应用Mehlich3浸提剂提取风沙土中速效磷、速效钾的条件实验

摘要/Abstract

摘要： 应用正交实验法研究了Mehlich3试剂测定风沙土中速效磷、速效钾的适宜条件,并以Olson法(测磷)、NH₄OAC法(测钾)为标准对所确定的条件进行了检验,结果表明:浸提剂:沙样为10:1,浸提温度为常温,震荡时间为5 min适宜于待测容液的提取。用钼锑法测定待测溶液中的磷,适宜的显色酸度为0.55 mol/L 1/2H₂SO₄条件下测定结果与参比法测定结果显著相关;且精密度高、提取量多,是一种适宜风沙土测定的通用浸提剂。

关键词: Mehlich3试剂, 风沙土, 条件实验

Abstract: This paper studied the appropriate conditions of determining available P and K with mehlich3 reagent by orthogonal design experiment method in eolian sand soil and tested determinative condition by Olsen method(determine P) and NH₄OAC method(determine K) respectively.Results showed that appropriate condition of extracting solution used for measuring available P and K was that extractent:soil ratio was 10:1,working temperature 25℃ and shake time 5 min,It was 0.55 mol/L 1/2 H₂SO₄ that reached an appropriate discharge-color acidity of determining P by Molybdophosphoric Blue Color method in solution.Under these conditions the determined results with Mehlich 3 method were not only remarkably related to contrast method,but also had a higher precision,more extract and more extensive applicable range.Therefore,Mehlich3 extractent is an universal extractent of determining available P and K of eolian sand soil.

Key words: Mehlich3 reagent, Eolian sand soil, Determination Available P

张志谦. 应用Mehlich3浸提剂提取风沙土中速效磷、速效钾的条件实验[J]. 中国沙漠, 1994, 14(2): 78-83.

Zhang Zhiqian. STUDY ON DETERMINING CONDITIONS OF AVAILABLE P AND K WITH MEHLICH3 REAGENT IN EOLIAN SAND SOIL[J]. JOURNAL OF DESERT RESEARCH, 1994, 14(2): 78-83.

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应用Mehlich3浸提剂提取风沙土中速效磷、速效钾的条件实验

STUDY ON DETERMINING CONDITIONS OF AVAILABLE P AND K WITH MEHLICH3 REAGENT IN EOLIAN SAND SOIL

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