cavalcante_jr_et_al._august_2016.pdf
, 0.78, 1.09 and 0.52 for the stages I, II, III and IV, respectively. For the conditions of the Gurgueia Valley, PI, Bastos et al. (2008) obtained Kc values of irrigated cowpea superior to those of the present study. The mean crop coefficient for the initial stage was 0.8; for vegetative growth