Evapotranspiration and irrigation scheduling
Transcript of Evapotranspiration and irrigation scheduling
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Evapotranspiration
and irrigation
scheduling
Kati Migliaccio, PhD PE Professor Agricultural & Biological Engineering
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Irrigation scheduling
Time, place, and amount
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Credits: UF S.M. Gutierrez
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Amount
How much water is needed?
What strategy do you want to use?
Fill to field capacity?
Fill to a deficit?
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Field capacity or deficit
irrigation
4 http://www.stevenswater.com/articles/irrigationscheduling.aspx
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Deficit irrigation
Primed acclimation – targeted deficit irrigation
to promote future resilience
Continual deficit irrigation
Strategy to anticipate rainfall
Feel that current methods over estimate irrigation
need
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Scheduling
Methods
Soil water content or soil moisture based
Evapotranspiration based
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SMS based
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SMS
Advantage:
• Measurement of
water in the soil
• Can be integrated
into controllers
Disadvantage:
• Point measurement
• Wires / electronics
Also – can use tensiometers
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Soil moisture content
Requires a sensor
Set a threshold or value of maximum depletion at
which scheduled irrigation will occur
Sensor placement is critical
Research has shown significant water savings with this
method (up to80% in some places with average
savings approx. 30%)
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Examples
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Next step
EDIS documents on SMS (see handout)
Discuss with local agent/specialist
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ET based
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Advantage:
• Data may be freely
available
• Data easy to
collect
• Can be integrated
into controllers
Disadvantage:
• Rainfall if not site
specific may be
incorrect
• Must know crop
coefficient (Kc)
Measures
rainfall,
estimates ET,
calculates a
soil water
balance
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ET
Weather data needed
Can use remote or site collected
data
Site collected rainfall improves
method in Florida
Must know crop coefficient
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Crop coefficient
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ET scheduling tools
FAWN tools (Dr. Morgan will discuss)
Smartirrigaton apps (smartirrigationapps.org)
Commercial products (weather stations with ET
estimation software)
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Smartirrigation apps
Avocado, citrus, cotton,
strawberry, vegetable (tomato,
cabbage, squash, watermelon)
Coming: peanut
Crop coefficients are built into the
apps; weather data from FAWN
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Advantages of apps
Easy to take with you, accessible
Updated automatically
Once set up, do not have to re-input
information
Kcs based on UF IFAS research for specific crop
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Disadvantages of apps
Limited crops
Rainfall is not part of the generated schedule
and must be considered by the user
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How do the apps work?
Download from play stores (iOS / Android)
Register (accept notifications)
Input irrigation, soil, site information
Schedule generated every 15 days based on
measured ET and crop coefficient
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More information on apps
http://smartirrigationapps.org/
Vegetable & citrus app: Dr. Kelly
Morgan
Avocado app: Dr. Kati Migliaccio
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ET-based controllers
Some ag products
available
Some landscape products
can be applied
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ET next steps
Decide method (app, weather station,
commercial product)
EDIS documents (series by Kisekka)
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Summary
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Irrigation
schedule Deficit or fill
to capacity
ET controller /
weather station FAWN App
ET based
SMS or
tensiometer
based
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Acknowledgements
Tina Dispenza, graduate students
Rick Lusher / FAWN, Osceola County Extension
Office
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Contact:
Kati Migliaccio