Layered double hydroxides: matrices for storage and source of boron for plant growth

• Autor(a) principal: Castro, Gustavo Franco de
• Data de Publicação: 2018
• Outros Autores: Ferreira, Jader Alves, Eulálio, Denise, Souza, Silas Junior de, Novais, Sarah Vieira, Novais, Roberto Ferreira, Pinto, Frederico Garcia, Tronto, Jairo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: https://doi.org/10.1180/clm.2018.6; http://www.locus.ufv.br/handle/123456789/23026
• topic: Slow-release fertilizer; Plant nutrition; LDH matrix; Micronutrient; Bioassay

The increase of the absorption efficiency of boron (B) by plants is essential for increasing crop productivity. The intercalation of B in MgAl layered double hydroxides (LDHs) is an alternative to evaluating how these materials can provide B to plants. In this work, a MgAl LDH intercalated with borate ions (Mg2Al-B-LDH) was synthesized by the constant pH coprecipitation method, and the material produced was evaluated as a matrix for storage and as a source of B for plants. The Mg2Al-B-LDH was characterized by XRD, ATR-FTIR, TGA-DTA, specific surface area, pore size and volume, and SEM. A bioassay was performed to verify the supply of B to plants from the two sources in the forms of H3BO3 and of Mg2Al-B-LDH to sunflower plants grown in pots. The LDH basal spacing value of 12.0 Å is characteristic of intercalation of tetraborate octahydrate ions [B4O5(OH)42−]·8H2O between the layers. There was an increase in the dry matter (DM) and B content of the plants relative to those treatments where no B was added. The lack of statistical difference for plant yield between the two sources of B suggests a lack of stability of the Mg2Al-B-LDH structure under the acidic condition of the soil.