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| Influence of Irrigation with Anaerobic Effluent from Swine Farms on Leafy Lettuce Growth and Soil Nutrients in Fluvo-aquic Soil |
| Received:March 02, 2015 |
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| KeyWord:pig farm;anaerobic effluent;irrigation;leaching;nitrate;organic carbon |
| Author Name | Affiliation | E-mail | | SHI Ya-nan | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Land and Environment, Shenyang Agriculture University, Shenyang 110866, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XUE Chang-liang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHAO Jun-yi | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | QIAO Bin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | wangfeng_530@163.com |
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| Abstract: |
| The pollution from wastewater of the livestock and poultry breeding farms has become a severe environmental issue. However, such wastewater may be applied to agricultural land due to its nitrogen, phosphorus and other nutrients. Here, an experiment was carried out to investigate the growth of leafy lettuce and the dynamic of soil nutrients in fluvo-aquic soil irrigated with anaerobic effluent from swine farms. The effluent was applied at various dilutions(no dilution, 1:1, 1:2, 1:3, 1:5). Results showed that irrigation with no dilution caused the greatest leaching amounts of soil carbon, nitrogen and phosphorus. They were respectively 637.2 mg, 242.1 mg, and 12.2 mg per plot for the first season, and 149.6 mg, 61.44 mg, and 1.13 mg per plot for the second season, which were 1.01~3.54 times those of chemical fertilizer(CK). The leached inorganic carbon was 85%~90% of the total leached carbon. The main form of leached nitrogen was nitrate, accounting for 84%~91% of total leached nitrogen. However, irrigation with diluted anaerobic effluent could effectively reduce soil carbon leaching, showing a positive effect on soil carbon fixation. Compared with the CK treatment, application of 1:2 diluted wastewater increased the survival rate and the yield of leafy lettuce by 17.67% and 18%, but reduced leaching amount of total carbon, total nitrogen and total phosphorus by 49%~56%, 5%~44% and 20%~34%, respectively. In considering leafy lettuce yield, soil nutrient leaching losses and the prevention and control of non-point source pollution, it is suggested that the optimal dilution ratio of anaerobic water would be 1:2 for leafy lettuce production. |
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