2026-02-252026-02-252022-02-23https://repositorio.ifal.edu.br/handle/123456789/1412This study aimed to evaluate the effect of water stress on the chlorophyll content of corn and to determine the economic irrigation depth for the crop in the Sertão Alagoano region. For this, the hybrid AG7088 was submitted to five irrigation depths (40, 80, 120, 160 and 200% of the ETc) in an experiment carried out at Instituto Federal de Alagoas/Campus Piranhas, with an experimental design in a band scheme and four replications. Three values of price per bag of corn were used to estimate the maximum economic efficiency depth (Xec). Harvest was carried out at 98 DAS, in which grain yield with 12% moisture reached 2,0527 and 11,833 kg ha-1 and water use efficiency of 128.5 and 45 mm t-1 in treatments with 40 and 160% of ETc, respectively. The maximum physical productivity (Ymax) estimated by the production function was 11,267 kg ha-1 , obtained with 919.2 mm of irrigation water. The maximum economic yields (Yec) for the price of a bag of corn equal to R$ 50.00; 80.00 and 110.00 were equal to 10,971, 11,225 and 11,251 kg ha-1 , obtained with water depths of 790.7 (143,6% of ETc), 871 (158,2% of ETc) and 889,5 mm (161,8% of ETc), respectively. The economic blade was 525, 326 and 262 mm, respectively, for the quoted quotation scenarios. The IFC has a direct relationship with the water supply provided, in which the increase in the water supply provides an increase in chlorophyll in the plants up to a certain limit, reducing with the excess of water applied.ptPigmento fotossintetizantesLâminas de águaIncremento agrícolaPhotosynthetic pigmentWater depthsAgricultural incrementeTrabalho de Conclusão de CursoCIENCIAS AGRARIAS