Different doses of herbicides in weed control in the rubber tree

Abstract

In two experiments, conducted in southern Bahia, Brazil, the possibility to reduce the quantity of herbicides used, isolated or mixed, in the weed control of rubber (Hevea spp.) plantation was studied by testing the following products: diuron-hexazinone (2.0 and 1.3 kg/ha): glyphosate (1.5 and 1,0 kg/ha); diuron-ametrine + paraquat (3.0 + 0.2 and 2.0 + 0.2 kg/ha); oxifluorfen + paraquat (1.5 + 0.2 and 1.0 + 0.2 kg/ha) plus a control plot with no herbicides applied. The results were similar in the two experiments. Thus, it is possible to reduce in one third the herbicide doses commonly recommended, except for glyphosate and oxifluorfen + paraquat in those areas where the dicotyledonous predominate.