Strategy for Multinutrient Application in Integrated Granules Using Zein as a Coating Layer

Autor(es)

Bortoletto-Santos, Ricardo ^{[1, 2]} ; Plotegher, Fabio ^[1] ; Roncato, Vanderlei ^[2] ; Majaron, Rafaela F. ^[3] ; Majaron, Vinicius F. ^[3] ; Polito, Wagner L. ^[2] ; Ribeiro, Caue ^[1]

Afiliação do(s) autor(es)

^[1] Embrapa Instrumentacao, LNNA, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, Campus Sao Carlos, Ave Trabalhador Sao Carlens 400, BR-13566590 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Quim, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Agricultural and Food Chemistry; v. 66, n. 37, p. 9582-9587, SEP 19 2018.
• Citações Web of Science: 2

Resumo

The efficiency of phosphate fertilizers is strongly limited by the acidity and high iron content and aluminum based compounds in soils due to high P fixation. Coatings have been proposed as an alternative solution to reduce P losses by controlling the fertilizer release, but the literature is not conclusive about the most adequate material for that purpose. Herein we report a novel Zn-based coating for monoammonium phosphate (MAP) granules comprising ZnO nanoparticles and zein as a bicoating structure. Samples were prepared by dispersing ZnO and zein on the MAP surface and characterized, comparing the release in neutral and acidic solutions over time. Coating thickness/quality determined the nutrient release by a physical barrier effect. The results show that the zein coating overprotection avoids a fast nutrient release, keeping the local acid medium necessary to suppress ZnPO4 precipitation. A range of 2.5 to 10.0 wt % of zein was studied, indicating that 2.5 wt % coatings just present significant release control, which is similar until 10.0 wt % coating. (AU)

• Processo FAPESP: 17/11149-6 - Desenvolvimento de nanocompósitos à base de enxofre elementar para veiculação de micronutrientes em solo
• Beneficiário: Fábio Plotegher
• Modalidade de apoio: Bolsas no Brasil - Pesquisa Inovativa em Pequenas Empresas - PIPE