Abstract
The search for highly productive agriculture has considerably increased the use of fertilizers, becoming a worrying source of environmental and health risks. This work reports the preparation and characterization of a controlled phosphorus release system using a multi-layer blend of starch and latex, in different proportions. Infrared spectroscopy and thermogravimetric analysis were used to evaluate the incorporation and interaction of phosphorus with the polymeric matrix. The mechanical properties, and transport properties were evaluated as a function of the addition of latex and mono-ammonium phosphate (MAP) to the starch. The Zero order, Peppas-Sahlin and Korsmeyer-Peppas kinetic models were applied. The results showed that phosphorus is released between 58% to 80% in the analyzed time. The release mechanism depends on the blend composition and the amount of incorporated MAP, indicating that it is possible to adapt the material formulation to meet specific soil needs.
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