Phosphorus interception in floodwater of paddy field during the rice-growing season in TaiHu Lake Basin |
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Authors: | Zhang Zhijian Zhang Jianying He Ruo Wang Zhaode Zhu Yinmei |
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Institution: | Center of Eco-environmental Sciences, College of Environmental and Resource Sciences, ZheJiang University, KuanXian Avenue 268, HangZhou, ZheJiang Province, 310029, China. zhangzhijian@zju.edu.cn |
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Abstract: | A field experiment located in TaiHu Lake Basin in China was conducted, by application of superphosphate or a mixture of superphosphate with manure, to elucidate the interception of P export during a typical rice growing season through 'zero-drainage water management' combined with sound irrigation, rainfall forecasting and field drying. P concentrations in floodwater rapidly declined before the first event of field drying, and subsequently tended to return to the background levels. Before the first field drying TPP was the predominant P form in floodwater on fields with no P input, DRP on plots that received superphosphate only, and DOP on plots treated with the mixture of superphosphate and manure. Thereafter TPP became the major form. No P export was found from the paddy fields, but a retention of 0.65kgha(-1), mainly due to soil P sorption. The results recommend the zero-drainage water management for full-scale areas for minimizing P export. |
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