MICRONUTRIENTS LEVELS IN COMMON BEAN cv.'BRSMG MADREPEROLA' ON SOIL CONTAMINATED WITH CHROMIUM

摘要

Some elements, such as chromium (Cr), are essential for animals and are not for plants. Cr is found in the environment in the following oxidation states: III and VI. Cr (III) is essential for animals because it acts on glucose metabolism and is even used in food supplementation in humans. The Cr (VI) has greater oxidative power and greater permeability in the cellular membrane, being then more toxic than Cr (III). In plants, Cr appears to be more toxic to roots than to shoots, severely reducing rootgrowth. It affects the germination, growth and plants development in general, as it promotes oxidative stress and nutritional imbalance. The oxidation state and the mobility of Cr in soil are influenced by factors such as organic matter, clay content, Al, Fe, Mn and pH. These relationships influence the dynamics of the metal in soil and contribute to lower risk conditions, as the less toxic oxidation state is favored by the environmental conditions.