Investigation of Water Stress Status of Olive Trees Using Crop Water Stress Index

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ASGARI AZIMEH; Hooshmand Abdolrahim; BROUMAND NASAB SAEED; ZIVDAR SHOHRE

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Journal: Iranian Journal of Soil and Water Research Year:2020 | Volume:51 | Issue:5 Page(s): 1239-1253

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Title

Investigation of Water Stress Status of Olive Trees Using Crop Water Stress Index

Author(s)

ASGARI AZIMEH | Hooshmand Abdolrahim | BROUMAND NASAB SAEED | ZIVDAR SHOHRE | Issue Writer Certificate

Keywords

Crop Water Stress IndexQ1

Infrared ThermometerQ1

Non-Water Stress BaselineQ1

Olive TreeQ1

Abstract

The aim of this study was to assess the Crop Water Stress Index (CWSI), derived from leaf temperature using Infrared Thermometer measurements, to investigate the water stress status and irrigation timing of Olive Trees. Fpr this purpose a regression function was determined between Crop Water Stress Index and relative water content of leaf (RWC) and soil water content (SWC). The experimental treatments involved two olive cultivars (Koroneiki and T2) and four water regimes (irrigation of 100, 85, 70 and 55% of crop water requirement). The results showed that the non-water stressed baseline is varied throughout the study period as well as during the day. The daily variations of non-water stressed baseline were mainly due to variations in the intercept of the non-water stressed baseline that can be explained by variations in zenith solar angle. After investigating the relationship between vapor pressure deficit (VPD) and the difference between crop and air temperature (𝑇 𝑐 − 𝑇 𝑎 ), the equation of Tc-Ta =-0. 45 VPD+1. 06, r2 = 0. 99 was determined for the non-water stressed baseline of the Olive Trees at 12: 30 pm. Crop Water Stress Index of Olive Trees increased significantly in deficit irrigation regims compared with control trees. Crop Water Stress Index was significantly correlated with relative water content (Kroneiki: r2=0. 82**, T2: r2=0. 80**) and soil water content (Kroneiki: r2=0. 66**, 𝑇 2: r2=0. 69**). Therefore, the Crop Water Stress Index is a good indicator of the water stress status of the Koroneiki and T2 Olive Trees.

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APA: Copy

ASGARI, AZIMEH, Hooshmand, Abdolrahim, BROUMAND NASAB, SAEED, & ZIVDAR, SHOHRE. (2020). Investigation of Water Stress Status of Olive Trees Using Crop Water Stress Index. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 51(5 ), 1239-1253. SID. https://sid.ir/paper/367192/en

Vancouver: Copy

ASGARI AZIMEH, Hooshmand Abdolrahim, BROUMAND NASAB SAEED, ZIVDAR SHOHRE. Investigation of Water Stress Status of Olive Trees Using Crop Water Stress Index. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2020;51(5 ):1239-1253. Available from: https://sid.ir/paper/367192/en

IEEE: Copy

AZIMEH ASGARI, Abdolrahim Hooshmand, SAEED BROUMAND NASAB, and SHOHRE ZIVDAR, “Investigation of Water Stress Status of Olive Trees Using Crop Water Stress Index,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 51, no. 5 , pp. 1239–1253, 2020, [Online]. Available: https://sid.ir/paper/367192/en

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