Abstract
The objective of this study was to evaluate the real crop evapotranspiration and radish crop coefficient, “Crimson Gigante” cultivar, for different phenological stages under protected cultivation. The research was performed from March to April 2015 in pots arranged in greenhouse located at the Federal University of Campina Grande (UFCG). Dripping irrigation system was used for plants irrigation and the management was based on reference evapotranspiration (ET0). The water efficiency application of irrigation system (Ea), gross irrigation depth (LB), real crop evapotranspiration (ETr) and crop coefficient (kc) were determined during radish cycle cultivation. The results showed Ea = 89,30%, average daily LB of 4.31 mm, accumulated values of ETo and ETr of 175 and 150 mm. The maximum kc (0.94) was obtained in the intermediate phenological stage (III) and the minimum kc (0.58) occurred in the final stage (IV) with ETr of 75.4 and 14.5 mm, respectively. The crop coefficients were similar to those in the literature, except in the last growth plant stage. The increase in leaf area can be used as a parameter to estimate the water consumption of radish plants. Key words: Crimson Gigante, greenhouse, water consumption.  
Highlights
Radish (Raphanus sativus L.), an herbaceous plant belonging to Brassicaceae family, is a small vegetable which root is their comestible part
The research was performed from March to April 2015 in pots arranged in greenhouse located at the Federal University of Campina Grande (UFCG)
The increase in leaf area can be used as a parameter to estimate the water consumption of radish plants
Summary
Radish (Raphanus sativus L.), an herbaceous plant belonging to Brassicaceae family, is a small vegetable which root is their comestible part. This plant is characterized as being very sensitive to variations in soil moisture and in a situation of minimal scarcity or excess water, presents physiological disturbances that interfere with its productivity and commercial root diameter, especially due to cracks that results in tubercle (Filgueira, 2008). The evapotranspiration parameter means the simultaneous occurrence of soil water evaporation and plant transpiration process as function of energy balance, atmospheric demand and soil water supply to plants (Adorian et al, 2015)
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