Application of vinasse in soils: effect on soil charges and particle dispersion / AplicaÃÃo de vinhaÃa em solos: efeito no balanÃo de cargas e dispersÃo de partÃculas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The vinasse is the main byproduct of the ethanol and sugarcane brand production; these activities are in large expansion in Brazil. For a long time the vinasse was launched into water courses, generating negative environmental impacts. One of the alternatives for producers to get rid of vinasse is its addition in soils as fertilizer. Although the effects of vinasse on physical, chemical and biological attributes are well documented, nothing is known about its effect on superficial variable charges of the soil particles, considering the importance to superficial phenomena such as dispersion/flocculation of the soil particles, cation- and anion- exhange-capacity, pesticides and heavy metals sorption. First, the objective of this work was to evaluate the effect of vinasse on superficial variable charges of the clay fraction of soils, and also evaluating the interaction between vinasse and P sorption, considering the importance of the phosphate fertilization in tropical soils highly weathered and the effect of the P on superficial variable charges in oxidic soils. It was also proposed the evaluation and modeling of the aggregate breakdown and dispersion by ultrasonic energy of soil samples amended with vinasse.

ASSUNTO(S)

aggregate breakdown and dispersion modeling sugarcane vinhaÃa point of zero charge (pzc) cargas do solo desagregaÃÃo do solo energia ultrassÃnica vinasse ciencia do solo ponto de carga zero (pcz) potencial zeta soil charges cana-de-aÃÃcar zeta potential modelagem da desagregaÃÃo e dispersÃo do solo aggregate breakdown ultra-sonic energy

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