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Studies of coating systems for controlled release of phosphorus with recovery of raw materials utilization in natural granules coated formation OF Mono Ammonium Phosphates (MAP)

Grant number: 15/17588-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2015
Effective date (End): October 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal researcher:Cauê Ribeiro de Oliveira
Grantee:Vanderlei Roncato Junior
Home Institution: Embrapa Instrumentação Agropecuária. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). Ministério da Agricultura, Pecuária e Abastecimento (Brasil). São Carlos , SP, Brazil


The use of agricultural fertilizers is essential to be achieved sustainability goals (environmental, economic and social) and the technology of coated nutrients is closely linked to healthy growing environment, higher productivity and durability of cultivation systems. Typically, in the field, fertilization is poorly controlled, leading to significant losses of inputs, which can be avoided employing slow-release fertilizer nutrients. Among the principal volatilization losses are N, K leaching and N immobilizing P, so that the damage can reach up to 50% of the entire fertilizer applied. A strategy for implementation of the rationalization is to protect the fertilizer with materials that create a physical and / or diffusion barrier to control the input release. However, the release process needs to be adjusted to the demands of the crop that is to be fertilized, which means that changes in the coating structure may be useful to control this release process, seeking and biodegrade thin membranes. Thus, this design aims to study the preparation of coatings derived from natural biomass materials (waxes) or a raw material derived from animals (collagen), evaluating the properties of protective membranes as well as the best encapsulation conditions . Will be evaluated trade beads of phosphorus nutrient (Mono Ammonium Phosphate - MAP) coated and also will assess the best conditions of accession of the film uniformity and thickness, to determine the best parameters of the coating process. The materials coated in batch will be analyzed by microscopy Electronics, Infrared Spectroscopy (FTIR) among other techniques, and the release of the inputs will be made in water and aqueous solutions of different ionic strength, in order to simulate the effect of environmental conditions on the release. This proposal will be conducted in partnership USP and EMBRAPA - Instrumentation, focusing on sustainable alternatives to the widespread use of protective coatings on fertilizer.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BORTOLETTO-SANTOS, RICARDO; FERNANDES GUIMARAES, GELTON GERALDO; RONCATO JUNIOR, VANDERLEI; DA CRUZ, DIEGO FERNANDES; POLITO, WAGNER LUIZ; RIBEIRO, CAUE. Biodegradable oil-based polymeric coatings on urea fertilizer: N release kinetic transformations of urea in soil. Scientia Agricola, v. 77, n. 1 2020. Web of Science Citations: 0.

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