Interaccion Zn-Cd en el suelo y maiz | Cd-Zn interaction in soil and corn plants
2003
Carrillo-Gonzalez, R. | Cruz-Diaz, J. | Cajuste, L.J.
The potentially toxic elements such as As, Cd, Ni, and Pb, introduced into the ecosystems with a number of residues, may affect the retention mechanisms of essential elements at the soil surface and their availability to the organisms. Inside the plant tissues, the nutrient balance may also change. The available literature describes a wide range of possible Cd and Zn interactions including antagonistic and synergistic effects depending on metal concentration and plant species. This study was carried out in order to obtain information about the effect of Cd applied to soils on the Zn availability and uptake by corn. Increasing doses of Cd and Zn were applied to two calcareous soils (Progreso soil series) from the state of Hidalgo, Mexico. Corn was grown in a greenhouse and after 45 days the soil samples and corn tissue materials were collected, and microelements and Cd were analyzed. The addition of Zn to Tlaxcoapan soil resulted in a slight increase of exchangeable Cd, this may be due to the competition between these two elements for the exchangeable sites on the soil. In Tlalhuelilpan soil, the Cd-DTPA decreased as a result of an increase in Zn concentration; this suggested competition between elements for extractant solution. Cd adsorption on the soil surface was modified by Zn additions, the Zn adsorption isotherms was also changed as a result of the Cd additions to the equilibrium solution. When the Zn concentration was equal to 30 mg kg(-1) and Cd concentration to 40 mg kg(-1) or more, a reduction of Zn uptake by corn plant was observed. Zn addition decreased the depressive effect of Cd on the dry matter production of corn.
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