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Effect of different biofertilizers produced by the anaerobic digestion of manipueira in soil chemical characteristics.

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009046.(doi:10.13031/2013.29791)
Authors:   Keles Regina Antony Inoue, Cecília de Fátima Souza, Ilda de Fátima Ferreira Tinôco, Maria Clara Carvalho Guimarães, Irene Menegali, Elton Eduardo Novais Alves
Keywords:   Keywords: Anaerobic digestion; organic matter; soil; nutrients; waste management.

Resumo. The cassava processing industries generate different types of waste, among which stands out the cassava wastewater, an effluent of the cassava pressing to produce flour or starch, named manipueira. It is considered pollutant due to its high organic load and toxic, due the presence of highly toxic cyanide compound. This waste can be treated by anaerobic digestion, with generation of by-products as biogas and biofertilizer. The objective of this work was to evaluate the effect of the combination of biofertilizers produced from the anaerobic digestion of the "manipueira", in specific doses, on the soil chemical properties (concentrations of phosphorus, sodium, potassium, nitrogen and calcium magnesium , besides exchangeable acidity, potential acidity, pH and electrical conductivity). The experiment was carried out in the Laboratory of Anaerobic Digestion, Department of Agricultural Engineering, Federal University of Viosa, Minas Gerais, Brazil. To assemble the experiment, plastic pots of 7.5 liters were used, put in benches and filled with soil Haplic Cambisol Tb latosol Distrophic, where corn was grown. The fertilization was done according to the specific recommendations for this culture. The experimental design was completely randomized, with 9 treatments resulting from the combination of 3 biofertilizers with 3 doses and a control. The means were evaluated by the Dunnett test. The treatments associated with higher doses of biofertilizer resulted in values of electrical conductivity that differed from the control and also in different concentrations of calcium magnesium, total phosphorus, potassium and sodium (total and available). The application of lower dose of biofertilizer did not alter the concentration of chemical elements in soil evaluated.

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