Abstract
Addition of micronutrients to npk formulation and initial development of maize plants
Highlights
There are seven micronutrients (B, Cl, Cu, Fe, Mn, Mo and Zn) satisfying the essentiality criteria and are, considered essential for plant development (VALE, 2000); the low natural levels of micronutrients in soils are insufficient to guarantee maximum yields
This study compared the availability of zinc, boron, manganese and copper to the soil, their absorption, accumulation and effect in developing maize plants, supplied as granules mixed with NPK granules or as powder, coating NPK granules
These results can be related to results of Galrão (1986), who states that a single broadcast application of Zn at 6.0 kg ha-1, with incorporation in total area, was enough for four maize crops in a soil classified as dark-red clay oxisol
Summary
There are seven micronutrients (B, Cl, Cu, Fe, Mn, Mo and Zn) satisfying the essentiality criteria and are, considered essential for plant development (VALE, 2000); the low natural levels of micronutrients in soils are insufficient to guarantee maximum yields. The main role of these four micronutrients in this crop include Zn as enzyme activator, precursor of amino acids and hormones and participant in tissue growth process, which means that maize is one of the crops with fastest responses to Zn application, providing gains in dry matter and grain production. Manganese acts on the synthesis of secondary metabolites and amino acids, while Cu is an important enzyme activator with vital role in photosynthesis, respiration, metabolism of carbohydrates and proteins and cell wall formation (FAVARIN et al, 2008)
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