Deficit irrigation is a water conserving practice that involves watering below an estimated evapotranspiration (ET) replacement level. Research is limited to comparing cool‐season (CS) and warm‐season (WS) turfgrass varieties grown in arid regions under varying deficit irrigation replacement levels. This study investigated the effects of five levels of reference evapotranspiration for short grass (ETOS) replacement (55%, 70%, 85%, 100%, and 115%) on the performance and fall recovery of several turfgrasses in the southwestern United States. Three years of field research evaluated green cover and visual quality of three CS Kentucky bluegrass (Poa pratensis L.) (four cultivars), tall fescue [Schedonorus arundinaceus (Schreb.)] (three cultivars), and perennial ryegrass (Lolium perenne L.) (three cultivars), and two WS turfgrasses bermudagrass (Cynodon dactylon L.) (three cultivars) and buffalograss Buchloe dactyloides (two cultivars). CS grasses required higher ETOS replacement than WS grasses to maintain acceptable quality (1–9, ≥6 = minimum acceptable) and coverage. Among CS grasses, Barserati Kentucky bluegrass maintained the best quality and green cover under deficit irrigation and demonstrated the most consistent ability to recover. Notably, bermudagrass performed well under deficit irrigation, maintaining acceptable visual quality and better green cover than CS species like Kentucky bluegrass and tall fescue at lower irrigation levels. Overall, there were significant differences among cultivars, demonstrating the importance of the selection process in drought tolerance. These findings support the promotion of drought‐resistant WS grasses to conserve water in arid regions without compromising turfgrass functionality. Future research should focus on variable and seasonal ETOS for irrigation of turfgrasses and estimating irrigation requirements.

中文翻译：

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不同作物系数灌溉的草坪草的性能和恢复


亏缺灌溉是一种节水做法，涉及在估计的蒸散 （ET） 替代水平以下浇水。研究仅限于比较在不同缺损灌溉替代水平下在干旱地区种植的冷季 （CS） 和暖季 （WS） 草坪草品种。本研究调查了短草 （ETOS） 替代的五个参考蒸散量水平（55%、70%、85%、100% 和 115%）对美国西南部几种草坪草的性能和跌落恢复的影响。三年的实地研究评估了三种 CS 肯塔基蓝草 （Poa pratensis L.） 的绿色覆盖率和视觉质量。（四个栽培品种），高羊茅 [Schedonorus arundinaceus （Schreb.）]（三个栽培品种）和多年生黑麦草 （Lolium perenne L.）（三个栽培品种）和两个 WS 草坪草百慕大草 （Cynodon dactylon L.）（三个栽培品种）和水牛草 Buchloe dactyloides（两个栽培品种）。CS 草比 WS 草需要更高的 ETOS 更换，以保持可接受的质量（1-9，≥6 = 最低可接受）和覆盖率。在 CS 草中，Barserati Kentucky 蓝草在亏缺灌溉下保持了最好的质量和绿色覆盖率，并表现出最一致的恢复能力。值得注意的是，百慕大草在亏缺灌溉下表现良好，与灌溉水平较低的肯塔基蓝草和高羊茅等 CS 物种相比，保持了可接受的视觉质量和更好的绿色覆盖率。总体而言，品种之间存在显着差异，证明了选择过程在耐旱性中的重要性。这些发现支持推广抗旱 WS 草，以在干旱地区节水，而不会影响草坪草的功能。 未来的研究应侧重于用于草坪草灌溉的可变和季节性 ETOS 并估计灌溉需求。