BIOCARV?O COMO ATENUANTE DA FITOTOXICIDADE DE HERBICIDAS EM MUDAS PRé-BROTADAS DE CANA-DEA?úCAR

摘要

The objective of this work was to evaluate the effect of biochar on the sensitivity of presprouted seedlings (MPB) of sugarcane to the clomazone, imazapic and indaziflam appliedin pre-planting alone or in combination. Two varieties of sugarcane (RB 975952 and RB985476) were evaluated. The experimental design was completely randomized with 4replications, using a 9 x 2 factorial scheme, with nine treatments (imazapic 52.5 and 200 gia ha-1, clomazone 1000 g ia ha-1, indaziflam 100 g i.a. ha-1, associations of imazapic +clomazone (52.5 + 600; 52.5 + 1000; 200 + 600 and 200 + 1000 g ia ha-1 and control) andthe presence or absence of biochar in the planting furrow pre-sprouted. The variety RB985476 showed sensitivity to the herbicides clomazone and imazapic in pre-planting. Thetoxicity caused by the herbicides imazapic + clomazone decreased due to the effect ofbiochar. Regarding the RB 975952 variety, sensitivity to clomazone alone and in themixture with imazapic was verified, being the biochar effective in reducing phytotoxicity.Indaziflan was selective for the two varieties of MPB’s. The biochar acted more effectivelyfor the clomazone alone or in a mixture with imazapic, being ineffective for the herbicideimazapic alone.