NDLI: Alterações no teor de fósforo no solo com aplicação de dejetos líquidos de suínos

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Alterações no teor de fósforo no solo com aplicação de dejetos líquidos de suínos

Content Provider	Semantic Scholar
Author	Berwanger, Alexandre Léo Ceretta, Carlos Alberto Santos, Danilo Rheinheimer Dos
Copyright Year	2008
Abstract	Pig slurry serves as plant nutrient source, but may cause phosphorus accumulation in the soil when used improperly, which later can be transferred to the aquatic environment causing eutrophication. The objective of this study was to evaluate the potential risk of environmental contamination by continuous use of pig slurry, measuring alterations in phosphorus content in the soil and in the sorption isotherms. The study was carried out at the Universidade Federal de Santa Maria, in a Typic Hapludalf. The effects of applying 0, 40 and 80 m3 ha-1 pig slurry broadcast over the soil surface before sowing of each species in a crop rotation were studied. The pig slurry, applied on the soil surface under no tillage, contained phosphorus quantities superior to those exported by crops, which increased the available soil phosphorus to a depth of 15 cm. The saturation of the soil phosphate adsorption sites, as indicated by the parameters of the Langmuir equation, was proportional to the pig slurry rate. The pig slurry application altered the concentration of phosphorus in the equilibrium solution, the amount of phosphorus desorbed with water and the constant describing the affinity of phosphate for the substratum surface. The observed changes point to a risk of phosphorus desorption in case the sediments are transferred to surface water bodies.
Starting Page	2525
Ending Page	2532
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1590/S0100-06832008000600029
Alternate Webpage(s)	http://www.scielo.br/pdf/rbcs/v32n6/v32n6a29.pdf
Alternate Webpage(s)	https://doi.org/10.1590/S0100-06832008000600029
Volume Number	32
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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