施用磷肥的效果决定于作物对磷素的需要和土壤的供磷能力,而土壤的供磷能力是与土壤中磷素的状况直接相关的,不同类型的土壤,其磷素状况不同,供磷水平亦不一样。土壤磷素状况及其对植物的有效性,前人已进行了广泛的研究。在早期的研究中,常用土壤全磷量来表示土壤磷素的丰缺程度。1894年Byer提出了用1%柠檬酸来提取土壤速效磷作为衡量土壤供 The effect of applying phosphate fertilizer depends on the crop’s need for phosphorus and soil phosphorus supply capacity, while the soil phosphorus supply capacity is directly related to the status of phosphorus in the soil, different types of soil, the phosphorus status is different, for phosphorus The level is not the same. Soil phosphorus status and its effectiveness on plants, have been extensively studied. In earlier studies, the amount of soil total phosphorus was used to indicate abundance and deficiency of soil phosphorus. In 1894 Byer proposed using 1% citric acid to extract soil available phosphorus as a measure of soil supply