Atributos químicos e físicos do solo influenciados pela aplicação de dejetos suínos em lavoura sob plantio direto

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

13/06/2007

RESUMO

The increase in the confined swine production has generated great volume of slurries, being in general applied on the soil as fertilizers. Thus, fertilizations in excess and, or, continued with this residue will be able to cause environmental impacts undesirable, being distinguished the soil chemical, physical and biological disequilibria, pollution of waters, losses in yield and quality of farming products. The objective of the work was evaluated the effect of the application of increasing doses of slurry swine, in soil chemical and physical attributes in a no tillage system being as referential for the agricultural exploitation of this residue, without reducing the quality and the productive capacity of the soil. This experiment is located, at Campos Novos, SC, and has been carried out since November of 2001, on a Red Distroferric Latosol. The treatments were: 1) Control; 2) Mineral fertilization as the recommendation for the soil and crop requirements, according to Commission of Fertility; 3) Half of the dose with mineral fertilization and half with slurry swine; 4) 25 m3 ha-1 of liquid slurry swine; 5) 50 m3 ha-1 of liquid slurry swine; 6) 100 m3 ha-1 of liquid slurry swine; 7) 200m3 ha-1 of liquid slurry swine; 8) Native forest. The experimental design was of completely random blocks, with split-plots and four replications. The results were submitted to the F test for analysis of variance, and comparisons of the means by t test. The crop system was the succession of maize (Zea mays) and black oat (Avenastrigosa), under the no tillage system. The soil sampling for the chemical analyses was carried during January of 2006, in the layers of 0 - 5; 5 10; 10 - 20 cm depth. The chemical attributes, water pH, phosphorus, potassium, calcium, magnesium, organic carbon contents were determined. The analyzed soil physical attributes were the geometric average diameter, density, macroporosity, microporosity and total porosity. For these experimental conditions, substantial increase in the soil phosphorus and potassium availability was observed. There were no effects of the swine slurry doses on soil acidity, aluminum, calcium and magnesium levels. For the analyzed soil physical attributes was not verified effects of the swine slurry applications

ASSUNTO(S)

esterco suíno adubação orgânica adubação mineral descarte de dejetos agronomia mineral fertilization pig slurry soil disposal swine manure

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