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| Effects of biogas slurry substituting fertilizer on greenhouse gas emission and greenhouse effect of wheat-corn crop rotation |
| Received:May 20, 2018 |
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| KeyWord:biogas slurry;wheat-maize;greenhouse gas;GWP;GHGI |
| Author Name | Affiliation | E-mail | | YIN Gao-fei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Xiao-fei | Henan Academy of Agriculture Science, Zhengzhou 450002, China | | | SHEN Shi-zhou | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DU Hui-ying | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | BA Shi-di | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | kqzhang68@126.com |
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| Abstract: |
| Greenhouse gas emissions under biogas slurry irrigation from the wheat-maize rotations were measured in situ using the method of static chambers and gas chromatographic techniques, and the greenhouse effects were assessed by using Global Warming Potential (GWP) and Greenhouse Gas Emissions Intensity (GHGI). The results showed that during winter wheat-summer maize rotation period, the GWP of T3 (3 times in wheat season and 1 time in maize season of 2:1 biogas slurry irrigation) and T4 (4 times in wheat season and 1 time in maize season of 2:1 biogas slurry irrigation) for the year 2017 were not significantly different from those for the year 2016 unlike the GWP with conventional fertilization (CF). The GWP of T3, T4 and CF in 2016 were 2 990.82±285.00, 3 235.48±307.05, 3 047.35±315.11, respectively; while, the GWP of T3, T4 and CF in 2017 were 2 865.61±296.44, 3 069.10±318.44, 2 741.70±284.37, respectively. But the GWP was significantly reduced by T1 (1 time in wheat season and 1 time in maize season of 2:1 biogas slurry irrigation) and T2 (2 times in wheat season and 1 time in maize season of 2:1 biogas slurry irrigation) treatments compared with the GWP by CF treatment.The GWP of T1 and T2 in 2016 and 2017 were 2 578.57±279.39 and 2 586.13±263.01; 2 702.59±300.75 and 2 733.19±260.81 respectively. Compared with CF, T1 and T2 treatment reduced GWP by 15.38% and 11.31% in 2016 and by 5.67% and 0.31% in 2017. In terms of yield analysis, T2, T3, T4 and CF treatment did not show significant difference in two consecutive years, the yield of T4 treatment was 4.12% higher than that of CF treatment in 2016.The GHGI of T3, T4 and CF treatments were not significantly different for two consecutive years. Compared with CF treatment, the GHGI by T1 and T2 treatments significantly decreased by 0.56% in 2016, while T2 and CF treatments had shown no significant difference in 2017. Comprehensively, with the consideration of GWP and crop yield factors, the T2 treatment (2 times in wheat season and 1 time in maize season of 2:1 biogas slurry irrigation, and 315 kg·hm-2) might be the optimal choice. Therefore, T2 treatment is a reasonable irrigation mode instead of the application of chemical fertilizer. |
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