الفهرس 
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Abstract
The present study was carried out at the experimental farm of the city of scientific research and technological applications in Borg Al-Arab, Alexandria, Egypt. The site lies at 30° 53’N and 29° 32’E, with an elevation of about 28 meters above sea level from 2018-to 2019. The main objectives of this study are: 1. Understanding quinoa’s response to water stress during different growth stages. 2. Determine the water requirement of the crop under calcareous soil conditions. 3. Modeling water stress and water requirements of quinoa crops by using the AquaCrop model. Quinoa (chenopodium quinoa Willd) variety Chipaya was used as a test crop. The experiment was designed to investigate the effect of irrigation deficit levels at the rate of 40, 60, 80, and 100 % of the reference evapotranspiration (ET0) as compared with rainfed irrigation as a control. A completely randomized block design (RCBD) was the statistical design in this study. The sowing date was Nov. 11, 2018, and the harvesting was on Mar. 17, 2019. The growing season was 126 days. The texture of the soil was sandy clay loam. The seeds were sowed in a soil bed with 0.5 m width and 10.5 m length with 0.2 m between plants. The irrigation was done weekly using a drip irrigation system.