Increase in cation exchange capacity by the action of maize rhizosphere on Mg or Fe biotite-rich rocks

ABSTRACT The weathering of some silicate minerals in crushed rocks may occur in a few days of cropping and generate different physicochemical properties, with potential benefits to tropical soils. This study aimed to investigate the infuence of maize (Zea mays L.) rhizosphere on the weathering products and on the cation exchange capacity of Mg-biotite from biotite schist and Fe-biotite from biotite syenite. An experiment was carried out in pots, so that plants and crushed rock materials could be evaluated during seven successive growth cycles. The nutrients iron and potassium were taken up from biotite schist and biotite syenite during cropping. The weathering of both biotites promoted by the rhizosphere caused mineralogical changes. The most expressive change in the X-ray diffraction patterns occurred in the < 53 µm particle size fraction; however, the 53-300 µm fractions also changed. The alteration in the Mg-biotite, which has a lower Fe/Mg relation in octahedral sites than the Fe-biotite, was responsible for the most expressive cation exchange capacity increase in the fractions < 300 µm. However, the Fe-biotite weathering process, which presents a higher Fe/Mg relation in octahedral sites, did not increase the cation exchange capacity.

Bibliographic Details

Main Authors:	Krahl,Luise Lottici, Marchi,Giuliano, Paz,Simone Patrícia Aranha, Angélica,Rômulo Simões, Sousa-Silva,José Carlos, Valadares,Leonardo Fonseca, Martins,Éder de Souza
Format:	Digital revista
Language:	English
Published:	Escola de Agronomia/UFG 2022
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-40632022000100221
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