Eficácia e seletividade de herbicidas para o manejo de plantas daninhas em cevada

Abstract

Ryegrass is the main weed that infests barley, causing high losses in productivity and quality of grain. Thus, we intended to work, to evaluate the selectivity and efficacy of herbicides for weed control in barley. For such an experiment, the field in a random-ized block in factorial scheme 2 x 12, with four replications was installed. A factor in the genotypes barley were assigned MN610 and Crioula and B herbicides (iodosulfuron imazethapyr + imazapic; clomazone; propanil; oxyfluorfen; metsulfuron; 2,4-D; cyhalofop; Penoxsulam; were allocated pyroxsulam, weeded and infested). The MN610 genotype showed high sensitivity to clomazone and imazethapyr + imazapic, with its components of grain yield reduced in the presence of these prod-ucts. Have genotype Crioula, presented a more tolerant iodosulfuron, propanil, pyroxsulam, imazethapyr + imazapic, clomazone and oxyfluorfen because the prod-ucts are less negatively affected yield components of two genotypes of barley. The herbicides may cause, depending on the genotype, reduction in yield components of culture, which consequently affect the grain yield of barley. The herbicide that had the best response was iodosulfuron, keeping the crop free of weeds and combined with a lower phytotoxicity culture. The herbicide that had the best response was iodosulfuron, keeping the crop free of weeds and combined with a lower phytotoxicity culture.