Potato Irrigation Planning based on Moisture depletion using AquaCrop

Subject Areas :

Mohammad Ali Ansari ¹ , Aslan Egdernezhad ² , Niazali Ebrahimipak ³

1 - M.Sc. Student of Irrigation and drainage, Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
2 - Assistant Professor, Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
3 - Associated professor, Department of irrigation and soil physics, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

Received: 2019-01-04 Accepted : 2019-04-18 Published : 2018-11-22

Keywords: biomass, water use efficiency, Deficit Irrigation Scenarios, Cropping Models,

Abstract :

In order to potato irrigation planning based on moisture depletion, calibrated AquaCrop was used. This model was calibrated using data collected from a research station in Chahartakhteh, Shahrekord, in two years. Then, Aquacrop was implemented under multi run in different depletion and irrigation scenarios (DyIx; which y indicates depletion amount and x indicates irrigation amount in mm). Results revealed that there was no water stress under 40 mm depletion and 40 mm irrigation. Crop yield and biomass was so low when depletion was more than 80 mm. In order to apply deficit irrigation, depletion must be between 40 to 70 mm. Based on the results, maximum yield was observed for D40I40 (22.6 ton.ha-1) and minimum yield was observed for D70I20 (10.8 ton.ha-1). In the case of water deficit, D60I40, D60I30, and D65I30 were the best scenarios so that the yields for mentioned scenarios were 16.8, 22.2, and 27 percent less than D40I40 yield. Biomass values for mentioned scenarios were 16.6, 21.8, and 26.7 percent less than D40I40 biomass. Water use efficiency for this scenarios were 0.7 (more), 0.7 (less), and 1.9 (less) than D40I40 one. So, D40I40 and D60I40 were the best scenario in full and deficit irrigation, respectively.