Synergy of Phosphate-Controlled Release and Sulfur Oxidation in Novel Polysulfide Composites for Sustainable Fertilization

Author(s)

do Valle, Stella Fortuna ^{[1, 2]} ; Giroto, Amanda Soares ^[2] ; Gestal Reis, Heitor Pontes ^[3] ; Guimaraes, Gelton G. F. ^[4] ; Ribeiro, Caue ^[2]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil

^[3] UNESP Botucatu, Av Univ, BR-18610034 Botucatu, SP - Brazil

^[4] Agr Res & Rural Extens Co Santa Catarina, BR-88318112 Itajai, SC - Brazil

• Document type: Journal article
• Source: Journal of Agricultural and Food Chemistry; v. 69, n. 8, p. 2392-2402, MAR 3 2021.
• Web of Science Citations: 0

Abstract

The development of smart and eco-friendly fertilizers is pivotal to guarantee food security sustainably. Phosphate rock and struvite are promising alternatives for P fertilization; nevertheless, the solubility of these sources is a challenge for consistent use efficiency. Here, we propose using a polysulfide obtained via inverse vulcanization as a novel controlled-release fertilizer matrix in a system containing either Baytivar rock (Bay) or struvite (Str). The polysulfide provides S for plants after being biologically oxidized to sulfate in soil, generating local acidity for P solubilization. After 15 days of soil incubation, the composites with 75 wt % Str and 75 wt % Bay achieved, respectively, 3 and 2 times the S oxidation from the elemental sulfur reference. Results indicated that P content stimulates the soil microorganisms' activity for S oxidation. The matrix had a physical role in improving Bay dissolution and regulating the rapid release from Str. Moreover, the available P in soil was 25-30 mg/dm(3) for Bay composites, while for pure Bay, it was 9 mg/dm(3). (AU)

• FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
• Grantee: Roberto de Campos Giordano
• Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
• FAPESP's process: 18/10104-1 - Nanocomposites Preparation from Urea modified with Glycerol for optimization of Process of Controlled Release of Nutrients
• Grantee: Amanda Soares Giroto
• Support type: Scholarships in Brazil - Post-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