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| Effects of biogas slurry application on nitrogen loss soil in black soil area during the autumn fallow period |
| Received:September 06, 2021 |
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| KeyWord:biogas slurry;autumn fallow period;ammonia volatilization;nitrogen leaching;black soil |
| Author Name | Affiliation | E-mail | | LIU Cong | School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | | ZHENG Yaoqi | School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | | LIU Shuang | School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | | LIU Qingping | School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | | YAN Lilong | School of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | yanll98@163.com |
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| Abstract: |
| To explore the feasibility of applying biogas slurry during the non-planting period, different amounts of biogas slurry with different amount of nitrogen replacement were applied via spraying with deep turning and injection to the black soil of northeast China in October 2018 and October 2019. In addition, the effect of applying biogas slurry on the organic matter content of maize soil in the black soil area was investigated after crop harvesting(the autumn fallow period). The characteristics of ammonium nitrogen volatilization, ammonium nitrogen leaching, and nitrate nitrogen leaching in maize soil in black soil area were also determined. The results showed that the application of biogas slurry could increase the organic matter content of soil, and the improvement of soil organic matter by biogas slurry injection was higher than that by spraying. Applying biogas slurry by spraying with the deep turning method under low temperatures during the autumn fallow period could reduce ammonia volatilization from soil. Biogas slurry could be applied by spraying when the amount of nitrogen replacement was <135 kg·hm-2·d-1 in the autumn fallow period, and there was no leaching risk of ammonium nitrogen and nitrate nitrogen. However, a potential leaching risk of ammonium nitrogen existed even when the amount of nitrogen replacement was 90 kg·hm-2·d-1 using the injection method. The experimental results of both years indicate the feasibility of applying biogas slurry with a reasonable amount of nitrogen replacement and a suitable application mode during the autumn fallow period. |
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