title: [Phosphorus behavior in soil-water system of paddy field and its environmental impact].
abstract: A field experiment with rice showed that P fertilizer application increased the concentrations of resin P in soil and total P in soil surface water, and both of them declined subsequently over time. Compared with applying mineral P fertilizer only, the integrated application of mineral-P and manure resulted in a higher resin P level within 20 days after P application. The total P concentration in soil surface water in the treatment of integrated application of mineral-P and manure was 3.4 times higher than that in the treatment of mineral-P fertilizer application only after 7 days of P application, and also, was 2.8 times higher than that in the treatment where P application rate was doubled. The potential of Ploss from surface water in the treatment of integrated application with manure was more than that in the treatment of applying-P fertilizer only. The effect of applied P sorts on P concentration in soil surface water could be ignored after 33 days of P application. Two drainages were conducted for rice growth, which caused the net P loss loading and its apparent P loss ratio in range of -0.038-0.076 kg.m-2 and 0.034-0.100%, respectively. To minimize P loss from rice production area, field drainage should be avoided in the initial week of P-fertilizer application or field harrowing.
authors.affiliation: College of Environment and Natural Resources, Zhejing University, Hangzhou 310029.
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Zhu
authors.forename: K
authors.initials: K
authors.lastname: Wang
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Dong
mesh_terms: D004777:Environment; D005308:Fertilizers; D012275:Oryza / Q000254:growth & development*; D010758:Phosphorus / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014867:Water / Q000032:analysis*
chemical_list: D005308:Fertilizers; D012987:Soil; D014867:Water; D010758:Phosphorus