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| Effects of dicyandiamide and hydroquinone on greenhouse gas emissions during composting |
| Received:August 24, 2021 |
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| KeyWord:composting;dicyandiamide;hydroquinone;greenhouse gas;ammonia |
| Author Name | Affiliation | E-mail | | YANG Yan | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | YIN Ziming | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | YUAN Jing | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | LUO Yiming | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | LI Guoxue | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn |
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| Abstract: |
| Dicyandiamide and hydroquinone have been widely used to improve crop yield and reduce nitrogen loss in farmland. With the aim of achieving simultaneous emission reduction of greenhouse gases and ammonia during manure composting, this study explored the effects of dicyandiamide with different addition ratios and addition times on greenhouse gas and ammonia emissions based on the addition of hydroquinone during composting. In this study, pig manure and corn straw were used as compost materials, and five composting treatments were carried out for 40 days in a 60 L composting vessel. The control check continued without any additives, the HD treatment condition was supplemented with only 0.03% dry weight hydroquinone, and the other three treatments involved the addition of hydroquinone, 0.1% dicyandiamide on the 19th day, 0.2% dicyandiamide on the 0th day, and 0.1% dicyandiamide on the 0th and the 19th days. The results showed that the addition of 0.1%~0.2% dicyandiamide and 0.03% hydroquinone had no substantial adverse effects on the composting process of pig manure and corn straw. Hydroquinone, as a urease inhibitor, had little effect on ammonia and greenhouse gas emissions, but adding dicyandiamide on the basis of hydroquinone addition reduced NH3 emissions by 8.88%~12.94%, CH4 emissions by 6.79%~13.55%, and N2O emissions by 24.71%~35.83%; the total greenhouse effect could be reduced by 18.61%~19.97%. Considering the economic cost and emission reduction effect, it is suggested that dicyandiamide should be added during the composting cooling period. |
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