Evaluating AquaCrop Model for Predicting Soybean Yield and Water Productivity under Different Irrigation Regimes

  • سال انتشار: 1396
  • محل انتشار: هشتمین کنفرانس بین المللی کشاورزی پایدار در محیط زیست، غذا، انرژی و صنعت
  • کد COI اختصاصی: ICSAF08_038
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 632
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نویسندگان

Mahdi Sarai Tabrizi

Assistant Professor, Department of Water Engineering, Science and Research Branch, Islamic Azad University,Tehran, Iran;

Hossein Babazadeh

Associat Professor, Department of Water Engineering, Science and Research Branch, Islamic Azad University, Tehran,Iran;

Shiva Mohammadian Khorasani

PhD Student, Department of Soil Science, Science and Research Branch, Islamic Azad University, Tehran, Iran;

چکیده

Lack of water is a major restriction for the agricultural sector in arid and semi-arid regions. In such areas, an exact estimation of water productivity (WP) is an important task for planning. Among several simulation models, AquaCropcan be used to evaluate alternative water management practices in order to improve WP. The objective of this studywas to evaluate the performance of the model AquaCrop (v4.0) for the simulation of soybean yield and WP undersemi-arid conditions. A two-consecutive year field experiment with soybean was conducted in 2008 and 2009in Karaj, Iran. This experiment consisted of four furrow irrigation treatments including full irrigation (FI),conventional deficit irrigation (75 and 50 percent of the soil moisture deficit compensation) (DI75% and DI50%), andpartial root drying at 50 percent of the soil moisture deficit compensation (PRD50%). The results indicated thatAquaCrop could simulate crop evapotranspiration (ETc), WP and grain yield for soybean reasonably well for the FItreatment and the mild water stress treatment (DI75%). The performed sensitivity analysis indicated that mean deviation percentage of simulated grain yield, biological yield, WP and ETc for the partial root drying treatment in comparison with the FI treatment was more than about 94%, 92%, 91% and 87% respectively, indicating that AquaCrop cannot simulate these components at partial root drying treatment efficiently like other treatments at all. For better verification of the results, the use of a larger number of PRD treatments at different irrigation levels is suggested.

کلیدواژه ها

Crop evapotranspiration; Irrigation scheduling; Modeling; Water productivity

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