Many research papers on crop water requirements of vegetables have been produced since the publication of the FAO56 guidelines in 1998. A review of this literature has shown that determination of crop evapotranspiration (ET${}_{\mathrm{c}}$) using the ${\mathrm{K}}_{\mathrm{c}}$-ET${}_{\mathrm{o}}$ approach, i.e., the product of the specific crop coefficient (${\mathrm{K}}_{\mathrm{c}}$) by the reference evapotranspiration (ET${}_{\mathrm{o}}$), is the most widely-used method for irrigation water management. Consequently, a review was made to provide updated information on the ${\mathrm{K}}_{\mathrm{c}}$ values for these crops. The reviewed research provided various approaches to determine ${\mathrm{K}}_{\mathrm{c}}$ in its single and dual versions. With this purpose, actual crop ET (ET${}_{\mathrm{c act}}$) was determined with lysimeters, or by performing the soil water balance using measured soil water content and computational models, or by using Bowen ratio energy balance and eddy covariance measurements, or by using remote sensing applications. When determining the basal ${\mathrm{K}}_{\mathrm{c}}$ (${\mathrm{K}}_{\mathrm{cb}}$), the partitioning of ET${}_{\mathrm{c act}}$ was evaluated using different approaches, though mainly using the FAO56 dual ${\mathrm{K}}_{\mathrm{c}}$ method. Since the accuracy of experimentally-determined ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ values depends upon the procedure used to compute ET${}_{\mathrm{o}}$, as well as accuracy in determining and partitioning of ET${}_{\mathrm{c act}}$, the adequacy of the measurement requirements for each approach was carefully reviewed. The article discusses in detail the conceptual methodology relative to crop coefficients and the requirements for transferability, namely distinguishing between actual and standard ${\mathrm{K}}_{\mathrm{c}}$ and the need to appropriately use the FAO segmented ${\mathrm{K}}_{\mathrm{c}}$ curve. Hence, the research papers selected to update and consolidate mid-season and end-season standard ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ were those that computed ET${}_{\mathrm{o}}$ with the FAO56 PM-ET${}_{\mathrm{o}}$ equation; and that also used accurate approaches to determine and partition ET${}_{\mathrm{c act}}$ for pristine, non-stressed cropping conditions. Under these experimental conditions, the reported ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ values relative to the mid- and end-season could be considered as transferable standard ${\mathrm{K}}_{\mathrm{c}}$ and/or ${\mathrm{K}}_{\mathrm{cb}}$ values after adjustment to the standard climate adopted in FAO56, where average RH${}_{\min }$ = 45% and average u${}_2=2$ m s⁻¹ over the mid-season and late season growth stages. For each vegetable crop, these standard values were then compared with the FAO56 tabulated ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ values to define the updated values tabulated in the current article. In addition, reported ancillary data, such as maximum root zone depth, maximum crop height, and soil water depletion fraction for no water stress, were also collected from selected papers and tabulated in comparison with those given for the crops in FAO56. The presentation of updated crop coefficient results is performed by grouping the vegetables differently than in FAO56, where distinction is made according to their edible parts: (1) roots, tubers, bulbs and stem vegetables; (2) leaves and flowers vegetables; (3) fruit and pod vegetables; and (4) herbs, spices and special crops, with most of them being newly introduced herein. The updated ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ of vegetable crops based on this review are generally coincident with those in FAO56, although slightly lower for several crops. Close agreement of selected paper values with FAO56 values provides good evidence of their quality and also confirms the reliability of the original FAO56 tabulated values. It is noteworthy that many papers surveyed from the past 20 years did not satisfy the adopted ${\mathrm{K}}_{\mathrm{c}}$ requirements in terms of ET${}_{\mathrm{o}}$ computation method nor provide solid evidence of measurement accuracy for ET${}_{\mathrm{c act}}$. It is recommended that future ${\mathrm{K}}_{\mathrm{c}}$ research of vegetables should sufficiently address these issues with objectives broadened to provide more transferable data to other regions. Also, new data on vegetable ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{cb}}$ values should be carefully scrutinized in the context of these results and those provided in FAO56.

自1998年FAO56准则发布以来，已针对蔬菜的作物需水量发表了许多研究论文。对该文献的回顾表明，确定作物的蒸散量（ET${}_{\mathrm{C}}$） 使用 ${\mathrm{ķ}}_{\mathrm{C}}$-ET${}_{\mathrm{Ø}}$方法，即特定作物系数的乘积（${\mathrm{ķ}}_{\mathrm{C}}$）由参考蒸散量（ET${}_{\mathrm{Ø}}$），是灌溉用水管理中使用最广泛的方法。因此，进行了审查以提供有关${\mathrm{ķ}}_{\mathrm{C}}$这些作物的价值。审查的研究提供了各种方法来确定${\mathrm{ķ}}_{\mathrm{C}}$在其单一和双重版本中。为此目的，实际农作物ET（ET${}_{\mathrm{行为}}$）可以通过测渗仪，通过使用测得的土壤水分含量和计算模型进行土壤水分平衡，或者通过Bowen比能量平衡和涡旋协方差测量，或者通过遥感应用来确定。确定基础时${\mathrm{ķ}}_{\mathrm{C}}$ （${\mathrm{ķ}}_{\mathrm{b}}$），ET的分区${}_{\mathrm{行为}}$ 尽管主要使用FAO56双重标准进行了评估 ${\mathrm{ķ}}_{\mathrm{C}}$方法。由于精度由实验确定${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$ 值取决于用于计算ET的过程${}_{\mathrm{Ø}}$以及确定和划分ET的准确性${}_{\mathrm{行为}}$，仔细评估了每种方法的测量要求是否足够。本文详细讨论了与作物系数有关的概念方法和对可转移性的要求，即区分实际和标准${\mathrm{ķ}}_{\mathrm{C}}$ 以及适当使用粮农组织细分市场的需要 ${\mathrm{ķ}}_{\mathrm{C}}$曲线。因此，研究论文选择了更新和巩固季中和季末标准${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$ 是那些计算ET的${}_{\mathrm{Ø}}$ 与FAO56 PM-ET${}_{\mathrm{Ø}}$方程; 而且还使用了准确的方法来确定和划分ET${}_{\mathrm{行为}}$适用于原始，无压力的种植条件。在这些实验条件下，${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$ 相对于赛季中期和赛季末的值可以视为可转让标准 ${\mathrm{ķ}}_{\mathrm{C}}$ 和/或 ${\mathrm{ķ}}_{\mathrm{b}}$ 调整为粮农组织56采用的标准气候后的值，其中平均相对湿度${}_{\mathrm{分}}$ = 45％，平均u${}_2=2$在中期和后期生长阶段的m s ^-1。然后将每种蔬菜作物的这些标准值与列表中的FAO56进行比较${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$值以定义当前文章中列出的更新值。此外，还从选定的论文中收集了已报告的辅助数据，例如最大的根区深度，最大的作物高度和无水分胁迫下的土壤水分消耗分数，并与粮农组织56中针对作物的数据进行了比较。更新的作物系数结果的表述是通过将蔬菜与粮农组织56不同的方式进行分组的，其中根据其可食用部分进行区分：（1）根，块茎，鳞茎和茎类蔬菜；（2）叶子和花朵蔬菜；（3）水果和豆荚蔬菜；（4）草药，香料和特殊农作物，其中大多数是新引入的。更新的${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$根据这次审查，蔬菜作物的收成总体上与粮农组织56相吻合，尽管几种作物的收成略低。所选纸张值与FAO56值的紧密一致性为它们的质量提供了很好的证据，也证实了原始FAO56表格值的可靠性。值得注意的是，过去20年中接受调查的许多论文都不满足于采用${\mathrm{ķ}}_{\mathrm{C}}$ ET方面的要求${}_{\mathrm{Ø}}$ 计算方法，也不能为ET的测量准确性提供可靠的证据${}_{\mathrm{行为}}$。建议将来${\mathrm{ķ}}_{\mathrm{C}}$蔬菜研究应充分解决这些问题，其目标应扩大到向其他地区提供更多可转移的数据。此外，有关蔬菜的新数据${\mathrm{ķ}}_{\mathrm{C}}$ 和 ${\mathrm{ķ}}_{\mathrm{b}}$ 应根据这些结果以及粮农组织提供的那些值仔细检查这些值56。