Smart Fertilization Based on Sulfur-Phosphate Composites: Synergy among Materials in a Structure with Multiple Fertilization Roles

Author(s)

Guimaraes, Gelton G. F. ^{[1, 2]} ; Klaic, Rodrigo ^{[1, 3]} ; Giroto, Amanda S. ^{[4, 1]} ; Majaron, Vinicius F. ^{[4, 1]} ; Avansi, Jr., Waldir ^[5] ; Farinas, Cristiane S. ^{[1, 3]} ; Ribeiro, Caue ^[1]

Affiliation

^[1] Embrapa Instrumentat, Rua 15 Novembro, 1452, CP 741, BR-13560970 Sao Carlos, SP - Brazil

^[2] EPAGRI Agr Res & Rural Extens Co Santa Catarina, 6800 Rd Antonio Heil, BR-88318112 Itajai, SC - Brazil

^[3] Univ Fed Sao Carlos, Grad Program Chem Engn, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ Fed Sao Carlos, Dept Chem, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[5] Univ Fed Sao Carlos, Dept Phys, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 6, n. 9, p. 12187-12196, SEP 2018.
• Web of Science Citations: 3

Abstract

Sulfur is currently a bottleneck for agronomic productivity. Many products are based on the application of elemental sulfur (S degrees), but the ability of the soil to oxidize them is variable and dependent on the presence of oxidizing microorganisms. In this work, a composite was designed based on a matrix of S degrees prepared by low-temperature extrusion, reinforced by rock phosphate particles acting as P fertilizer, and with encapsulation of Aspergillus niger as an oxidizing microorganism. This structure was shown to be effective in significantly increasing S degrees oxidation while providing P by rock phosphate dissolution in an acid environment. X-ray absorption near-edge structure (XANES) spectra provided information about P fixation in the soil after dissolution, showing that the composite structure with A. niger modified the nutrient dynamics in the soil. This fully integrated material (a smart fertilizer) is an innovative strategy for eco-friendly agronomic practices, providing high nutrient delivery with minimal source preprocessing. (AU)

• FAPESP's process: 13/11821-5 - Study of Nanosize Phosphate Solubilization Dispersed in Matrices of Different Solubilities
• Grantee: Amanda Soares Giroto
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/09343-6 - DEVELOPMENT AND AGRONOMIC EVALUATION OF A NEW FERTILIZER BASED ON NANOCOMPOSITES SULFUR-PHOSPHATE MINERAL
• Grantee: Gelton Geraldo Fernandes Guimarães
• Support type: Scholarships in Brazil - Post-Doctorate