Revista Brasileira De Herbicidas 2001; 2(1-2): 65-71
Efficacy of herbicides in the control of weeds in no-till corn
The experiment was conducted in 1999/00, in the FEP-FEIS-UNESP, Selvíria-MS, in soil with a loamy texture. The objective was to evaluate the efficacy ofthe herbicide carfentrazone-ethyl in mixture with glyphosate, for the control ofweeds in a no tillage system, and to evaluate the tolerance ofthe crop. The com used was ‘CO-32’. The experimental design was a randomized block with seven treatments and four replications. The chemical treatments were the following: 2,4-0 (670 g/ ha), flumioxazin (25 g/ha) and carfentrazone-ethyl (15, 20, 25 and 30 g/ha). In ali treatments glyphosate (720 g/ha acid equivalent) and mineral oil Assist at 0,5% v/v was added. A treatment with no weed control was also included. The efficacy ofthe treatments was evaluated on the weed control and crop yield. It was observed that the treatments are highly selective for the com crop. The treatment with the carfentazone-ethyl, at 20, 25 and 30 g/ha, is efficient for the control of Commelina benghalensis and Bidens pilosa. At 15 g/ha, carfentrazone contrais B. pilosa. The treatment with 2,4-0 is efficient in the control of C. benghalensis and B. pilosa. The treatment with flumioxazin is efficient in the contrai of B. pilosa. It was also observed that weed interference reduced the com yield in 96%, in relation to the average of the treatments with chemical control.
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