Revista Brasileira De Herbicidas 2000; 1(2): 167-172
Efficacy of desiccant herbicides in no-till soybean
DOI: 10.7824/rbh.v1i2.332
This research was done to evaluate the tolerance and efficacy ofpostemergence herbicides to contrai established weeds in no-ti 11soybean. Experiment was conducted at Rondonópolis, Mato Grosso, from 1999 to 2000, in the Sementes Maggi 2 Farm, on a loamy texture soil, using Emgopa 313 variety. Planting was done in an are a with adult weeds, in the system of “direct planting on the weeds”. Herbicides were applied in postemergence ofthe weeds and the culture. Experimental design was a randomized complete block with seven treatments and four replications. The treatments were as follow: glyphosate (960 and 1920 g/ha), chlorimuron-ethyl+glyphosate (10+960 and 20+960 g/ha), chlorimuron-ethyl+glyphosate+flumioxazin (20+960+40 gI ha), glyphosate+ 2,4-D (960+868 g/ha) and untreated check plot. Efficacy ofherbicides was evaluated in the base of controlling adult weeds and the residual effect of the treatments. No injury on soybean was caused by any treatment. Weeds found in the experimental area were: Commelina benghalensis, Cenchrus echinatus and Bidens pilosa. Ali treatments were efficient in the contrai of the studied weeds, except for glyphosate isolated, in C. benghalensis. Chlorimuron-ethyl (10 and 20 g/ha) applied together with glyphosate, provided a significant residual effect for Bidens pilosa, reducing the occurrence ofthe weed during the entire soybean cycle. .
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