Revista Brasileira De Herbicidas 2005; 4(1): 120-132
EFFICACY OF ACETOCHLOR APPLIED IN POST EMERGENCY ON THE WEEDS IN MAIZE
DOI: 10.7824/rbh.v4i1.16
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.
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