TITLE:
Influence of Bentonite and MB4 on the Chemical Characteristics of an Oxisol
AUTHORS:
Gilvanise Alves Tito, Lúcia Helena Garófalo Chaves, Felipe Guedes Souza, Antônio Ramos Cavalcante, Josely Dantas Fernandes, Ana Carolina Feitosa de Vasconcelos
KEYWORDS:
Soil Conditioner, Nutrients, Rock Dust
JOURNAL NAME:
Agricultural Sciences,
Vol.10 No.5,
May
23,
2019
ABSTRACT: The growing concern with the quality of life and the environment, due to the degradation of natural resources and their contamination, mainly with agrochemicals, led to the emergence of a sustainable or alternative agriculture. The objective of this study was to evaluate the effect of the addition of increasing doses of bentonite and MB4 on the availability of nutrients to the soil. The experiment consisted of a 4 × 4 factorial, bentonite doses (0, 30, 60 and 90 t⋅ha−1) and MB4 doses (0, 3, 6 and 9 t⋅ha−1) with three replications. The soil mixtures with the treatments were conditioned in the plastic pots, incubated for 90 days in a greenhouse, and chemically analyzed. Data were submitted to analysis of variance and comparison of means by the Tukey test. Increasing doses of bentonite and MB4 promoted an increase in the calcium (Ca), magnesium (Mg) in the soil sample either alone or the mixture of two factors, except for the mixture of the Ca Mg doses. Increasing doses of bentonite increased the cation exchange capacity of the soil, favoring the availability of nutrients in the soil. The increasing doses of MB4 favored the increase of the pH values and, consequently, decreased the soil potential acidity values for the applied bentonite doses. On the other hand, these treatments decreased the cation exchange capacity of the soil.