Comparing Simulated Jujube Evapotranspiration from P–T, Dual Kc, and S–W Models against Measurements Using a Large Weighing Lysimeter under Drip Irrigation in an Arid Area

Accurate prediction of orchard evapotranspiration (ET) can optimize water management. Based on the jujube (Zizyphus jujuba), ET was continuously measured from 2016 to 2019 using a large weighing lysimeter; actual compared with simulated Priestley–Taylor (P–T), Dual Crop Coefficient (Dual Kc), and Shuttleworth–Wallace (S–W) models, verify accuracy three models. The results showed that, 2019, whole growth period 532–592 mm crop coefficient 0.85–0.93. basal coefficients calibrated Kc model were 0.4, 1.0, 0.5 at initial, middle, ending stages, respectively. overall simulation error low, simulations stable during four years study. However, because rough estimation stress (Ks) will be reduced in case serious shortage. S–W greater than model, unstable vulnerable interannual changes. traditional P–T large. When parameter “α” solution method improved, significantly model’s only slightly lower that model. easily affected by changes net radiation air temperature. Therefore, is recommended for estimating young trees arid areas.