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| Dynamic characteristics of soil phosphorus release in a flooded greenhouse soil after calcium cyanamide and or straw addition |
| Received:September 02, 2022 |
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| KeyWord:calcium cyanamide;straw;flooded soil;phosphorus release;greenhouse vegetable field |
| Author Name | Affiliation | E-mail | | ZHOU Yan | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | | | JIN Jiawen | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China
Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China | | | WU Gang | Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China | | | CHEN Shuo | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | | | DING Shuai | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | | | CHEN Qing | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | | | CUI Jianyu | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | | | ZHANG Shuai | Beijing Key Laboratory of Agricultural Soil Pollution Prevention, Control and Remediation, School of Resources and Environment, China Agricultural University, Beijing 100193, China | shuai.zhang@cau.edu.cn |
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| Abstract: |
| Applying calcium cyanamide and straw to flooded greenhouse soils during the summer can effectively inhibit soil diseases and amend the soil. However, the impact of calcium cyanamide and straw additions on phosphorus(P) mobilization and the associated risk of P loss in flooded greenhouse soil is still unclear. Therefore, we collected soil and soil solution samples five times(days 3, 7, 15, 31, and 63) to determine the impact of calcium cyanamide(0.5 g·kg-1) or straw(10 g·kg-1) additions on P release and its dynamic features in flooded greenhouse soil. Results showed that the concentration of P in the soil solution of the control and calcium cyanamide addition treatments increased from day 3 to day 15 and then decreased from day 15 to day 63. Unlike with the calcium cyanamide treatment, the concentration of P in the soil solution of the calcium cyanamide+straw treatment group decreased from day 3 to day 15 and remained stable over time. Compared with the control, the calcium cyanamide addition significantly decreased the concentration of P in the soil solution by 38.7%, 33.4%, and 19.0% on days 3, 7, and 15, while the calcium cyanamide+straw additions decreased the concentration of P in soil solution by 16.6%, 91.5%, and 99.1% on days 3, 7, and 15, respectively. During the incubation period, the concentration of Ca2+ in soil solution after calcium cyanamide addition increased noticeably, helping the precipitation of calcium and phosphate, and thereby lowing the concentration of P. The increased Fe2+ concentration did not increase the P concentration in the soil solution after the calcium cyanamide+straw additions. Instead, the increase of NaOH-P proportion in soil and the increase of Ca2+ and Mg2+ concentration in soil solution support that the acidification effect induced by the decomposition of straw promoted the retention of phosphate by iron/aluminum oxides. In conclusion, applying calcium cyanamide and straw not just amends the soil and prevents disease but also lowers the risk of P loss from flooded greenhouse soils. |
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