Recommendation of soil fertilization with copper and zinc for soybean crops grown in Petric Plinthosol

ABSTRACT: Cultivation of soybean and off-season corn is advancing in areas under restricted edaphoclimatic conditions, such as petric plinthosols, which have significant proportions gravel are deficiency micro-nutrients copper (Cu) zinc (Zn). The effects Cu Zn concentrations on nutrition cultivated plinthosol unclear, it unknown whether the levels considered adequate for other soils sufficient gravely soils, or even if higher rates can cause a toxic effect soybean. objective was to compare response grown ferralsol doses identifying changes induced by evaluate residual ferralsol. Four experiments were carried out with applied soil crop plinthosol. leaf tissues crops two showed same rate increase concentrations, each kg·ha-1 applied, 0.7 mg·kg-1, suggesting no difference fertilization between without gravel. dosages Oxysulfate did not corn. highest any plants. main criteria interpreting analysis thus also applicable