作　　者： ; ; ; ; ;

机构地区： 中国农业科学院农业资源与农业区划研究所

出　　处： 《中国土壤与肥料》 2011年第3期87-91,共5页

摘　　要： 提高常规方法土壤测试的效率是我国测土配方施肥亟待解决的技术问题。通过30个有代表性的土样研究了与现代化测试技术手段相应的土壤有效磷(Olsen-P)的分析过程的改进和提高,结果显示:700 nm波长比色测定土壤有效磷比882 nm波长测定有显著正偏差,土壤有效磷的比色测定应该用882 nm波长以消除土壤可溶有机质影响;改进的钼锑抗显色剂10 min可稳定显色,大大缩短了比色测定需要等待的时间,且测定结果与原有测定过程测定结果一致。同时改进的显色剂稳定时间长,24 h的测定结果和10 min测定结果没有差异。土壤有效磷测定显色过程采用稀释加液器和比色测定中采用泵吸式进样器,可以大大提高土壤测试效率。 Improve efficiency of Chinese traditional soil testing method is eager to be solved in soil testing and fertilizer recommendation action.It was studied that technical advances and adjustment of the method applying in the determination of available phosphorus（Olsen-P）with modern testing technology.Research using 30 soil samples indicated that amount of high bias associated with the 700 nm relative to the 882 nm wavelength was highly soil dependent.The 882 nm wavelength was superior and did not have a soil soluble organic interference that was noted for the 700 nm wavelength.Thus it was suggested that using the 882 nm wavelength for all bicarbonate soil extracts to avoid a high bias.The modified ascorbic acid-molybdenum blue method improved the soil testing efficiency.The absorbance could be read after 10 minutes of adding the modified phosphor-molybdenum blue reagent and the readings could be stable during 24 h.The results showed there were no differences of the revised method with the old procedure and reagent.Soil testing efficiency was highly improved by using the specialized dilute-dispenser for adding soil extract,the reagent and deionized water and measuring the absorbance by the pumping-injected spectrophotometer.

关 键 词： 土壤有效磷 土壤测试 测试效率

领　　域： [农业科学] [农业科学]