|
| Precision application of biogas slurry and its environmental effects in paddy fields |
| Received:December 16, 2016 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biogas slurry;rice;nitrogen use efficiency;ammonia volatilization |
| Author Name | Affiliation | E-mail | | YANG Run | Institute of Resources, Ecosystem and Environment for Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | SUN Qin-ping | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | sunqp@126.com | | ZHAO Hai-yan | College of Resources and Environmental Sciences Nanjing Agricultural University, Nanjing 210095, China | | | ZOU Guo-yuan | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LIU Ben-sheng | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LI Lian-qing | Institute of Resources, Ecosystem and Environment for Agriculture, Nanjing Agricultural University, Nanjing 210095, China | lqli@niau.edu.cn |
|
| Hits: 2548 |
| Download times: 2685 |
| Abstract: |
| A field experiment was conducted to study the effects of biogas slurry application on rice yield, nitrogen(N) use efficiency, surface water mineral nitrogen(Nmin) dynamics, soil Nmin, and ammonia volatilization. The results showed that rice yield had a positive linear relationship with the applied biogas slurry sourced N rate when it was less than 213.9 kg·hm-2, and rice yield could be increased by 9.05 kg per 1 kg biogas slurry sourced N applied. However, rice yield was not increased further when the biogas slurry sourced N input was higher than 213.9 kg·hm-2. Given this, it was indicated that 213.9 kg·hm-2 may be the reasonable application rate for this paddy field. The soil mineral N residue increased linearly with the increase of N application rate after harvest. After the slurry application, the NH4+-N concentration in the surface water was reduced rapidly, and then gradually become stable, whereas slurry application had no significant effect on NO3--N concentration in the surface water. Ammonia volatilization mainly happened in the first week after fertilizer application, and the N loss caused by ammonia volatilization accounted for 14.52%~17.64% of the biogas slurry sourced N application rate. Compared to chemical fertilizer application, the rice grain yield, nitrogen use efficiency, and soil Nmin were similar under biogas slurry application with the same amount of N, whereas the ammonia volatilization intensity(kg NH3 per kg rice yield) was significantly reduced by 22.6%. According to the results of this study, the rational use of biogas slurry in paddy fields could have good economic and environmental benefits. |
|
|
|
