Estimation of Greenhouse-Grown Eggplant Evapotranspiration Based on a Crop Coefficient Model

Accurate estimation of crop evapotranspiration (ETc) is important to determine water requirements in greenhouse agriculture and improve the irrigation use efficiency. Here, a 3-year (2017–2019) experiment with spring greenhouse-grown eggplant (Solanum melongena L.) was conducted investigate variation coefficient (Kc) measured weighing lysimeter, adjust Kc based on local climate (Kc,Adj), estimate daily ETc using model. The 3-years mean (Kc,Loc) were 0.23 ± 0.03, 0.62 0.06, 1.05 0.03 0.87 at initial, development, mid-season, end-season stages, respectively. Significant linear correlation observed between Kc,Adj Kc,Loc 3 years (R2 = 0.873, 0.901, 0.897 2017–2019, respectively). Compared FAO-56 recommended value (Kc,FAO), by 66.3% 61.8% lower, single model accurately estimated for eggplant. determination (R2), absolute error (MAE), root-mean-squared (RMSE), index agreement that 0.94, 0.35 mm?d?1, 0.26 0.98, respectively, means 2018 2019. Therefore, method reliably adjustment actual environment can serve as useful tool