A field experiment was conducted over two successive seasons of 2017 and 2018 in Egypt. The aim was to study the effect of irrigation systems (surface and subsurface drip irrigation) and irrigation amounts (100%, 80%, and 60% of crop evapotranspiration, ETc) on the yield of bean crop (Phaseolus vulgaris) and evaluate the SALTMED model performance on simulation of soil moisture, total dry matter, and yield. Despite the highest yield values being achieved with the 100% of ETc treatment, there were no significant differences between the 100% and 80%. This means a water saving of 20% can be achieved without significantly compromising the yield. Yield and water productivity under subsurface irrigation was slightly higher than under surface drip irrigation. This is because under subsurface drip irrigation, there is no wetted surface area contributing to evaporation losses as is the case for surface drip. In addition, the soil moisture under subsurface drip is kept within the root zone for the longest possible time without subjecting the crop to water stress. The SALTMED model accurately simulated soil moisture, total dry matter, yield, and water productivity. Hence, the model could be applied as crop, water, and land management tool under current and future Egyptian climatic conditions.

中文翻译：

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在亏缺滴灌条件下提高豆类的节水，增产和产水量：使用SALTMED模型的田间研究和模型研究*

在埃及的2017年和2018年连续两个季节进行了实地试验。目的是研究灌溉系统（地面和地下滴灌）和灌溉量（作物蒸散量（ETc）的100％，80％和60％）对豆类作物（菜豆）的影响并评估SALTMED模型在模拟土壤水分，总干物质和产量方面的性能。尽管使用100％的ETc处理可获得最高的产量，但100％和80％之间没有显着差异。这意味着可以在不显着影响产量的情况下节水20％。地下灌溉的产量和水分生产率略高于地下滴灌的产量和水分生产率。这是因为在地下滴灌条件下，没有湿润的表面积会导致蒸发损失，这与地面滴灌的情况一样。此外，地下滴灌下的土壤水分会在根系区域内保持尽可能长的时间，而不会使作物遭受水分胁迫。SALTMED模型可精确模拟土壤湿度，总干物质，产量，和水生产率。因此，该模型可以用作当前和未来埃及气候条件下的作物，水和土地管理工具。