The gradual depletion of irrigation water is a major threat to the agricultural economy in the arid and semi-arid regions of the world. Drought–tolerant crops and improved irrigation management practices may help the sustainability of agriculture in the region. A three–year field experiment (2018–2020) was conducted to assess the effects of pre–and in–season irrigations on the physiology, biomass production, yield, and yield components of two diverse guar () cultivars. A split-split plot design was used, where the main plot was pre–irrigation, subplots consisted of in–season irrigation treatments, and sub-sub plots were cultivars. Each treatment was replicated four times each year. Pre–irrigation improved the averaged final seed yield by 32% compared to plots with no pre–irrigation. Seed yield was significantly affected by in–season growth stage based irrigation treatments. Averaged over the years, full irrigation achieved the highest seed yield, although not significantly different from no irrigation during the vegetative growth stage in any study year. Cultivar Kinman performed better than Monument in biomass production and seed yield. Overall, pre–irrigation improves guar growth and development, leading to greater seed yield and biomass production. The most sustainable strategy to utilize the available water resources will be to grow guar with restricted irrigation during the vegetative growth stage, save 22% of water, and maintain a similar seed yield to plots that received irrigation throughout the crop season.

中文翻译：

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使用瓜尔胶维持可用水资源的赤字灌溉策略

灌溉用水的逐渐枯竭是世界干旱和半干旱地区农业经济的主要威胁。耐旱作物和改进的灌溉管理实践可能有助于该地区农业的可持续性。进行了为期三年的田间试验（2018-2020），以评估季前和季中灌溉对两个不同瓜尔豆品种的生理、生物量生产、产量和产量组成的影响。采用了分割地块设计，其中主地块进行预灌溉，子地块包括反季节灌溉处理，子地块是栽培品种。每种处理每年重复四次。与没有预灌溉的地块相比，预灌溉使平均最终种子产量提高了 32%。种子产量受到基于季节生长阶段的灌溉处理的显着影响。多年来平均来看，充分灌溉获得了最高的种子产量，尽管在任何研究年份的营养生长阶段与不灌溉没有显着差异。品种Kinman在生物量产量和种子产量方面表现优于Monument。总体而言，预灌溉可改善瓜尔胶的生长和发育，从而提高种子产量和生物量产量。利用现有水资源的最可持续的策略是在营养生长期限制灌溉的情况下种植瓜尔豆，节省 22% 的水，并保持与整个作物季节接受灌溉的田块相似的种子产量。