Tolerance of cowpea cultivars to pre-emergence application of sulfentrazone

Improved methods of weed control are required to support expansion large-scale cowpea cultivation in mid-west Brazil. With the aim testing our hypothesis that tolerance cultivars sulfentrazone is dose- and genotype-dependent, we assessed effects increasing doses (0, 250, 500 1,000 g ha-1 sulfentrazone) on BRS Imponente, Novaera, Tumucumaque Itaim. The phytotoxic varied according dose herbicide applied, although symptoms were mild only observable at initial stages development highest tested. No statistically significant interactions detected between doses, there no differences regarding population density, plant height, yield components grain yield. Our results demonstrate highly selective can be applied studied without affecting growth or