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| Effect of magnesium oxide and alum addition on soil labile phosphorus in a high P content vegetable field |
| Received:September 12, 2017 |
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| KeyWord:high P soil;magnesium oxide;alum;phosphorus fraction;phosphorus fixation |
| Author Name | Affiliation | E-mail | | ZHU Jian | Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | FAN Bing-qian | Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | GAO Bin-bin | Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | CHEN Qing | Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | qchen@cau.edu.cn |
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| Abstract: |
| In order to study the effect of different kinds of phosphorus(P) stabilization materials on the fixation of soil P, an incubation experiment was conducted to investigate the abilities of magnesium oxide(MgO), alum, and their mixtures at different ratios to reduce 0.01 mol·L-1 CaCl2 extracted P(CaCl2-P), 0.5 mol·L-1 NaHCO3 extracted P(Olsen-P), and the soil P fraction. The results indicated that the addition of MgO and alum could significantly decrease the soil CaCl2-P level compared with the control treatment, and this occurred at both 0.5% and 2.0% soil dry weight. After 45 d incubation, MgO decreased soil CaCl2-P by 87.8%(0.5%) and 98%(2.0%), whereas alum addition reduced soil CaCl2-P by 44.4%(0.5%) and 88.8%(2.0%). The MgO, alum, or a mixture addition at 2.0% soil dry weight significantly decreased soil Olsen-P level. The decline of soil CaCl2-P and Olsen-P influenced by the mixture of MgO and alum was less effective than that of MgO and alum, respectively. The results after measuring the soil P fraction by Hedley fractionation indicated that MgO or alum addition significantly decreased the soil labile P level, and alum significantly increased the NaOH extracted P content compared to the control treatment. In general, MgO significantly decreased the CaCl2-P levels, but alum also significantly decreased the Olsen-P due to the different P fixation mechanism. |
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