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It intend with experiment evaluate the performance of the acetochlor herbicide by itself tank mix with nicosulfuron, applied in post emergency on the following weeds: Cenchrus echinatus, Digitaria horizontalis, Indigofera hirsuta, Portulaca oleracea, Ipomoea grandifolia. The experiment was conducted at the FCAV-UNESP CAMPUS, in Jaboticabal – SP, on red oxissol. Late on, it was evaluated the possible toxicity symptoms on the maize. The treatments were: acetochlor + nicosulfuron a 1,68 + 0,032; 2,52 + 0,032 and 3,36 + 0,032 Kg/ha, nicosulfuron a 0,032 Kg/ha, in two sprayer age, compered of the witness with and without weeds. The weeds ages application were early (2 leaf) and late (4 to 6 leaf) post emergency. The herbicides were applied with costal sprayer, to constant pressure (40 lbf/pol2 ), with four nozzles XR 11002. The equivalent spray volume was 200 L/ha, and the maize used was Ag 3010. To the C. echinatus the mixture acetochlor + nicosulfuron, in all the rates tested, can are applied latiest, why earned with residual. But to the other weeds evaluated, have to accomplish the herbicides aplication the earliest, and but acetochlor + nicosulfuron mixture have best residual effect. Haven’t diference to control between smaller rate (1,68 + 0,032) and larger rate (3,36 +0,032) at mixture. Despite the slightely reduction in the beginnig on maize treated with acetochlor, they recovered quikly making possible the utilization of the acetochlor on the tested hybrid.

Influência da época de controle das plantas daninhas, sobre a eficácia do herbicida acetochlor em milho