In areas where water is scarce, the use of regulated deficit irrigation, combined with decision support system tools, may decrease the impact of agriculture on natural water resources, as well as on energy consumption, thereby improving the profitability of farms. With this aim, the SUBSTOR-Potato model (incorporated in the DSSAT Program) was evaluated with a 2-year field test (2011 and 2012) conducted in a semi-arid area (Albacete, Spain) applying four irrigation levels (120, 100, 80 and 60% of irrigation requirements). Subsequently, the model was used for simulating the potato yield under several deficit irrigation strategies (ISs) during 30 years of a semi-arid climate (1988–2017) and determining the most profitable option. The considered ISs were deemed those most suitable from the yield and water productivity point of view by some authors. The model performance for tuber yield was satisfactory with an index of agreement >0.91 and errors between 0.71 and 3.06 × 103 kg/ha. The ISs simulated with SUBSTOR-Potato showed that slight deficit irrigation (5–10%) may increase the water productivity and profitability of the farms. Moreover, tuber formation (from onset of tuber initiation to harvest) was shown to be the most sensitive stage, therefore it is highly recommended to avoid deficit during this stage, which would cause a large reduction in yield (around 8 t/ha, depending on the level of deficit suffered by the crop).

中文翻译：

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基于SUBSTOR-Potato模型的半干旱地区亏缺灌溉策略分析

在水资源稀缺的地区，使用有调节的赤字灌溉，结合决策支持系统工具，可以减少农业对天然水资源和能源消耗的影响，从而提高农场的盈利能力。为此，SUBSTOR-Potato 模型（纳入 DSSAT 计划）通过在半干旱地区（西班牙阿尔巴塞特）进行的为期 2 年的现场测试（2011 年和 2012 年）进行了评估，应用了四个灌溉水平（120、100 , 80% 和 60% 的灌溉需求）。随后，该模型被用于模拟 30 年半干旱气候（1988-2017 年）期间几种亏缺灌溉策略（IS）下的马铃薯产量，并确定最有利可图的选择。一些作者认为从产量和水分生产率的角度来看，所考虑的 IS 是最合适的。3公斤/公顷。用 SUBSTOR-Potato 模拟的 IS 表明，轻微的缺水灌溉 (5-10%) 可能会提高农场的水生产力和盈利能力。此外，块茎形成（从块茎开始到收获）被证明是最敏感的阶段，因此强烈建议在此阶段避免赤字，这将导致产量大幅下降（约 8 吨/公顷，取决于作物遭受的赤字水平）。