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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chitosan-Montmorillonite microspheres: A sustainable fertilizer delivery system

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Author(s):
dos Santos, Bruna Rodrigues [1] ; Bacalhau, Fabiana Britti [2] ; Pereira, Tamires dos Santos [1] ; Souza, Claudinei Fonseca [2] ; Faez, Roselena [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Carlos, Lab Mat Polimer & Biossorventes, Araras - Brazil
[2] Univ Fed Sao Carlos, Dept Recursos Nat & Protecao Ambiental, Araras - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Carbohydrate Polymers; v. 127, p. 340-346, AUG 20 2015.
Web of Science Citations: 23
Abstract

Controlled release fertilizers are efficient tools that increase the sustainability of agricultural practices. However, the biodegradability of the matrices and the determination of the release into soil still require some investigation. This paper describes the preparation of potassium-containing microspheres based on chitosan and montmorillonite clay and the in situ soil release. The chitosan-montmorillonite microspheres were prepared using a coagulation method and different proportions of montmorillonite. The structural, thermal and morphological properties as well the water swelling and fertilizer sorption capacity were evaluated. The best formulations were applied in soil, and the fertilizer release was monitored using time-domain reflectometry (TDR). Montmorillonite clay provides better sorption properties than the chitosan microspheres because of the rough and porous surface. Due to these properties, high levels of fertilizer were sorbed onto the material. ChMMT33-containing potassium shows two specific periods of fertilizer release: the first one lasted approximately three days and was assigned to the external fertilizer on the microspheres. The second was assigned to the internal fertilizer. TDR is an important and fast tool and was used to determine the fertilizer release and the ion movement in the soil. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 14/06566-9 - Hybrid polymers for nutrients release: preparation, characterization and in situ evaluation of nutrients release in the soil
Grantee:Roselena Faez
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants