Spray-dried potassium nitrate-containing chitosan/montmorillonite microparticles as potential enhanced efficiency fertilizer

Autor(es)

Messa, Lucas Luiz ^{[1, 2]} ; Souza, Claudinei Fonseca ^[3] ; Faez, Roselena ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, UFSCar, Lab Polymer Mat & Biosorbents, BR-13600970 Araras, SP - Brazil

^[2] Univ Sao Paulo, FZEA, Grad Program Mat Sci & Engn, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Fed Sao Carlos, UFSCar, Res Grp Water Soil & Environm Engn, BR-13600970 Araras, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Polymer Testing; v. 81, JAN 2020.
• Citações Web of Science: 1

Resumo

We developed a novel enhanced efficiency fertilizer based on chitosan (Cs) and montmorillonite clay (MMt) microparticles to prolong the potassium nitrate release. Potassium nitrate-containing chitosan/montmorillonite microparticles were obtained by spray drying technique and sodium tripolyphosphate (1 and 5% of TPP) was used to crosslink the Cs to improve the release properties. The potassium release characteristics of the microparticles in water and soil were determined. We observed a decrease in the swelling ability of the chitosan for crosslinked microparticles with 5% of TPP by 52% and, consequently a reduction in the nutrient release. The kinetic release mechanism of potassium for non-crosslinked and crosslinked microparticles with 1% of TPP involved both intraparticle diffusion and surface diffusion, while the microparticles crosslinked with 5% of TPP was controlled by swelling. The microparticles were capable of maintaining higher concentrations of potassium in the soil during long periods (up to several weeks). The microparticles have great potential for applications in agriculture based on its release efficiency. (AU)

• Processo FAPESP: 14/06566-9 - Híbridos poliméricos para liberação de nutrientes: preparação, caracterização e avaliação in situ no solo
• Beneficiário: Roselena Faez
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 14/09045-0 - Híbridos de Quitosana-Argila para encapsulamento de fertilizantes: preparação e caracterização de microesferas de liberação controlada
• Beneficiário: Lucas Luiz Messa
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica