title: Forms of phosphorus transfer in runoff under no-tillage in a soil treated with successive swine effluents applications.
abstract: Successive swine effluent applications can substantially increase the transfer of phosphorus (P) forms in runoff. The aim of this study was to evaluate P accumulation in the soil and transfer of P forms in surface runoff from a Hapludalf soil under no-tillage subjected to successive swine effluent applications. This research was carried out in the Agricultural Engineering Department of the Federal University of Santa Maria, Brazil, from 2004 to 2007, on a Typic Hapludalf soil. Swine effluent rates of 0, 20, 40, and 80 m3 ha(-1) were broadcast over the soil surface prior to sowing of different species in a crop rotation. Soil samples were collected in stratified layers, and the levels of available P were determined. Samples of water runoff from the soil surface were collected throughout the period, and the available, soluble, particulate, and total P were measured. Successive swine effluent applications led to increases in P availability, especially in the soil surface, and P migration through the soil profile. Transfer of P forms was closely associated with runoff, which is directly related to rainfall volume. Swine effluent applications also reduced surface runoff. These results show that in areas with successive swine effluent applications, practices that promote higher water infiltration into the soil are required, e.g., crop rotation and no-tillage system.
authors: Department of Rural Engineering, Federal University of Santa Catarina, Rodovia Admar Gonzaga, 1346, 88034-000, Florianópolis, SC, Brazil, lourenzicr@gmail.com.
authors: Cledimar Rogério
authors: CR
authors: Lourenzi
authors: Carlos Alberto
authors: CA
authors: Ceretta
authors: Tadeu Luis
authors: TL
authors: Tiecher
authors: Felipe
authors: F
authors: Lorensini
authors: Adriana
authors: A
authors: Cancian
authors: Lincon
authors: L
authors: Stefanello
authors: Eduardo
authors: E
authors: Girotto
authors: Renan Costa Beber
authors: RC
authors: Vieira
authors: Paulo Ademar Avelar
authors: PA
authors: Ferreira
authors: Gustavo
authors: G
authors: Brunetto
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D001938:Brazil; D004784:Environmental Monitoring; D008372:Manure; D010758:Phosphorus / Q000032:analysis*; D011891:Rain; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water; D014872:Water Movements
chemical_list: D008372:Manure; D012987:Soil; D012989:Soil Pollutants; D014867:Water; D010758:Phosphorus