The Crop Water Stress Index (CWSI) is a widely used method for quantifying crop water status and predicting yield. However, its evaluation across different irrigation methods and its stage‐specific response to crop yield is rarely evaluated. In this study, controlled field experiments were conducted on winter wheat using drip irrigation (DI) and flood irrigation (FI) during the 2021–2022 and 2022–2023 seasons in western Uttar Pradesh, India. The irrigation treatments included 50% MAD (maximum allowable depletion) (DI), 55% MAD (DI), 60% MAD (DI), 50% MAD (FI), local farmer's field replication (FI), rain‐fed, and well‐watered treatment (DI). The derived mean CWSI values for the irrigation treatments ranged from 0.03 to 0.66 in season 1 and 0.06 to 0.57 in season 2 across treatments. The seasonal mean CWSI for 50% MAD (DI) was 0.12 (season 1) and 0.11 (season 2), while 50% MAD (FI) yielded higher mean CWSI values of 0.29 (season 1) and 0.22 (season 2). The 50% MAD (DI) treatment produced the highest grain yield and water use efficiency in both seasons. A comprehensive analysis of stage‐specific CWSI values and grain yields revealed that grain yield was more sensitive to post‐heading CWSI as compared to pre‐heading CWSI values. Among the growth stages, CWSI values during the flowering stage were the most critical for predicting wheat yield. The study recommends that the CWSI values in the flowering and post‐heading stages are more relevant in predicting wheat yield accurately as compared to the pre‐heading and seasonal mean CWSI.

中文翻译：

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在不同滴灌和漫灌处理下种植的冬小麦 （Triticum aestivum） 作物的作物水分胁迫指数和产量关系


作物水分胁迫指数 （CWSI） 是一种广泛使用的方法，用于量化作物水分状况和预测产量。然而，它在不同灌溉方法中的评估及其对作物产量的特定阶段反应很少被评估。在这项研究中，在印度北方邦西部的 2021-2022 和 2022-2023 季节使用滴灌 （DI） 和漫灌 （FI） 对冬小麦进行了对照田间试验。灌溉处理包括 50% MAD（最大允许消耗）（DI）、55% MAD （DI）、60% MAD （DI）、50% MAD （FI）、当地农民田间复制 （FI）、雨养和浇水充足的处理 （DI）。各处理中灌溉处理的得出的平均 CWSI 值在第 1 季为 0.03 至 0.66，第 2 季为 0.06 至 0.57。50% MAD （DI） 的季节性平均 CWSI 为 0.12（第 1 季）和 0.11（第 2 季），而 50% MAD （FI） 产生的平均 CWSI 值为 0.29（第 1 季）和 0.22（第 2 季）。50% MAD （DI） 处理在两个季节中产生了最高的谷物产量和水分利用效率。对特定阶段 CWSI 值和谷物产量的综合分析表明，与抽穗前 CWSI 值相比，谷物产量对抽穗后 CWSI 更敏感。在生育阶段中，开花期的 CWSI 值对预测小麦产量最为关键。该研究表明，与抽穗前和季节性平均 CWSI 相比，开花和抽穗后阶段的 CWSI 值在准确预测小麦产量方面更相关。