2025-10-012025-10-012022-02-16https://repositorio.ifal.edu.br/handle/123456789/1261Irrigation in agriculture allows conditions for genetic material to express its full production potential in the field, but scientific studies are needed to optimize the use of water in regions of difficult access to it, such as semi-arid regions. Therefore, the present study aimed to determine the economic irrigation depth for cowpea cultivation in the Sertão Alagoano region.A creole variety commonly cultivated by farmers in the region was used, which was subjected to five irrigation depths (30, 60, 90, 120 and 150% of crop evapotranspiration-ETc). The experiment was developed at the Federal Institute of Alagoas/Campus Piranhas, during the months of February to May 2018. The culture was irrigated by drip, in which irrigation costs plus planting costs and cultural treatments were used to determine the economic level of water, through the analysis of grain productivity. Yield differed statistically between the slides applied, according to the F test (p<0.05). The culture of cowpea of creole genetic nature has a low response to irrigation, in which the economic depth is independent of the selling price of the grain and is close to the depth that provides maximum physical yield.ptGotejamentoVigna unguiculataReceita LíquidaDripNet income.Trabalho de Conclusão de CursoCIENCIAS AGRARIAS