Avaliação química de fertilizantes com micronutrientes tipo fritas

The analysis of Brazilian commercial FTE fertilizers was the objective of this study, under application of routine laboratory methods used for the analysis of non-FTE fertilizers. Cd, Ni, and Pb contents were also determined. The methods proved to be adequate for the analysis of FTE fertilizers. This indicates that FTE fertilizers on the Brazilian market are not really FTE fertilizers; that is, they are not silicates founded with micronutrients. Uncontrolled contents of metal micronutrients in the products, as well as high concentrations of undesirable metals, mainly Pb, are strong indicators for the use of industrial by-products in the fabrication of these fertilizers. It is recommended further studies and suggestions for chemical extractants in order to evaluate the agronomic efficiency of these products.