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Monitoring water status in apple trees using a sensitive morning crop water stress index*
Irrigation and Drainage ( IF 1.9 ) Pub Date : 2020-10-02 , DOI: 10.1002/ird.2528
Abdelmoneim Z. Mohamed 1, 2 , Yasin Osroosh 3 , R. Troy Peters 1 , Travis Bates 4 , Colin S. Campbell 4 , Francesc Ferrer‐Alegre 4
Affiliation  

The crop water stress index (CWSI) has shown to be a good indicator of water status in fruit trees. Conventional CWSI measured over solar noon is widely used to monitor plant water status. This study compared the theoretical CWSI averaged over morning hours, CWSImo, and over solar noon hours, CWSImd, of apple trees. This study also assessed their sensitivity to the changes in soil water status (soil water deficit [SWD, %] and soil water potential [SWP, kPa]) at different root zone depths. Four different types of commercial and experimental apple orchards with different characteristics growing under semi‐arid conditions in Washington State, United States, were chosen to assess CWSImo against CWSImd sensitivity to soil water status. In some of these locations, soil water status ranged from fully watered to severely stressed (low water deficit to high water deficit). Ground‐based thermal and microclimate measurements were recorded continuously at 10‐s intervals and acquired for the 15‐min average on a daily basis throughout the study period. The linear relationship between SWD and CWSImo at the effective root zone depth (average of 0–150 mm and 0–460 mm) resulted in a slightly higher correlation (R2 = 0.42–0.64, p < .001) compared to the traditional CWSImd (R2 = 0.32–0.60, p < 0.001). The correlation between CWSImo and SWP (R2 = 0.38–0.69, p < 0.001) was found to be larger than the correlation between CWSImo and SWD, while SWP was less correlated with CWSImd (R2 = 0.33–0.55, p < 0.001). Interestingly, a better relationship between soil water status and both CWSImo and CWSImd was observed using a nadir view orientation thermal measurement. The CWSImo showed higher sensitivity to SWP than SWD.

中文翻译:

使用敏感的早间作物水分胁迫指数监测苹果树中的水分状况*

作物水分胁迫指数(CWSI)已显示是果树水分状况的良好指标。在太阳午间测量的常规CWSI被广泛用于监视植物水的状态。这项研究比较了苹果树在早晨时段平均CWSI mo和太阳午时段平均CWSI md的理论CWSI 。这项研究还评估了它们对不同根区深度的土壤水分状况(土壤水分亏缺[SWD,%]和土壤水势[SWP,kPa])变化的敏感性。选择了在美国华盛顿州半干旱条件下生长的具有不同特征的四种不同类型的商业和试验性苹果园,以评估CWSI mo与CWSI md的关系。对土壤水分状况的敏感性。在这些地区中,某些地区的土壤水分状况从完全浇水到严重缺水(从缺水到高缺水)不等。在整个研究期间,以10秒的间隔连续记录地面的热和微气候测量值,并每天获取15分钟的平均值。与传统的根部深度相比,SWD和CWSI mo之间的线性关系(平均值为0–150 mm和0–460 mm)导致相关性稍高(R 2 = 0.42–0.64,p <.001)。 CWSI mdR 2 = 0.32-0.60,p <0.001)。CWSI mo与SWP(发现R 2 = 0.38–0.69,p <0.001)大于CWSI mo和SWD之间的相关性,而SWP与CWSI md的相关性较小(R 2 = 0.33–0.55,p <0.001)。有趣的是,使用最低点视图方向的热测量值可以观察到土壤水分状况与CWSI mo和CWSI md之间的更好关系。CWSI mo对SWP的敏感性比SWD高。
更新日期:2020-10-02
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