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| Risk of nitrogen loss under the combined application of biogas slurry and organic fertilizer |
| Received:December 21, 2018 |
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| KeyWord:biogas slurry;organic fertilizer;nitrogen loss;paddy field;ammonia volatilization;runoff loss |
| Author Name | Affiliation | E-mail | | ZHOU Wei | Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs/Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SUN Guo-feng | Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs/Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | WANG Xin | Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs/Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | TONG Hong-yu | Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs/Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SHENG Jing | Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs/Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | nkysj@hotmail.com |
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| Abstract: |
| The purpose of this study is to explore a model for the combined application of biogas slurry and organic fertilizer instead of chemical nitrogen fertilizer to reduce the risk of nitrogen loss in a paddy field while maintaining a stable yield. A pot experiment was conducted to investigate the characteristics of ammonia volatilization, nitrogen content in surface water, and nitrogen loss in runoff after fertilization during rice growth. The soil from a paddy field in Taihu Lake was used in the experiment. There were six treatments, including a blank control, conventional chemical fertilizer, 100% biogas slurry, 75% biogas slurry + 25% pig manure organic fertilizer, 50% biogas slurry + 50% pig manure organic fertilizer, and 100% pig manure organic fertilizer. The results showed that under the same nitrogen application rate, rice yield in the conventional chemical fertilizer treatment reached 12 752.70 kg·hm-2, and the total amount of ammonia volatilization and nitrogen loss in runoff was 76.99 kg·hm-2 and 39.11 kg·hm-2, respectively. Compared with the conventional chemical fertilizer treatment, the ammonia volatilization was significantly higher in both 100% biogas slurry treatment and 75% biogas slurry + 25% pig manure organic fertilizer treatments, with 120.66 kg·hm-2 and 88.01 kg·hm-2, respectively. The total amount of ammonia volatilization (58.03 kg·hm-2) and runoff nitrogen loss (22.00 kg·hm-2) in the 50% biogas slurry + 50% pig manure organic fertilizer treatment was significantly lower than that in the conventional chemical fertilizer treatment; however, the rice yield did not differ significantly. The amount of ammonia volatilization and runoff nitrogen loss in 100% pig manure organic fertilizer treatment was the lowest among all treatments; however, the rice yield was lower than that of the 50% biogas slurry + 50% pig manure organic fertilizer treatment. Therefore, 50% biogas slurry + 50% pig manure organic fertilizer is a more appropriate fertilization model, which can reduce the risk of ammonia volatilization and runoff nitrogen loss while maintaining a certain yield. |
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