Details

Autor(en) / Beteiligte

• Santos, Bruna Rodrigues dos
• Bacalhau, Fabiana Britti
• Pereira, Tamires dos Santos
• Souza, Claudinei Fonseca
• Faez, Roselena

Titel

Chitosan-Montmorillonite microspheres: A sustainable fertilizer delivery system

Ist Teil von

• Carbohydrate polymers, 2015-08, Vol.127, p.340-346

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2015

Quelle

MEDLINE

Beschreibungen/Notizen

• •Chitosan-montmorillonite microspheres were prepared as controlled release fertilizer; Chitosan-clay composites demonstrate to be an efficient sorbent to potassium fertilizer in a sorption-dessorption process; in situ determination of the potassium-containing material was monitored by an electromagnetic technique. 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.