本文对吉林省东、中、西三个地区有代表性的旱田土壤,应用五种化学测定土壤速效磷的方法。研究了玉米吸磷量与磷素形态的相互关系。试验结果表明,在耕层0—20cm无碳酸盐反应的旱田土壤,Bray I法(1∶50)与土壤供给玉米磷素的主要磷源Al—P、Fe—P呈极显著相关,与玉米吸磷量也呈极显著相关。而且该法简便易行,不需要恒温设备,灵敏度高,因此认为该法是测定我省主要旱田土壤速效磷较为理想的方法。 In this paper, five representative soil samples were obtained from three areas of east, middle and west of Jilin Province, and five methods were used to determine available phosphorus in soil. The relationship between phosphorus uptake and phosphorus form in maize was studied. The results showed that there was a significant correlation between the Bray I method (1:50) and Al-P and Fe-P, the major phosphorus sources of maize phosphorus in the topsoil, P uptake by maize was also significantly correlated. And the method is simple and easy, does not require constant temperature equipment, high sensitivity, so that the method is to determine the main dry availability of soil available phosphorus is the ideal method.