Cationic micronutrients: sources, doses and environments

Abstract

The objective of this work was to characterize the availability of Cu, Mn and Zn in four Latosols Triângulo Mineiro, using fertilizers in the form of EDTA chelates, oxides and sulfate. The experimental design was completely randomized in a factorial arrangement (3 x 8), and the combination of three sources (chelates EDTA, and in the forms of oxide and sulphate) in eight concentrations (10, 20, 40, 60, 80, 100, 120 and 140 mg L-1 micronutrient) with three replications in each soil. The fertilizer EDTA chelate is more efficient in the availability of Cu and Zn compared to other tested sources (liquid and sulfated source), the evaluated soils. The use of fertilizer EDTA chelate base provides an increase in Cu concentration (copper) and Zn (zinc) in the evaluated soils (Yellow Oxisol medium texture - soy cultivation and Yellow Oxisol medium texture - maize crop). Samples from the very clayey Oxisol (native savannah) the availability of Cu increases linearly as a function of the application of savannah fertilizer (EDTA). The chelated fertilizer (EDTA) increases linearly more sharply Zn levels in soil samples Oxisol clayey and Oxisol of medium texture. In general, the application of fertilizer chelated (EDTA) provides increases in levels of Cu and Zn.