肥效已经四十多年了。解放以前的研究认为,关中塿土(被称为栗钙土、浅栗钙土)施用磷肥效果不高,其原因是土壤磷素储量丰富,而磷素又被土壤所固定了。解放以后,五十年代的试验就出现了施用磷肥获得显著效果的事例。但为什么有时施用磷肥效果显著,有时效果又不好呢?规律何在?我们的研究走过曲折的道路,逐步认识到磷肥肥效不是由单一因素所决定的,而是由土壤、作物、肥料等各方面的因素决定的。这个看来专业性很强的课题,必须在综合的前提下进行研究。必须深入农村,与贫下中农相结合,从农民的生产实践中吸收丰富的营养,把理论与实际,实验室、试
Phosphate fertilizer efficiency in China has been more than 40 years. The liberation of the previous study that Guanzhong clay soil (known as the chestnut soil, chestnut soil) application of phosphate fertilizer is not high, the reason is rich in soil phosphorus reserves, and phosphorus has been fixed by the soil. After the liberation, the experiment in the 1950s showed the remarkable effect of using phosphate fertilizer. However, why is there sometimes significant effect of applying phosphate fertilizer, and sometimes the effect is not good? The law? Our research through the tortuous path, and gradually realized that fertilizer efficiency is not determined by a single factor, but by the soil, crops, fertilizers, etc. Determined by the factors. This seems a highly professional subject, must be studied under the premise of a comprehensive. We must go deep into the countryside, integrate it with the poor middle peasants, and absorb abundant nutrients from peasants’ production practices. Put the theory and practice, the laboratory, the experiment