Revista Brasileira De Herbicidas 2013; 12(1): 23-30
Glyphosate and post emergence herbicides associations for controlling Commelina benghalensis on soybean RR®
This research aimed to evaluate the selectivity and efficacy of glyphosate tank mixture with different post- emergent herbicides on controlling Commelina benghalensis in soybean RR® crop. The experiment was conducted in field conditions using complete randomized block design, with four replications, where the treatments were four rates of cloransulam-methyl herbicide (10, 20, 30 and 40 g ha-1), four rates of chlorimuron-ethyl herbicide (2.5; 5.0; 7.5 and 10 g ha-1), imazethapyr at 100 g ha-1 and lactofen at 72 g ha-1, all in association with glyphosate herbicide at 960 g ha-1. It was also included three controls, characterized by an isolated rate of glyphosate at 960 g ha-1, a sequential application of glyphosate at 960/ 960 g ae.ha-1 besides a check without weeds handle control. The results obtained showed that only the unique application of glyphosate herbicide at 960 g ha-1 and its association with the lower rate of cloransulam-methyl (10 g ha-1) or chlorimuron-ethyl (2.5 g ha-1) did not promote effective C. benghalensis control. All chemical treatments did not influence soybean RR® yield, although the association of glyphosate and the higher rate of chlorimuron-ethyl (10 g ha-1) have promoted significant reduction in 1000 soybean grains weight.
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