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田间试验表明,有效磷含量低于25ppm的土壤。施用磷肥的当季,对麦子有增产作用;而对于水稻,即使土壤有效磷含量仅有14ppm,也没有增产效果。但是,施用磷肥不论是对水稻还是对麦子不仅都有一年以上的后效,而且在提高土壤有效磷的含量上,水、旱作期间都很显著。试验还表明,施用磷肥对作物吸收磷素的影响较大。本试验结果,对水旱轮作周期中磷肥的施用问题,提供了一定的依据。
Field trials have shown that soils with less than 25 ppm available phosphorus. The season of application of phosphate fertilizer has the effect of increasing the yield of wheat, while for rice, there is no increase of yield even if the soil contains only 14 ppm of available phosphorus. However, application of P fertilizers not only has more than one year’s aftereffect on rice or wheat, but also significantly increases soil available phosphorus in water and dry land. The experiment also showed that the application of phosphate fertilizer on the crop to absorb phosphorus greater impact. The results of this experiment provide a basis for the application of phosphate fertilizer in the period of drought and drought.