Abstract

The model was used to simulate tomato green canopy (CC), soil water (SWC) and final yield under deficit irrigation regimes as 1.25, 1.00, 0.75 and 0.50 percentages of crop evapotranspiration (ET_c). The model was calibrated by used an experimental data and fine-tune to some conservative crop parameters. The NRMSEs in simulated CC and SWC in different treatments were 4.1–19.6 and 6.3–14.1%, respectively, that corresponds to overall averages of 0.92 and 0.84 for R² in CC and SWC. In exception to severe water stress treatments, the model showed overestimation trend on biomass and yield, and proved satisfactory performance. The maximum simulated biomass and yield was 12.88 and 6.04 t/ha, respectively. The lower values in yield and biomass belong to less water applied treatments, that shows the model accuracy declines in high water deficiency. Simulated biomass WUEs varied from 2.26 to 3.73 kg/m³, likewise the yield WUEs varied from 1.06 to 1.71 kg/m³. The higher WUEs obtained in less water applied treatments, obviously, the WUE increases when applications of water decreased. The findings of water saving potential (WSP), recommended 0.75 of ET_c to saved 25.09% of water with only 12.00 and 15.52% reduction in measured and simulated yield.

中文翻译：

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亏缺灌溉策略下利用FAO-AquaCrop模型模拟冠层覆盖，土壤水分和产量

摘要

该模型用于模拟在亏水灌溉条件下的作物蒸发蒸腾量（ET _c）为1.25％，1.00％，0.75％和0.50％的番茄绿冠层（CC），土壤水（SWC）和最终产量。通过使用实验数据对模型进行校准，并对一些保守的作物参数进行微调。模拟CC和SWC在不同处理中的NRMSE分别为4.1–19.6和6.3–14.1％，对应于R ^2的总体平均值0.92和0.84在CC和SWC中。除严重的水分胁迫处理外，该模型对生物量和产量均显示出高估趋势，并证明其性能令人满意。最大模拟生物量和产量分别为12.88和6.04 t / ha。较低的产量和生物量值属于较少的水处理，这表明高缺水时模型精度下降。模拟的生物量WUE在2.26至3.73 kg / m ³之间变化，同样，产量WUE在1.06至1.71 kg / m ^{3之间变化}。在较少的水处理中得到的WUE越高，显然，当水的施用量减少时，WUE会增加。节水潜力（WSP）的研究结果，建议0.75 ET的_Ç 节省了25.09％的水，而实测和模拟的产量仅减少了12.00和15.52％。