Unveiling the Role of Polysulfide Matrices in Phosphate Diffusion for Controlled Release Fertilizers

Author(s)

Valle, Stella F. ; Giroto, Amanda S. ; Ribeiro, Caue

• Document type: Journal article
• Source: ACS APPLIED POLYMER MATERIALS; v. 5, n. 9, p. 9-pg., 2023-08-16.

Abstract

Phosphaterock and struvite (ST) dispersion in a polysulfide (PS)matrix offers a sustainable alternative for phosphorous (P) fertilization,as it can favor P dissolution and control its release, while alsobeing a sulfur fertilizer. Herein, we discuss the PS permeabilitymechanism as well as the chemical and structural factors that affectP diffusion from PS composites. SEM and contact angle showed thatP particles increased PS porosity and hydrophilicity, which favorsP release. Within 7 days in soil, Fe-oxide papers revealed that theP-diffusion diameter was only 0.3 cm for ST against up to 2.3 cm fromthe PS composite. In 28 days, available P in soil from the apatiteincreased from 6 to up to 79 mg/dm(3) due to its dispersionin PS. In the adapted Ussing Chamber permeability test, PS displayedhigher affinity toward anion permeability and a negligible cationdiffusion, which might contribute to the gradual P release and higheravailability in soil. (AU)

• FAPESP's process: 21/13645-6 - Investigation of poly(glycerol-citrate) polymer as protective coating for boosting microbial inoculation effect in soybean plants
• Grantee: Amanda Soares Giroto
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• 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 Opportunities: Scholarships in Brazil - Post-Doctoral