ASSOCIAÇÃO DE MESOTRIONA, TEMBOTRIONA E NICOSULFURON COM ATRAZINA EM PÓS TARDE DO MILHO PARA CONTROLE DE PLANTAS DANINHAS

Abstract

Corn crop, although considered competitive, can be severely affected by weed interference, reducing grain yield. Among the alternatives for weed control, chemical control has been frequently used. The objective of this work was to evaluate the efficiency of control and phytotoxicity of mesotrione, tembotrione and nicosulfuron mixed with atrazine applied in late post-emergence in corn. The experiment was in randomized blocks design with four treatments using herbicides and four replications. The treatments consisted of the application of atrazine alone (3 L p.c.ha-1); atrazine associated with mesotrione, tembotrione and nicosulfuron (3 L p.c.ha-1 + 0.5 L p.c.ha- 1); weeded witness and witness without weeding. Data on plant height, stem and ear diameter, flowering time, ear insertion height, weight of a thousand grains, dry weight and productivity were collected. Evaluations of control efficiency and phytotoxicity of the culture were performed at 7, 14, 21 and 28 days after application. It was concluded that the best treatment for weed control was the combination of mesotrione + atrazine and tembotrione + atrazine.