Abstract
The objective was to evaluate the efficacy of the herbicide carfentrazone-ethyl in mixture with glyphosate, in the control of weeds in a no tillage system and to evaluate the tolerance of the cotton crop. The experiment was developed in the period from January to March of2001, in the FEP-UNESP in Selvíria, MS, in soil with a loamy texture. The cultivar of cotton used was 'ITA-90', with 0.90 m of spacing. The experimental design was randomized block with six treatments and four replicates. The treatments were the following: 2,4-D (670 g/ha), flumioxazin (25 g/ha) and carfentrazone-ethyl (20, 25 and 30 g/ha), all with glyphosate and mineral oil (0.5% v/v) and a weed free controI. The application was carried out with a manual pulverizer under constant pressure of 45 Ib/in? (CO), with a bar equipped with four fan type nozzles, spaced 0.5 m apart and spray volume of 250 Llha. The treatments carfentrazone-ethyl (20, 25 and 30 g/ha), 2,4-D (670 g/ha) and flumioxazin (25 g/ha), added to glyphosate (960 g/ha) + mineral oil Assist (0.5% v/v), applied before cotton plantation, were efficient for the control of Commelina benghalensis and Ipomoea nil for the weed control in a no tillage system and selective for cotton plants, for cultivate 'ITA-90' .
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