Hi Wolfram, I do not have suggestion of thermal imaging for irrigation scheduling, but may be you can derived the relation from soil thermal flow model that coupled with soil moisture model and may be vapor flow in the soil. You can find it in Soil Physics or Environmental Biophysics books. Sorry for not able giving you helpful suggestion, but you question reminded me of what I did in my study.

As far i know Ben Gal of Gilat Res. Ctr. gas done olive ir imaging; p. see irrigation science 2009 archive or open http://www.nuritagam.com/Papers/2009-BenGal-et-al-CWSI.pdf: The theory sound well exploited. Let me check for any further paer.

Wolfram,

There is a lot of publications for this topic, You can find below some of them...

Wolfram,

There is a lot of publications for this topic,

You can find below some of them...

I have shortened some of the URLs to avoid wasting the space here.

Best regards.

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http://bit.ly/1aGtYi6

http://jxb.oxfordjournals.org/content/58/4/827.full.pdf

http://bit.ly/1aSqaH7

http://1.usa.gov/Hp1P4E

http://eprints.usq.edu.au/8637/

http://bit.ly/HryVBl

http://vineyardofthefuture.files.wordpress.com/2012/08/ir-thermo-fuentes.pdf

Wolfram,

I had the pleasure to collaborate with Ralf Ludwig co-ordinator of the CLIMB project. They did a lot of work using thermal IR form satellite.