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| Influence of domestic sewage irrigation on phosphorus forms and adsorption in paddy soil |
| Received:March 07, 2017 |
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| KeyWord:domestic sewage;rice;phosphorus form;Hedley;phosphorus absorption |
| Author Name | Affiliation | E-mail | | YIN Ai-jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China
Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing 210014, China | | | XUE Li-hong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | njxuelihong@gmail.com | | YANG Lin-zhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China
Jiangsu Synthetic Innovation Center for Coastal Bio-agriculture, Yancheng 224002, China | | | DUAN Jing-jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | |
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| Abstract: |
| In this study,rice pot experiments were performed using irrigation with domestic sewage containing different nitrogen (N) and phosphorus (P) concentrations.Soil P forms were measured with the modified Hedley method,and soil P adsorption characteristics were also investigated under domestic sewage irrigation.N and P inputs from domestic sewage irrigation were much lower than those in common chemical fertilizers.Consequently,soil total P contents decreased slightly,and soil available P decreased significantly after one season of rice cultivation.Chemical fertilizer application mainly increased soil labile P,such as NaHCO3-Pi.Domestic sewage irrigation decreased soil labile P and increased soil moderately labile P,mainly through increases in NaOH-Pi and decreases in NaHCO3-Po.Domestic sewage irrigation also increased soil maximum adsorbing capacity,adsorption intensity,and buffer capacity for P.Higher P concentrations in domestic sewage could significantly increase soil NaOH-Po content,whereas higher N concentrations in domestic sewage could affect soil P forms by increasing the P equilibrium concentration in the soil solution and enhancing the uptake of P by improving rice growth.Thus,these findings demonstrated that domestic sewage irrigation greatly affected soil organic P mineralization;further studies are needed to determine the mechanisms involved in this process. |
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