Revista Brasileira De Herbicidas 2007; 6(2): 50-61
Chemical control quantification of weeds through different uptake forms
DOI: 10.7824/rbh.v6i2.57
The work aimed to quantify the intensity of herbicides action in Brachiaria decumbens (BRADC) and Digitaria horizontalis (DIGHO) control, through different uptake forms. This way, three experiments were carried out in plastic greenhouse conditions represented by atrazine (3.00 kg ha-1 + mineral oil 0.5% v v-1), oxyfluorfen (0.72 kg ha-1) and isoxaflutole (0.06 kg ha-1) herbicides, applied in initial post-emergence. Three uptake possibilities (root, foliar and root + foliar) and a check treatment were studied, in sandy and clay soils, constituted by 4×2 factorial design, with five replications. For the isolation of uptake herbicides it was used plastic tubes and aluminum paper to guarantee the presence or absence of seedlings or soil protection. It was observed that isoxaflutole foliar and root uptake controlled BRADC efficiently in sandy and clay soils to 15 DAA (days after application). For DIGHO, isoxaflutole provided efficient control by root route, in the order of 1.9 and 5.6 times, superior than foliar route for sandy and clay soils to 15 DAA. Oxyfluorfen foliar uptake controlled BRADC (> 93%) in the order of 16.8 and 15.1 times superior than root route for sandy and clay soils. DIGHO specie was not satisfactorily controlled by atrazine and oxyfluorfen herbicides for none of different uptake routes and soil types.
170