Influence of treatments with cupric fungicides on the mineral composition of cocoa trees. In: Agrotrópica v. 5 p. 43-51, 1993.

Abstract

The mineral composition of cocoa trees was analysed in three plantations (A- without agrochemical applications, B- and C-, under treatment with cupric fungicides for 5 years and 16 years respectively) to investigate the influence of Cu surplus on the mineral composition. The elements Cu, Fe, Zn, Mn, P, Ca, Mg, K, C, N were measured in the soil and Cu, Fe, Zn, Mn, P, Ca, Mg, K, were measured in tree samples .. The nutrient concentration in the tissues reflected its own concentration in the soil compartment. Afier fungicide applications, the trees in areas B and C showed variations in nutrient concentrations. The most evident alterations (for ex.: Mg decrease in beans and Ca increase in roots and beans) were observed afier the first fungicide application on trees present in area C.