土壤有效磷系指土壤中可为植物吸收利用的磷素。它是植物磷素营养的主要来源,可以直接影响到植物的生长和发育,因而是土壤肥力的重要标志之一。在指导农业生产、总结生产经验和进行农业化学研究工作时,常需进行土壤有效磷含量的测定。其测定方法一般是利用一种浸提液,将土壤中某些形态的磷素浸出,然后再用比色法测定浸出液 Soil available phosphorus refers to the soil can be used for plant absorption and utilization of phosphorus. It is the main source of plant phosphorus nutrition, which can directly affect the growth and development of plants, and is therefore one of the important symbols of soil fertility. In guiding agricultural production, summing up production experience and agricultural chemical research, often need to determine the content of soil available phosphorus. The determination of the method is generally the use of a leaching solution, leaching of some forms of phosphorus in the soil, and then measured by colorimetric leachate