Selectivity of herbicides on the growth of initial culture of açai (Euterpe oleracea Mart.)

Abstract

Due to the expansion of cultivation in different traditional areas of acai, technical information are necessary for its economic output. Between these areas are the floodplains systematized in the state of Tocantins. The initial slow growth characteristic of this species is competition from weeds a major concern in the production system. This research aimed to evaluate the toxicity of herbicides applied post-emergence at different stages of the main crop. The experiment consisted of a randomized block design with four replications installed on 13 X 3 factorial design with four replications. At 7, 16, 25 and 34 days after application (DAA), we determined the percentage of intoxication in relation compared with the control. At the end of 60 DAA plants were harvested and measured their height, stem diameter and placed to dry for determination of the vegetative components of dry mass. Herbicides that promoted greater reduction in the assessed variables were carfentrazone, bentazon, diuron, 2,4 - D, imazetaphir and oxyfluorfem. The most promising herbicides for use in the culture of Açai were atrazine, fluazipfop, linuron, mesotrione and bispyribac sodium.