Phosphorus interception in floodwater of paddy field during the rice-growing season in TaiHu Lake Basin.
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.
Zhang
Zhijian
Z
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
Zhang
Jianying
J
He
Ruo
R
Wang
Zhaode
Z
Zhu
Yinmei
Y
D000383:Agriculture; D002681:China; D004190:Disasters; D004784:Environmental Monitoring / Q000379:methods; D005308:Fertilizers / Q000032:analysis*; D005618:Fresh Water / Q000032:analysis; D008372:Manure; D012275:Oryza; D010758:Phosphorus / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis; D014881:Water Supply
D005308:Fertilizers; D008372:Manure; D012987:Soil; D014874:Water Pollutants, Chemical; D010758:Phosphorus