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| The effects of stack height and sawdust covering depth on ammonia and greenhouse gas emissions from swine manure and global warming potential |
| Received:June 02, 2018 |
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| KeyWord:swine manure;stack heights;sawdust covering depths;ammonia and greenhouse gas emissions |
| Author Name | Affiliation | | ZHU Hai-sheng | College of Animal Science, Southwest University, Chongqing 402460, China | | DONG Hong-min | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LUAN Dong-mei | College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China | | PU De-lun | College of Animal Science, Southwest University, Chongqing 402460, China | | YUAN Feng | College of Animal Science, Southwest University, Chongqing 402460, China |
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| Abstract: |
| To study the effects of stack height and sawdust covering depth on ammonia and greenhouse gas (GHG) emissions from swine manure, and the global warming potential, two stack heights (20 cm and 40 cm) of swine manure and three covering depths of sawdust (0, 10 cm, and 20 cm) were selected to form six treatments. Each treatment was carried out in triplicate. Continuous measurements of ammonia and GHG emissions were carried out using a dynamic system. The experiment lasted 42 days. The results showed that a higher manure stack (40 cm) significantly reduced NH3, N2O, and CO2 emissions, in terms of emissions per kilogram initial manure. However, CH4 emissions showed a completely different trend from that of the NH3, N2O, and CO2 emissions. Sawdust covering reduced the cumulative NH3 and CO2 emissions from swine manure during storage, in terms of emissions per kilogram initial manure, but simultaneously increased the cumulative CH4 emissions. Sawdust covering had different effects on the N2O emissions from swine manure at different stack heights. The covering increased the cumulative N2O emission for the 20 cm stack height of swine manure, but reduced it for the 40 cm stack height. The cumulative GHG emissions from swine manure were 36.62~62.83 g·kg-1 of initial manure weight (based on CO2). Sawdust covering reduced the total GHG emission by 11.59%~23.61%, but there was no significant difference between covered and uncovered samples. Compared with that for the 20 cm stack height of swine manure, the total GHG emission reduction was 36.26%~41.48% for the 40 cm stack height. A higher stack produced the least GHG emissions from swine manure during storage. |
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