Formas de perdas de cobre e fósforo em água de escoamento superficial e percolação em solo sob aplicações sucessivas de dejeto líquido de suínos

Abstract

RESUMO As aplicações sucessivas de dejeto líquido de suínos podem aumentar os teores de cobre e fósforo na

Modeling Zinc and Copper Movement in an Oxisol under Long‐Term Pig Slurry Amendments

“…Failure to account for such colloidal processes during solute transport simulations may lead to a severe underestimation of the transport and the potential risk assessment for considered TMs (Šimůnek et al, 2006). Considering the findings of Girotto et al (2010b) that Cu in water leached from a PS-amended soil occurred predominantly (approximately 75%) in particulate forms, the colloid-facilitated transport probably represents a process that is not well described by the validation simulations for Cu movement in the case of the PS-amended Oxisol studied here. Such particulate movement is less relevant in simulations of Zn transport in the soil profile because Zn movement in soils is considered to occur mainly (³85%) in a dissolved, free ion form (Citeau et al, 2003).…”

Effects of Pig Slurry Application and Crops on Phosphorus Content in Soil and the Chemical Species in Solution

“…The predominance of these P species in solution in this study possibly contributed to the accumulation of P in oat and maize tissues (Table 3). However, free species can be transferred by runoff and leached solution, raising the potential of environmental contamination (Girotto et al, 2010).…”

“…0-5, 5-10, 10-20, 20-30, 30-40 e 40-60 (Schachtman et al, 1998). But the phosphate forming an ion pair with Ca and Mg that originates the species CaHPO 4(aq) and MgHPO 4(aq) are transferable, increasing the risk of environmental contamination (Girotto et al, 2010).…”

“…Phosphate in the soil solution can interact as a ligand with soluble cations such as Ca, Mg, Fe, and Al, among others, changing their availability and mobility (Girotto et al, 2010;Oburger et al, 2011). Continued applications of PS, a multielement fertilizer, are expected to induce changes in the chemical composition and distribution of P species in the soil solution, together with crop cultivation, which can alter the concentration of elements in the soil solution by absorption and accumulation in plant tissues, by exudation of organic compounds and by changes in pH through the release of OH -or H + (Gahoonia et al, 1992).…”

“…Continued applications of PS, a multielement fertilizer, are expected to induce changes in the chemical composition and distribution of P species in the soil solution, together with crop cultivation, which can alter the concentration of elements in the soil solution by absorption and accumulation in plant tissues, by exudation of organic compounds and by changes in pH through the release of OH -or H + (Gahoonia et al, 1992). The P species in soil solution can be estimated with specific software such as Visual Minteq, since P bioavailability and mobility depend on the concentration and chemical species in the solution (Nolla and Anghinoni, 2006;Zambrosi et al, 2007;Girotto et al, 2010).…”