Correlation between canopy temperature based water stress indicators and soil water status in almond trees under simultaneous salinity and water stress

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Onnabi Milani Ajdar; Zarrinbal Mohammad

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Journal: Journal of Water and Irrigation Management Year:2018 | Volume:8 | Issue:1 Page(s): 69-84

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Title

Correlation between canopy temperature based water stress indicators and soil water status in almond trees under simultaneous salinity and water stress

Author(s)

Onnabi Milani Ajdar | Zarrinbal Mohammad | Issue Writer Certificate

Keywords

Available water depletionQ1

Irrigation schedulingQ1

Plant water relationsQ2

Soil water contentQ1

Vapor pressure deficitQ1

Abstract

One of the non-invasive and remotely sensing method for measuring plant water status, and also irrigation automation, is using canopy temperature as an indicator. This study aimed to evaluate the combined effect of salinity and drought stress on almond water status. The trial was conducted based on randomized complete block design with three replications on a loamy sand soil. Treatments comprised three irrigation salinity levels viz. 2 (T1), 4 (T2), and 5 (T3) dSm-1. Canopy (Tc) and air (Ta) temperatures, relative humidity and integrated volumetric Soil water content (SWC) at three depths (0˗ 20, 0˗ 40, and 0˗ 70) were measured at midday (12˗ 14) during the growing season. Results indicated that salinity has significant effect on Tc, Tc-Ta and Available water depletion (AWD). Seasonal averages of Tc for treatment T1 to T3 were 31. 9, 32. 7 and 33. 6 oC, respectively. Significant correlation was found between Tc, Tc-Ta, SWC and AWD. Threshold value of Tc for initiating stress in treatment T1 to T3 was obtained to be 31. 6, 30. 3 and 28. 4 oC, respectively. Corresponding SWC for these Tc were 8. 70, 11. 01 and 14. 07 %, respectively. High correlation between Tc and soil water status, shows that midday canopy temperature may be a useful tool for assessment of water status and precision Irrigation scheduling of almond orchards.

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APA: Copy

Onnabi Milani, Ajdar, & Zarrinbal, Mohammad. (2018). Correlation between canopy temperature based water stress indicators and soil water status in almond trees under simultaneous salinity and water stress. JOURNAL OF WATER AND IRRIGATION MANAGEMENT, 8(1 ), 69-84. SID. https://sid.ir/paper/240109/en

Vancouver: Copy

Onnabi Milani Ajdar, Zarrinbal Mohammad. Correlation between canopy temperature based water stress indicators and soil water status in almond trees under simultaneous salinity and water stress. JOURNAL OF WATER AND IRRIGATION MANAGEMENT[Internet]. 2018;8(1 ):69-84. Available from: https://sid.ir/paper/240109/en

IEEE: Copy

Ajdar Onnabi Milani, and Mohammad Zarrinbal, “Correlation between canopy temperature based water stress indicators and soil water status in almond trees under simultaneous salinity and water stress,” JOURNAL OF WATER AND IRRIGATION MANAGEMENT, vol. 8, no. 1 , pp. 69–84, 2018, [Online]. Available: https://sid.ir/paper/240109/en

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