EVALUATION OF THE AQUACROP MODEL PERFORMANCE AND THE IMPACT OF FUTURE CLIMATE CHANGES ON POTATO PRODUCTION UNDER DIFFERENT SOIL MANAGEMENT SYSTEMS

This study was aimed to investigate the effect of surface sprinkler and drip irrigation systems using a model AquaCrop, intervals, bio-organic fertilizers polymers in desert soils. Two field experiments were conducted during spring season 2020 at Karbala governorate. The experiment included three factors: 1-Irrigation system T1 T2, 2- Irrigation interval: every 2 days I1, 4 I2 6 I3, 3- Addition soil conditioners: control without any addition C, (seek) B, polymer (zeba) P, polymer+ P+B. designed according nested design with replicates results regional climate models AquaCrop model. showed that there an increase amount annual precipitation seasonal periods (2016-2035) (2046-2065) under RCP4.5 scenario, compared base period (1985-2005). With scenario RCP8.5 slight decrease period. Moreover, maximum minimum temperatures expected productivity as R2 0.85 0.81 for twelve years, sprinkler, respectively. correlation coefficient (r) 0.95 0.90, root means square error (RMSE) 2.43 2.19, efficiency 0.66 0.42 systems, Finally, water treatment BP interval I1and C I3 when comparing For sprinkler.