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Inter-relationships between water depletion and temperature differential in row crop canopies in a sub-humid climate
Agricultural Water Management ( IF 6.7 ) Pub Date : 2021-07-09 , DOI: 10.1016/j.agwat.2021.107061
Jasreman Singh 1 , Yufeng Ge 1 , Derek M. Heeren 1 , Elizabeth Walter-Shea 2 , Christopher M.U. Neale 1, 3 , Suat Irmak 1 , Wayne E. Woldt 1 , Geng Bai 1 , Sandeep Bhatti 1 , Mitchell S. Maguire 1
Affiliation  

Irrigation has a great impact on global food security as it contributes to the majority of the world’s agricultural food supply. It is essential to judiciously utilize water resources through efficient irrigation management since the majority of U.S. groundwater aquifers are rapidly depleting. Thus, quantification of the relationships between water depletion and environmental factors is important for understanding crop response to varying levels of water stresses that depletion can cause. The objectives of this research were to: 1) investigate the relationship between root zone water depletion (Drw) and canopy temperature differential (ΔT) at different ranges of Drw; and 2) develop upper (water stressed) and lower (non-water stressed) baselines for quantification of crop water stress index (CWSI) in a sub-humid climate. The research was conducted over maize and soybean during 2018, 2019, and 2020 growing seasons. Sensor node stations comprising of an infrared thermometer and three soil water sensors were installed at various sites over maize and soybean fields. ΔT tends to increase with the increase in Drw when the range of Drw includes values greater than 170 mm for maize and values greater than 160 mm for soybean. The results indicate that ΔT and Drw are unrelated until a soil-water depletion threshold is attained, and these Drw threshold values could be considered as indicators to trigger irrigation for efficient agricultural water management. To the best of the authors’ knowledge, the research is the first to develop upper and lower CWSI baselines for east-central Nebraska. The baselines developed in this study could facilitate the quantification of CWSI for irrigation scheduling of maize and soybean in east-Central Nebraska. Future work should aim to investigate the potential in using Drw and/or ΔT to determine efficient water allocation and if a threshold CWSI could be used for timing of irrigation to prevent yield loss.



中文翻译:

半湿润气候下中耕作物冠层水分消耗与温差的相互关系

灌溉对全球粮食安全具有重大影响,因为它占世界农业粮食供应的大部分。由于大多数美国地下水含水层正在迅速枯竭,因此通过有效的灌溉管理明智地利用水资源至关重要。因此,量化水资源枯竭与环境因素之间的关系对于了解作物对枯竭可能导致的不同水平的水分胁迫的反应非常重要。本研究的目的是: 1) 研究不同 D rw范围下根区水分消耗 (D rw ) 与冠层温差 (ΔT)之间的关系; 2) 为半湿润气候下作物水分胁迫指数 (CWSI) 的量化制定上限(缺水压力)和下限(非缺水压力)基线。该研究是在 2018 年、2019 年和 2020 年的生长季节对玉米和大豆进行的。在玉米和大豆田的不同地点安装了传感器节点站,包括一个红外温度计和三个土壤水分传感器。ΔT倾向于随在d的增加而增加RW时d的范围RW包括值大于170毫米玉米和值大于160mm大豆更大。结果表明,在达到土壤水分耗竭阈值之前,ΔT 和 D rw不相关,并且这些 D rw阈值可被视为触发灌溉以实现高效农业用水管理的指标。据作者所知,该研究是第一个为内布拉斯加州中东部开发上下 CWSI 基线的研究。本研究中开发的基线可以促进内布拉斯加州中东部玉米和大豆灌溉计划的 CWSI 量化。未来的工作应该旨在研究使用 D rw和/或 ΔT 来确定有效的水分配的潜力,以及是否可以使用阈值 CWSI 来确定灌溉时间以防止产量损失。

更新日期:2021-07-09
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