新疆土壤普遍缺磷、少氮,钾丰富,增施磷素肥料已成为新疆各地提高农作物产量的重要措施。但是,如何给农作物合理施用磷素肥料呢?这就需要准确测定农田土壤的磷素,特别是有效磷的含量,然后根据农作物的需磷量计算出所需补充的磷量。但是,本人近几年在检查验收全疆各地土壤普查化验成果时,发现各地应用的比色法测磷,测得结果欠准确。现提出提高比色法测磷准确性的几点分析要求,供同行讨论、参考。 Xinjiang generally lack phosphorus, less nitrogen and potassium, increased phosphorus fertilizer has become an important measure to increase crop yields throughout Xinjiang. However, how to apply phosphorus fertilizer rationally to crops? This requires accurate determination of phosphorus in farmland soil, especially available phosphorus, and then calculate the required amount of phosphorus supplement according to the demand of crops. However, in recent years, I checked and accepted the results of soil census tests in all parts of Xinjiang. I found that the colorimetric method used in various places measured phosphorus and the measured results were not accurate. Are proposed to improve the accuracy of colorimetric phosphorus analysis of several analytical requirements for peer discussion, reference.