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- Title
Increase in cation exchange capacity by the action of maize rhizosphere on Mg or Fe biotite-rich rocks.
- Authors
Lottici Krahl, Luise; Marchi, Giuliano; Aranha Paz, Simone Patrícia; Simões Angélica, Rômulo; Carlos Sousa-Silva, José; Fonseca Valadares, Leonardo; de Souza Martins, Éder
- 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 influence 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 Febiotite, 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.
- Subjects
POTASSIUM silicate; SILICATE minerals; RHIZOSPHERE; DIFFRACTION patterns; WEATHERING; BIOTITE; X-ray diffraction
- Publication
Agricultural Research in the Tropics / Pesquisa Agropecuária Tropical, 2022, Vol 52, p1
- ISSN
1517-6398
- Publication type
Article
- DOI
10.1590/1983-40632022v5272376