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| Effects of different soil additives on rice yield and utilization of nitrogen and phosphorus in the Tai Lake region |
| Received:December 29, 2016 |
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| KeyWord:paddy;soil additive;yield;nitrogen use efficiency;nutrient concentration in surface water |
| Author Name | Affiliation | E-mail | | LIU Ya-wen | Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downstream of Yangtze Plain, Ministry of Agriculture, Nanjing 210014, China
Nanjing Forestry University, Nanjing 210037, China | | | MA Zi-hou | Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downstream of Yangtze Plain, Ministry of Agriculture, Nanjing 210014, China | | | PAN Fu-yan | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YANG Lin-zhang | Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downstream of Yangtze Plain, Ministry of Agriculture, Nanjing 210014, China | | | XUE Li-hong | Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downstream of Yangtze Plain, Ministry of Agriculture, Nanjing 210014, China | njxuelihong@gmail.com |
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| Abstract: |
| Agricultural nonpoint source pollution has been one of the main causes of water eutrophication in the Tai Lake region.Biochar,microbial agents,and nitrification inhibitors,individually or in combination,were added to the paddy soil in this study in order to evaluate the effect of different soil additives on paddy nonpoint pollution control.The effects on rice growth and yield,N and P uptake by rice,N and P concentration in surface water,and soil nutrient status after harvest were investigated.The results showed that all the soil additives ensured rice growth and promoted yield,with biochar,biochar combined with microbial agents,or nitrification inhibitors significantly increas ing rice yield by 57.5%,66.1%,and 45.4%,respectively,compared with the treatment without soil additive.The biochar combined with microbial agents treatment significantly increased the plant N uptake and N recovery efficiency,but all the treatments with additives significantly improved the agronomy efficiency and physiological efficiency of N,with the biochar treatment and the biochar and microbial agent combination treatment performing the best.Compared to the treatment without additives,the treatment with microbial agents increased the total N concentration in surface water,whereas other treatments,especially the treatment combining biochar with other additives,significantly decreased the total N concentration in surface water for the basal fertilizer stage.At the panicle fertilizer stage,all treatments with additives,except the combination treatment of biochar and microbial agents,obviously increased the N concentration of surface water.The total P concentration of surface water increased slightly at the basal and panicle fertilizer stages,but the difference was not significant when compared with the treatment without additives.No significant difference was observed in the soil fertility between the treatments with and without soil additives.For comprehensive consideration of yield,nitrogen use efficiency,and nutrient loss risk of surface water,the treatment combining microbial agents with biochar was best for maintaining the high paddy yield and reducing nutrient loss risk during the early fertilization period of the paddy.Therefore,this combination treatment is promising for controlling nonpoint source pollution in the Tai Lake region. |
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