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Old 05-04-2011, 07:02 PM
Bluelude1 Bluelude1 is offline
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What is a good way to calculate the evapotranspiration rate ?

I have been trying to locate a good way to calculate the evapotranspiration rate and haven't had much luck. Any suggestions on where I could find a little bit of additional information on something like this?
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Old 05-04-2011, 07:27 PM
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dKoester dKoester is online now
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Search the internet, its there.
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Old 05-04-2011, 07:32 PM
Darryl G Darryl G is offline
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It's not a simple calculation and you may have a hard time finding the data to calculate it. You really need a meteorological station in order to do it, and even then the best you're going to get is an estimate. You could directly measure the evaporation rate relatively easily, but that would only give you information of what it under the specific conditions at the time and would not give you transpiration. My best advice would be to try to do a search and see if you can at least find a range from already existing data/calculations.
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Old 05-04-2011, 07:52 PM
Bluelude1 Bluelude1 is offline
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Ya I am really only looking for an average range. Our weather down here in Southern Florida is pretty static with about a 10-12 degree variation from the daily high & low.
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Old 05-04-2011, 07:55 PM
Darryl G Darryl G is offline
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Do you have an agricultural extension service in your county? They should be able to give you some ballpark figures. The thing is that it depends on the temperature, the amount of sunlight and it's intensity, the relative humidity and the windspeed too, as well as the crop. And it has diurnal (day/night) variations as well since plants generally aren't taking up water at night....not to mention seasonal variations. I had to know all this stuff a long time ago when I took a graduate level hydrology class....long long time ago...lol
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Old 05-04-2011, 07:56 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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http://www.google.com/search?q=flori...ient=firefox-a

I searched. You should find an answer ^^^^^^
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Old 05-04-2011, 08:22 PM
Bluelude1 Bluelude1 is offline
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Finally found something that I think will work. Thanks for all the help

http://fawn.ifas.ufl.edu/tools/et/graphic.php?locId=420
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Old 05-04-2011, 08:57 PM
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Mike Leary Mike Leary is offline
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Quote:
Originally Posted by Bluelude1 View Post
I have been trying to locate a good way to calculate the evapotranspiration rate and haven't had much luck.
What for? A Lincoln (or better) probe is far more accurate in determining moisture at the base of the plant than any e.t.p. data, unless you got a weather station.
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Old 05-04-2011, 09:16 PM
Kiril Kiril is offline
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Quote:
Originally Posted by Bluelude1 View Post
Finally found something that I think will work. Thanks for all the help

http://fawn.ifas.ufl.edu/tools/et/graphic.php?locId=420
That is reference ET .... be sure you understand what that means.
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Old 05-04-2011, 10:27 PM
hamham hamham is offline
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http://www.soils.wisc.edu/uwex_agwx_...t/yestFLet.gif
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