SOLUBILIZAÃÃO DE PÃ DE BASALTO POR MEIO DE VINHAÃA: VARIAÃÃO DE pH E NUTRIENTES DISPONÃVEIS

O objetivo do trabalho foi avaliar o efeito da mistura de pó de basalto e vinhaça na alteração do pH e na disponibilização de elementos importantes para nutrição mineral de plantas, visando a aplicação desses materiais na adubação de solos, contribuindo para o aproveitamento de resíduos agroindustriais e de mineração. Foram realizados três ensaios (E1, E2 e E3). Em E1 e E2 foi avaliado o efeito da agitação no pH da mistura e em E3, em ensaio sem agitação, foram avaliadas a variação de pH e a liberação de íons solúveis importantes para nutrição de plantas. Os ensaios foram realizados em bancada, em três repetições, em erlenmeyers de 125 mL. Na comparação de E1 com E2 não houve efeito da agitação e não houve variação significativa do pH de misturas de vinhaça com pó de basalto. Em E3, ao final de 180 minutos de incubação, os teores de cálcio, ferro e manganês nas misturas de vinhaça e pó de basalto apresentaram aumentos significativos. Conclui-se que misturas de vinhaça e pó de rocha podem ser alternativa no aproveitamento de resíduos de mineração e da indústria sucroalcooleira, mas são necessários estudos para avaliar o efeito em solos e plantas

Effect of rock powder and vinasse on two types of soils

Can vinasse accelerate the change of minerals in rock dust to obtain fertilizers, using residues from alcohol agro-industries and mining? Answering this question was the main objective of this study. Therefore, an experiment was set up in the laboratory in a completely randomized design using Polyvinyl Chloride (PVC) columns, in which the 0-50 cm layers of a clayey soil (eutroferric Red Oxisol) and sandy soil (Typic Quartzipsamment) were reproduced. We applied three different rates of basalt powder (0.0; 2.0, and 4.0 t ha-1) and one rate of vinasse (200 m³ ha-1) to the soils. The control was made by treatments with water (200 m³ ha-1) with the same rates of rock powder. Samples were first collected on the surface of each column (1, 15, 30, 45, 60, and 90 days after the application of vinasse and rock powder), and, at the end of the experiment, at the various depths and in leached water, to determine pH and the concentration of soluble Ca2+, Mg2+, and K+. There was a significant effect of the solvent and the soil on the surface layer, with higher concentrations found in the treatments with vinasse and in clayey soil, confirming the potential of vinasse to alter minerals in basalt powder. The resulting levels from the beginning to the end of the experiment suggest that sorption phenomena with neoformed mineral phases or organic acids may have occurred. It may be concluded that the use of rock powder and vinasse mixtures is a promising alternative for soil fertilization and recycling of waste from the sugarcane and mining industries

Effect of rock powder and vinasse on two types of soils

Can vinasse accelerate the change of minerals in rock dust to obtain fertilizers, using residues from alcohol agro-industries and mining? Answering this question was the main objective of this study. Therefore, an experiment was set up in the laboratory in a completely randomized design using Polyvinyl Chloride (PVC) columns, in which the 0-50 cm layers of a clayey soil (eutroferric Red Oxisol) and sandy soil (Typic Quartzipsamment) were reproduced. We applied three different rates of basalt powder (0.0; 2.0, and 4.0 t ha-1) and one rate of vinasse (200 m³ ha-1) to the soils. The control was made by treatments with water (200 m³ ha-1) with the same rates of rock powder. Samples were first collected on the surface of each column (1, 15, 30, 45, 60, and 90 days after the application of vinasse and rock powder), and, at the end of the experiment, at the various depths and in leached water, to determine pH and the concentration of soluble Ca2+, Mg2+, and K+. There was a significant effect of the solvent and the soil on the surface layer, with higher concentrations found in the treatments with vinasse and in clayey soil, confirming the potential of vinasse to alter minerals in basalt powder. The resulting levels from the beginning to the end of the experiment suggest that sorption phenomena with neoformed mineral phases or organic acids may have occurred. It may be concluded that the use of rock powder and vinasse mixtures is a promising alternative for soil fertilization and recycling of waste from the sugarcane and mining industries