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Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (18): 73-79.doi: 10.11924/j.issn.1000-6850.casb20191100871

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Measuring Methods of Exchangeable Calcium and Magnesium in Acid and Neutral Soil of Rubber Plantation

Xu Muguo, Ding Huaping, Liu Zhongmei, Chen Guiliang, Chen Yongchuan, Li Xiaoqing()   

  1. Yunnan Institute of Tropical Crops, Jinghong Yunnan 666100
  • Received:2019-11-25 Revised:2020-03-10 Online:2020-06-25 Published:2020-07-10
  • Contact: Li Xiaoqing E-mail:lxq4118@163.com

Abstract:

To obtain a simple and easy to operate method with high accuracy to determine exchangeable calcium and magnesium in acid and neutral soil of rubber plantation, through the response surface optimization test, a mathematical model was established between the sample size, the liquid volume, the extraction method and the results of exchangeable calcium. The study showed that: under the condition of 25 ℃, 1 mol/L ammonium acetate was taken as the soil extract, the sample volume was 2 g, the extracted liquid was 175 mL, and the oscillation was 36 min, which was the best extraction condition for acidic and neutral soil in rubber plantation. The results obtained under the above condition were consistent with those of the standard method, and the relative errors ranged from 1.25 to 3.04, which were all within a reasonable range. The optimized method was tested and verified with standard samples, and the results were consistent with the recommended values. The improved method has the advantages of low cost, simple operation, accurate measurement results and good stability, which can be applied to the determination of exchangeable calcium and magnesium in acid and neutral soil of rubber plantation.

Key words: Rubber plantation soil, response surface analysis, exchangeable calcium and magnesium

CLC Number: