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| Effects of the N and P concentrations in domestic wastewater on the growth,N and P uptakes of rice |
| Received:November 22, 2016 |
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| KeyWord:domestic wastewater irrigation;nitrogen and phosphorus;rice;yield |
| Author Name | Affiliation | E-mail | | YIN Ai-jing | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing 210014, China | | | XUE Li-hong | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | njxuelihong@gmail.com | | YANG Lin-zhang | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Synthetic Innovation Center for Coastal Bio-agriculture, Yancheng 224002, China | | | DUAN Jing-jing | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | HOU Peng-fu | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| In this study, rice pot experiment irrigated with domestic wastewater in different N and P concentrations was carried out to investigate the effects on rice growth, yield and uptakes of N and P. Compared to common chemical fertilizer treatment, domestic wastewater irrigation significantly decreased the concentrations of N and P in the surface water, and the N and P concentrations decreased to the level of zero-N fertilizer treatment about 70 day after transplant. The growth status and yields of rice was closely related to the concentrations of N and P in domestic wastewater under normal irrigation without chemical fertilizer input condition. The spikelet number per panicle,1000-grain weight, and filled spikelets rate were increased, but the panicle number was significantly decreased with domestic wastewater irrigation, therefore, the final yield showed a decreasion. When the TN and TP concentration in domestic wastewater was 20~25 mg·L-1 and 1.0~1.5 mg·L-1, the rice yield could be 95% of that with normal chemical fertilizer and the difference was not significant, but the N and P inputs by domestic wastewater were only 64.1% and 23.2% of normal chemical fertilizer treatment. The N and P use efficiency of rice was enhanced by domestic wastewater irrigation when compared to the normal chemical fertilizer treatment. The uptakes of N and P by rice were positively correlated with the concentrations of N and P in the domestic wastewater, and a positive interaction between N and P in domestic wastewater was observed. If paddy fields was irrigated with domestic wastewater, a certain amount of chemical fertilizer should be applied during tillering stage to ensure the high yield of rice. |
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