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| The factors affecting Mehlich3 method for determining soil available nutrient content |
| Received:July 14, 2022 Revised:August 15, 2022 |
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| DOI：doi:10.3969/j.issn.2095-1035.2023.05.011 |
| KeyWord:Mehlich 3 method; Orthogonal test; Soil available nutrients; The extraction conditions |
| Author | Institution |
| YANG Jianhao |
河北农业大学资源与环境科学学院 |
| ZHANG Yuwei |
中国农业科学院农业资源与农业区划研究所 |
| FU Guohai |
全国农业技术推广服务中心 |
| ZHONG Yonghong |
全国农业技术推广服务中心 |
| DU Sen |
全国农业技术推广服务中心 |
| GAO Xiangzhao |
全国农业技术推广服务中心 |
| ZHANG Lijuan |
河北农业大学资源与环境科学学院 |
| WANG Hong |
中国农业科学院农业资源与农业区划研究所 |
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| Abstract: |
| Mehlich 3 method has been used to extract and determine various available nutrients in soil. However there are few studies on the influencing factors of this method. We selected two soil samples such as purple soil from chongqing and aquatic soil from Hebei. Orthogonal test with L9(34)was designed Four factors including the volume of extract solution (A), shaking time (B),shaking temperature (C) and pH of extraction solution (D) were set. The element concentrations of the extract were determined by inductively coupled plasma emission spectrometer. The results showed the amount of soil available nutrient increased with increasing pH of extract solution. oscillation temperature had less influence on the content of soil nutrients. It is suggested that the optimal conditions for extracting soil nutrient by Mehlich 3 method was A1B1C1D1. A portion of 5.00 g of the air-dried soil samples were added with 25.0 mL of M3 extraction solution with pH of 2.5, which was shaken at 25℃ for 5 min. The relative standard deviation of elements is less than 5% with good precision. |
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