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vol.39 número6POTENCIAL DO EXTRATO DE CÚRCUMA E SUAS FRAÇÕES PARA CONTROLAR MOSCA DO PÊSSEGO (DIPTERA: TEPHRITIDAE)EQUAÇÕES PARA PREDIZER A ENERGIA METABOLIZÁVEL DA FARINHA DE CARNE E OSSOS PARA SUÍNOS EM CRESCIMENTO índice de autoresíndice de assuntospesquisa de artigos
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Ciência e Agrotecnologia

versão impressa ISSN 1413-7054versão On-line ISSN 1981-1829

Resumo

PESSOA, Rodrigo Souza et al. SOLUBILIZATION OF POTASSIUM FROM ALTERNATIVE ROCKS BY HUMIC AND CITRIC ACIDS AND COFFEE HUSK. Ciênc. agrotec. [online]. 2015, vol.39, n.6, pp.553-564. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542015000600002.

Brazil imports most of the potassium that it consumes in agriculture, however, such huge external dependence can be minimized with the use of alternative local K bearing rocks. This experiment was conducted with the objective of evaluating the solubility of nepheline syenite and glauconite as a function of three organic matrices, humic acid, citric acid and coffee husk. Incubation of low grade K rocks and organic matrices were done in laboratory conditions, in a completely randomized design. Each rock was mixed with five different doses of each organic matrix and the potassium solubilized was measured periodically, during 180 days. Regardless of the organic matrix and its dose investigated, nepheline syenite samples released more K than the modified glauconite. Soluble K increased as the incubation time increased and its release was greater as the organic matrix dose increased. There was more soluble K when the coffee husk was mixed with the potassic rocks, in relation to the humic and citric acids.

Palavras-chave : Low grade K rocks; alternative source of K; rock weathering; organic matrices.

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