March/April 2024 - 19

WATER MANAGEMENT
" What we know right now is that the sensors are really good at capturing the
variability of relative stress, but there are differences and we are still trying to
understand the relative magnitude. " - Mallika Nocco
used drones to make scale maps. " We can also get some
understanding of crop water stress when we have this highresolution
data. We can also look at how those rates change
over time and how they are different from trees around it.
This is how we can understand if a particular tree is stressed
using evapotranspiration. "
The measurements can also help compare the actual water
use to the evaporative demands of the environment.
" If we see a high level of evaporative demand and a low
level of evapotranspiration, that means the tree is not
meeting the demand of the environment because it doesn't
have enough water, " Nocco said. " We are trying to develop
tools that will be accessible and inform those working in the
space with the best available scientific data. "
Photo courtesy of the Almond Board of California.
A graduate of the University of Miami, Keith Loria is an
award-winning journalist who has been writing for almost 20
years. View his recent writing at keithloria.contently.com.
recently submitted a paper for peer review based on their
look into how the tools were being used on Central Valley
almond trees.
" What we know now is that the sensors are really good
at capturing the variability of relative stress, but there
are differences and we are still trying to understand the
relative magnitude, " Nocco said. " On the same day, if you
go out and take a reading on stem water potential, and
compare it to the readings from one of the sensors, that's
what we are evaluating. "
Remote sensing is also being utilized more, Shackel
says, and this utilizes satellite data, drone data or airplane
data to try to map water stress at the tree. Thermal
imaging is involved.
" It gives you a different version of water stress because
you're able to look at it for the whole orchard and can
detect problem areas, " he said. " They also are helpful for
understanding issues with distribution uniformity. "
Ongoing research
Nocco is also currently part of a large collaboration of
researchers involved in an irrigation and water project
tailored to tree crops called Tree-Crop Remote Sensing of
Evapotranspiration Experiment (T-REX), which is trying to
understand crop water use as best as possible, and part of
that is understanding crop water stress.
" The future I would hope for from this experiment is
to have a tree-scale estimate of evapotranspiration that's
continuous, " she said, explaining her research group
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March/April 2024

Table of Contents for the Digital Edition of March/April 2024

Editor's Letter
The blight phase of Botryosphaeria diseases in nut crops of California
Tree nut outlook for 2024
From the top
Water stress
Buzz pollination
Hazelnut crop concerns
Business
Almond Board of California
Ad Index
Events
March/April 2024 - 1
March/April 2024 - 2
March/April 2024 - 3
March/April 2024 - Editor's Letter
March/April 2024 - 5
March/April 2024 - The blight phase of Botryosphaeria diseases in nut crops of California
March/April 2024 - 7
March/April 2024 - 8
March/April 2024 - 9
March/April 2024 - Tree nut outlook for 2024
March/April 2024 - 11
March/April 2024 - 12
March/April 2024 - 13
March/April 2024 - From the top
March/April 2024 - 15
March/April 2024 - 16
March/April 2024 - 17
March/April 2024 - Water stress
March/April 2024 - 19
March/April 2024 - Buzz pollination
March/April 2024 - 21
March/April 2024 - Hazelnut crop concerns
March/April 2024 - 23
March/April 2024 - Business
March/April 2024 - 25
March/April 2024 - Almond Board of California
March/April 2024 - Events
March/April 2024 - 28
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https://www.nxtbook.com/greatamericanmediaservices/NNG/november-december-2022
https://www.nxtbook.com/greatamericanmediaservices/NNG/september-october-2022
https://www.nxtbook.com/greatamericanmediaservices/NNG/july-august-2022
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https://www.nxtbook.com/greatamericanmediaservices/NNG/fall-2021
https://www.nxtbook.com/greatamericanmediaservices/NNG/summer-2021
https://www.nxtbook.com/greatamericanmediaservices/NNG/winter-2021
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