Supplemental irrigation management of rainfed grapevines under drought conditions using the CropSyst model

  • Maryam Khozaei Shiraz University, School of Agriculture, Dept. Water Engineering, 71946-84334 Shiraz
  • Ali A. Kamgar-Haghighi Shiraz University, School of Agriculture, Dept. Water Engineering, 71946-84334 Shiraz
  • Ali R. Sepaskhah Shiraz University, School of Agriculture, Dept. Water Engineering, 71946-84334 Shiraz Shiraz University, Drought Research Center, and Iran National Science Foundation (INSF), 71946-84334 Shiraz
  • Shahrokh Zand-Parsa Shiraz University, School of Agriculture, Dept. Water Engineering, 71946-84334 Shiraz
  • Fatemeh Razzaghi Shiraz University, School of Agriculture, Dept. Water Engineering, 71946-84334 Shiraz
  • Mohammad J. Karami Fars Agricultural and Natural Resources, Research and Education Center Seed and Plant Improvement, Research Dept., 7155863511 Shiraz
Keywords: simulated yield, finance analysis, land limiting conditions, optimum irrigation water, precipitation, semi-arid climate


Aim of study: To determine how much water should be used and when it should be applied in rain-fed grapevine using a cropping system simulation model (CropSyst), and also the economic analysis of supplemental irrigation for rainfed grapevine.

Area of study: This study was conducted at the School of Agriculture, Shiraz University, Shiraz, Iran, in 2012, 2013 and 2014.

Material and methods: The CropSyst model was calibrated to predict the rainfed yields of ‘Askari’ and ‘Yaghooti’ grapevines in different climates using four amounts of SI: 250 L (I1), 500 L (I2), 1000 L (I3) and 0 (I4), five SI times: single in March (T1), single in April (T2), single in March + single in April (T3), single in May (T4) and single in June (T5).

Main results: Treatment T3 increased the average simulated yield of ‘Askari’ by 15% to 40% at regions with P/ETo>0.6, 17% to 61% at 0.2<P/ETO<0.6, and 26% to 61% at P/ETO<0.2, while in ‘Yaghooti’ it increased about 2% to 41% at regions with P/ETo>0.6, 4% to 36% at 0.2<P/ETO<0.6 and 2% to 26% at P/ETO<0.2. By increasing the water price by 30% and 50%, net benefits for the ‘Askari’ decreased by about 31% and 54%, while 6% and 18%, for ‘Yaghooti’ respectively.

Research highlights: The CropSyst model can successfully predict soil water content and grapevine yields. Application of SI in May increased significantly the grapevine yield as compared to other SI times.


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How to Cite
KhozaeiM., Kamgar-HaghighiA. A., SepaskhahA. R., Zand-ParsaS., RazzaghiF., & KaramiM. J. (2020). Supplemental irrigation management of rainfed grapevines under drought conditions using the CropSyst model. Spanish Journal of Agricultural Research, 18(2), e1203.
Water management