2020 SPANISH JOURNAL OF AGRICULTURAL RESEARCH 2020 18(卷), 2(期), (null页)
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 (II), 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<0.2P/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