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Abstract
As one of the leading pecan regions, the Southeast corpus of research on water use of pecan trees is scarce. Much of the knowledge of water requirements stems largely from flood irrigated dry and arid Southwest. This paper discusses the behavior of the crop coefficient throughout the different physiological stages of the tree from budbreak to harvest in a southeastern micro-sprinkler irrigated orchard. Results of the real time crop coefficient obtained throughout the season differs from the Southwest where the actual evapotranspiration during the growing season is significantly higher than the one observed in the Southeast. The daily crop coefficient throughout the growing period from 2019 through 2023 varies from 0.4 to 1.0 with highest in July. There is no significant difference between seven-year-old and ten-year-old pecan trees. These results are fundamental for the irrigation scheduling in hot and humid climate.