ABSTRACT
Knowledge of evapotranspiration (ET) is essential for efficient agricultural water management. Efficient use of water for agricultural production has become a moral and ethical issue, considering such factors as increasing global population, dwindling water supplies, widespread degraded water quality, climate variability, and 70% of all water withdrawn is used for agriculture, and most of this is used for irrigation [22, 53]. The purpose of this chapter is to summarize recent ET studies
conducted in Puerto Rico. Each of these studies has had at its core, the goal of more accurately estimating crop water requirements and increasing water use efficiency.
