旱地土壤有效钾测定方法的研究
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STUDY ON DETERMINATION METHODS.FOR AVAILABLE POTASSIUM IN UPLAND FIELD
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    摘要:

    本文用盆栽耗竭试验为参比,研究了7种化学浸据测钾方法对旱地土壤的适用性。试验结果表明:1.作物吸收的有效钾中非交换性钾占有很大比重,表明它是作物钾素的主要给源。2.供试7种化学浸提方法的测定结果与盆栽试验中的四项参比标准的统计结果表明,2mol/L冷HNO3法和阳离子树脂袋法与参比标准的相关性最好,均达极显著水平。3.2mol/L冷HNO3法和阳离子树脂袋法所提取的非交换性钾与作物吸收非交换性钾总量也都是极最著相关,表明两法提取的非交换性钾均属能被作物吸收的易有效的非交换性钾。4.本文推荐2mol/L冷HNO3法和阳离子树脂袋作为旱地土壤有效钾的测定方法,但2mol/L冷HNO3法在操作上更为简便。

    Abstract:

    The suitability of seven methods for chemical extraction of available potassium in the upland field was studied by using exhaustion pot experiment as the reference standard. The results were summarized as follows: 1.Available K absorbed by plants mainly Came from the nonexchangeable K, which was the main source of K takd up by plants. 2. Der termination results of correlation coefficients between four reference standards of pot experiment and results of seven chemical methods showde that correlation between cold 2 mol/L HNO3 method and Cation-exchange resion bag method was highly significant (0.953 and 0.903 average). 3. The correlation between the nonexchangeable K extracted by cold 2 mol/L HNO3 method and Cation-exchange resin bag method and the amount of nonexchangeable K absorbed by plant was highly singificant. 4. Both of the cold 2 mol/L HNO3 method and Cation-exchange resin bag method could be recommended as the methods for the determination of available potassium in upland field, but the Cold 2 mol/L HNO3 method was more simple and convenient than the Cation-exchange resin bag method.

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戴自强,李明德.旱地土壤有效钾测定方法的研究[J].土壤学报,1997,34(3):336-343. DOI:10.11766/trxb199508200314 Dai Ziqiang, Li Mingde. STUDY ON DETERMINATION METHODS. FOR AVAILABLE POTASSIUM IN UPLAND FIELD[J]. Acta Pedologica Sinica,1997,34(3):336-343.

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  • 收稿日期:1995-08-20
  • 最后修改日期:1996-06-05
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  • 在线发布日期: 2013-02-25
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