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| Effect of Soil pH on CH4 and N2O Emissions After Topdressing Digested Pig Slurry |
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| KeyWord:digested pig slurry; CH4 and N2O emissions; soil pH |
| Author Name | Affiliation | | JIN Hong-mei | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center | | CHANG Zhi-zhou | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center |
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| Abstract: |
| Applying the digested slurries to land is the most attractive and effective alternative in terms of economic and nutrient recycling issues. In order to better management of the nutrient of digested slurries, it is important to study the correspondences of greenhouse gases（CH4 and N2O emissions） to soil pH. In this study, soils with pH of 5.5（S5.5）, 6.5（S6.5） and 8.2（S8.2） were used to the pot experiment to study the effect of digested pig slurry（DPS） application on emissions of CH4 and N2O. Meanwhile, the application of chemical fertilizer（CF）and water without fertilizer（CT） were used to compare with DPS. The vegetable planting in the pot was crown daisy（Chrysanthemum carinatum Schousb.）. Results showed that emissions of CH4 and N2O increased after application of DPS. In S6.5 and S8.2, the increases of CH4 and N2O in DPS were significant compared with CF treatments. CH4 was negative release in lower pH soils, such as S5.5 and S6.5, after the early application of DPS. After that the emission became positive. But CH4 in S8.2 was always positive release. N2O in S5.5 was significantly higher in DPS treatments than that in CF and CT treatments at the third topdressing; while N2O in S6.5 and S8.2 were significantly higher than those in CF and CT treatments during the whole the growing period of crown daisy. The trend of average emission of CH4 in different soils was S8.2>S6.5>S5.5 after application of DPS, while that of N2O was S6.5>S8.2>S5.5. There was environmental risk after application of digested slurries in alkali soils. |
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