Effects of Fertilizers and Mushroom Residues on Soil N2O Emission Under Rice-Wheat Rotation in Chengdu Plain

  •  Xuesong Gao    
  •  Xiaolin Xiaolin Huang    
  •  Liangji Deng    
  •  Shirong Zhang    
  •  Jing Zhou    
  •  Min Zeng    


Nitrous oxide (N2O) is a greenhouse gas, and agricultural landscapes are major sources of atmospheric N2O. In this study, different types and levels of fertilization were applied to rice and wheat plants, including full crop straw, pure synthetic fertilizer and spent agro-residues from mushroom cultivation. N2O flux measurements were performed once a week using gas static chromatography-chamber between 2008 and 2009. In order to find out the effect of MR application on N2O emission, soil samples, environment-monitoring factors including soil moisture and temperature and biomass were also determined. Soil nitrate and ammonia were measured in soil extracts. The results showed that the total N2O emission decreased to 19,066 kg ha-1 in the rice stage and 45,312 kg ha-1 in the wheat stage under the mushroom residue (MR) application. This observation indicated that MR application (22,656.40 kg for rice and 9,533.33 kg for wheat) induced a decrease of N2O emission by 62.52% and 67.55% as compared with fertilizer and straw application, which are 6328.77±740.81b g ha-1, 7310.60±279.73b g ha-1 respectively. Therefore, MR application could be one of the most effective ways to reduce soil N2O emissions.

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