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| Nitrification inhibitors prevent nitrogen leaching in soil irrigated by biogas slurry |
| Received:December 11, 2018 |
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| KeyWord:biogas slurry;DCD;nitrapyrin;nitrogen;leaching loss |
| Author Name | Affiliation | E-mail | | YANG Han-bo | College of Grass and Environmental Sciences, Xinjiang Agricultural University, Urumqi 830052, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LAI Rui-te | 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 | | | SHEN Feng-ju | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Jia-jia | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | GAO Wen-xuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LUO Yan-li | College of Grass and Environmental Sciences, Xinjiang Agricultural University, Urumqi 830052, China | luoyanlimail@sina.com | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | wangfeng_530@163.com |
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| Abstract: |
| The aim of this study is to investigate the control efficiency of soil nitrogen leaching by nitrification inhibitors under biogas slurry irrigation conditions. Laboratory simulation tests were performed, including urea solution treatment, biogas slurry treatment, and nitrification inhibitors treatments. The concentrations of nitrification inhibitors were 5%, 10%, and 15% of DCD and 0.25%, 0.5%, and 1% of nitrapyrin. Ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), total nitrogen (TN), and dissolved organic carbon content (DOC) in the soil leaching solution were monitored for five continuous irrigation cycles. Compared with urea solution group, the application of biogas slurry could reduce the leaching loss of nitrogen and DOC. The concentrations of TN, NH4+-N, NO3--N, and DOC in leachate in DCD group were reduced by 27.19%, 35.69%, 45.89%, 53.69%, and in nitrapyrin group by 24.86%, 30.87%, 21.10%, 64%, respectively, with 5% level of significance for various treatments. Considering the cost and control effects, application of DCD at 5% with biogas slurry was recommended as an optimized control mode for preventing nutrient leaching. In addition, a significant correlation was found between nitrate concentration in soil leaching solution and redox potential under continuous saturated biogas irrigation (R2=0.602 8*, n=34). The application of nitrification inhibitor in biogas slurry is an effective measure to restrict nutrient leaching, improve nutrient utilization efficiency, and control nitrate nitrogen leaching pollution. However, the relationship among the control efficiency, inhibition time, and application methods requires further investigation. |
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