请用学术、通顺的英语翻译这段中文灌溉用水供应不足将不是例外灌溉管理将从强调单位面积产量转向最大限度地提高单位耗水产量即水生产率。为了应对稀缺的供应亏缺灌溉是实现减少灌溉用水目标的重要工具。亏缺灌溉的定义是施用低于作物全需水量蒸散量的水。尽管赤字灌溉在数百万公顷土地上广泛实施原因有很多从网络设计不足到相对于集水区供应的灌溉过度扩张但它在研究中没有得到足够的重视。

Insufficient irrigation water supply will not be an exception and irrigation management will shift from emphasizing unit area yield to maximizing unit water consumption, i.e., water productivity. In order to cope with scarce supply, deficit irrigation is an important tool to achieve the goal of reducing irrigation water use. Deficit irrigation is defined as the application of water below the crop's full water requirement (evapotranspiration). Although deficit irrigation is widely implemented on millions of hectares of land for various reasons, ranging from inadequate network design to irrigation over-expansion relative to the watershed supply, it has not received sufficient attention in research