Determining Threshold Values for a Crop Water Stress Index-Based Center Pivot Irrigation with Optimum Grain Yield

文献类型： 外文期刊

第一作者： Qin, Anzhen

作者： Qin, Anzhen;Ning, Dongfeng;Liu, Zhandong;Li, Sen;Zhao, Ben;Duan, Aiwang

作者机构：

关键词： canopy temperature; soil water storage; crop evapotranspiration; infrared thermometer; Triticum aestivum L.; Zea mays L.

期刊名称：AGRICULTURE-BASEL （ 影响因子：2.925； 五年影响因子：3.044 ）

ISSN：

年卷期： 2021 年 11 卷 10 期

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收录情况： SCI

摘要： The temperature-based crop water stress index (CWSI) can accurately reflect the extent of crop water deficit. As an ideal carrier of onboard thermometers to monitor canopy temperature (T-c), center pivot irrigation systems (CPIS) have been widely used in precision irrigation. However, the determination of reliable CWSI thresholds for initiating the CPIS is still a challenge for a winter wheat-summer maize cropping system in the North China Plain (NCP). To address this problem, field experiments were carried out to investigate the effects of CWSI thresholds on grain yield (GY) and water use efficiency (WUE) of winter wheat and summer maize in the NCP. The results show that positive linear functions were fitted to the relationships between CWSI and canopy minus air temperature (T-c - T-a) (r(2) > 0.695), and between crop evapotranspiration (ETc) and T-c (r(2) > 0.548) for both crops. To make analysis comparable, GY and WUE data were normalized to a range of 0.0 to 1.0, corresponding the range of CWSI. With the increase in CWSI, a positive linear relationship was observed for WUE (r(2) = 0.873), while a significant inverse relationship was found for the GY (r(2) = 0.915) of winter wheat. Quadratic functions were fitted for both the GY (r(2) = 0.856) and WUE (r(2) = 0.629) of summer maize. By solving the cross values of the two GY and WUE functions for each crop, CWSI thresholds were proposed as being 0.322 for winter wheat, and 0.299 for summer maize, corresponding to a T-c - T-a threshold value of 0.925 and 0.498 & DEG;C, respectively. We conclude that farmers can achieve the dual goals of high GY and high WUE using the optimal thresholds proposed for a winter wheat-summer maize cropping system in the NCP.

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