Abstract
Vinasse is a byproduct of the process of distillation of sugarcane juice for the manufacture of sugar and alcohol. Because it is rich in nutrients, mainly potassium (K), is used as fertilizer and applied via fertigation, without concerning for the fate of this compound in the soil. Thus, the objective of the study was to evaluate the interactions of the potassium ion (K+), applied via vinasse in a soil representative of the sugarcane zone of the State of Pernambuco using adsorption isotherms. The methodology was based on physical, chemical and soil mineralogical characterization, as well as equilibrium batch tests, where the experimental curves were fitted by Langmuir and Freundlich isotherm models. The results allowed to infer that the Freundlich model showed better fit of the curve in both forms: linear and non-linear (direct fit); the non-linear model was selected due to the values of coefficient of determination (R²). The interaction between potassium and soil occurred mainly with organic matter and the presence of soil kaolinite, because they showed negative ions on the external surface, thereby promoting potassium adsorption. Soil potassium adsorption capacity was higher for the first layer (0-20 cm) and decreased along the depth profile.
Highlights
Vinasse is a by-product originated from the distillation of sugarcane juice during the industrialization process to form sugar or alcohol
The studied area has history of six years under the use of vinasse, from the fermentation of sugarcane juice, through fertigation, where once a year was applied rates of 20 mm.ha-1; in the last year, the rate was changed to 30 mm.ha-1 of diluted vinasse, at the proportion of 1:1
The values of soil granulometry showed an increase in clay content in the layers, from 7.33 to 8.23%, consecutively
Summary
Vinasse is a by-product originated from the distillation of sugarcane juice during the industrialization process to form sugar or alcohol. For many years, this effluent has not had a correct disposal or legislation guiding and supervising the producers. This effluent has not had a correct disposal or legislation guiding and supervising the producers It was disposed “fresh”, with very high temperature, on river beds, . In the understanding that by applying higher doses one can expect increase in the profits, for both the saving with fertilization and the increase in agricultural yield, has systematically applied vinasse in soil, contaminating the surface and underground water sources. K favors sugarcane vegetation and tillering, because it acts in various physiological aspects, but the excess of this nutrient may deregulate various structural and metabolic functions of the plant
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