Efectos de la aplicación de cadmio al suelo en plantas de cacao del clon as-cp 2661

Abstract

The aim of this study was to evaluate The maximum absorption of cadmium (Cd) in different organs of the cocoa plants was evaluated, as well as to determine the bioaccumulation and translocation presented by the clone AS-CP 26-61, when applying different concentrations of Cd in the soil. A completely randomized design was used, with six treatments and three repetitions. The soil used was from the Almirante district, Bocas del Toro, extracted to a depth of 30 cm. The soil was treated with diluted CdSO4 and applied to the surface in doses of 0 mg.kg-1; 4 mg.kg-1; 8 mg.kg-1; 12 mg.kg-1; 16 mg.kg-1 and 20 mg.kg-1. After six months, soil samples were taken at two depths (0 to 15 cm and 15 to 30 cm), as well as roots, stems and leaves, to determine Cd concentrations. Bioaccumulation and translocation factors were analyzed to find out if the evaluated genotype is Cd hyperaccumulator or excluder. According to the results, it was possible to verify that as the doses of Cd applied doses increased, the concentrations of bioavailable Cd in the soil increased. The leaves presented the highest Cd concentration, followed by roots and stems. The cocoa plant behavior with Cd bioaccumulation factors greater than 1 and translocation factors less than 1, corresponds to a phytoaccumulator plant. It is concluded that the evaluated clone AS-CP-2661 does not transfer the metal from the root to the stem and leaves, in doses applied to the soil of less than 8 mg.kg-1.