This research entitled "Effects of the herbicide dose (Quizalofop -P- Tefurylo) in the post-emergent weed control on the yield of cowpea in the Huallaga Province Cantarcillo sector (Vigna unguiculata L. Walp.) - Saposoa "was carried out in arder to assess and determine the effect of different doses of Quizalofop-P-tefurylo herbicide for post emergence weed control in the crop yield of cowpea sp. Statistical randomized complete block design with tour treatments and three replications. The treatments were TO (control), T1 (1,0 l.ha-1), T2 (0,75 l.ha -1) and T4 (0,5 l.ha-1). The results indicate. that: treatment ·T2~ (Quizalofop-f>"''~'tefurylo 1',ü l.ha-1)· readled· the highest average performance with 678,86 kg ha-1 statistically outperforming all other treatments, followed by treatments T3 (Quizalofop-P- tefurylo 0,75 l.ha-1), T1 (Control weeding manual) and T 4 (Quizalofop -P- tefur...