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A Comprehensive Stress Indicator for...

Drechsler, Kelley Marie.

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A Comprehensive Stress Indicator for Evaluating Plant Water Status in Almond Trees.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Comprehensive Stress Indicator for Evaluating Plant Water Status in Almond Trees./
作者:	Drechsler, Kelley Marie.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	76 p.
附註:	Source: Masters Abstracts International, Volume: 81-05.
Contained By:	Masters Abstracts International81-05.
標題:	Plant sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13897707
ISBN:	9781392389447

A Comprehensive Stress Indicator for Evaluating Plant Water Status in Almond Trees.
Drechsler, Kelley Marie.

A Comprehensive Stress Indicator for Evaluating Plant Water Status in Almond Trees. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 76 p.

Source: Masters Abstracts International, Volume: 81-05.

Thesis (M.S.)--University of California, Davis, 2019.

This item must not be sold to any third party vendors.

The plant water status is an important parameter that indicates when a plant needs to be irrigated. Continuing water limitations coupled with growing demands for food and biomass makes it important to irrigate crops only when necessary. The challenge rests in providing an accurate and convenient feedback of the plant water status in response to irrigation scheduling decisions. The objective of this study was to develop a plant water status indicator that integrates the leaf temperature and the environmental conditions that can provide feedback on the plant response to irrigation scheduling. This quantity-Comprehensive Stress Indicator (CSI)-is based on a reformulation of the leaf energy balance equation. Specifically, CSI is the ratio of the temperature difference between a dry leaf (i.e., a leaf with a broken stem) and a live leaf (on the same tree) [i.e., Tdry-Tleaf] and the difference between the vapor pressure inside the stomatal cavity at saturation and the vapor pressure of the air at ambient temperature [i.e., es(TL)-e(TA)]. The required measurements to compute CSI include dry leaf temperature, live leaf temperature, relative humidity, and air temperature at the tree being monitored. All measurements were obtained using a sensor suite called the leaf monitor, which included two thermal infrared sensors, one for the dry leaf and another for the live leaf, both of which were housed in the same unit under the same ambient conditions due to a diffusing hemispherical dome. The CSI is a dynamic indicator with a value every fifteen minutes. For a single indicator representing each day, the CSI was evaluated in two ways. First, the CSI was integrated with respect to time from 10 AM to 6 PM to obtain the Integrated Comprehensive Stress Indicator (ICSI). Second, the CSI was averaged from 1 PM to 3 PM to obtain the Average Comprehensive Stress Indicator (ACSI). Both ICSI and ACSI were compared to other stress indicators, including the existing Crop Water Stress Index (CWSI) and Integrated Degrees Above Non-Stressed (IDANS). Unlike CWSI and IDANS, ICSI and ACSI have the convenience of requiring measurements only at the tree being monitored (i.e., do not required well-watered baseline). Correlations between ICSI and midday stem water potential (SWP) (R2 ranged from 0.26 to 0.70) and between ACSI and SWP (R2 ranged from 0.20 and 0.72) exhibited high variability across the nine leaves that were monitored. We conclude that ICSI and ACSI can be used to determine when to take stem water potential measurements and can serve as a relative measurement of plant water status.

ISBN: 9781392389447Subjects--Topical Terms:

3173832
Plant sciences.
Subjects--Index Terms:

Crop water stress index

A Comprehensive Stress Indicator for Evaluating Plant Water Status in Almond Trees.
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500 $a Source: Masters Abstracts International, Volume: 81-05.
500 $a Advisor: Kisekka, Isaya.
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520 $a The plant water status is an important parameter that indicates when a plant needs to be irrigated. Continuing water limitations coupled with growing demands for food and biomass makes it important to irrigate crops only when necessary. The challenge rests in providing an accurate and convenient feedback of the plant water status in response to irrigation scheduling decisions. The objective of this study was to develop a plant water status indicator that integrates the leaf temperature and the environmental conditions that can provide feedback on the plant response to irrigation scheduling. This quantity-Comprehensive Stress Indicator (CSI)-is based on a reformulation of the leaf energy balance equation. Specifically, CSI is the ratio of the temperature difference between a dry leaf (i.e., a leaf with a broken stem) and a live leaf (on the same tree) [i.e., Tdry-Tleaf] and the difference between the vapor pressure inside the stomatal cavity at saturation and the vapor pressure of the air at ambient temperature [i.e., es(TL)-e(TA)]. The required measurements to compute CSI include dry leaf temperature, live leaf temperature, relative humidity, and air temperature at the tree being monitored. All measurements were obtained using a sensor suite called the leaf monitor, which included two thermal infrared sensors, one for the dry leaf and another for the live leaf, both of which were housed in the same unit under the same ambient conditions due to a diffusing hemispherical dome. The CSI is a dynamic indicator with a value every fifteen minutes. For a single indicator representing each day, the CSI was evaluated in two ways. First, the CSI was integrated with respect to time from 10 AM to 6 PM to obtain the Integrated Comprehensive Stress Indicator (ICSI). Second, the CSI was averaged from 1 PM to 3 PM to obtain the Average Comprehensive Stress Indicator (ACSI). Both ICSI and ACSI were compared to other stress indicators, including the existing Crop Water Stress Index (CWSI) and Integrated Degrees Above Non-Stressed (IDANS). Unlike CWSI and IDANS, ICSI and ACSI have the convenience of requiring measurements only at the tree being monitored (i.e., do not required well-watered baseline). Correlations between ICSI and midday stem water potential (SWP) (R2 ranged from 0.26 to 0.70) and between ACSI and SWP (R2 ranged from 0.20 and 0.72) exhibited high variability across the nine leaves that were monitored. We conclude that ICSI and ACSI can be used to determine when to take stem water potential measurements and can serve as a relative measurement of plant water status.
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653 $a Integrated degrees above non-stressed
653 $a Leaf temperature
653 $a Stem water potential
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