[JT118]

Not just soil temp; perhaps this thread should be Agri applications:

http://www.ebay.co.uk/itm/Soil-Hygromete...51b6ea0ff7

http://www.ebay.co.uk/itm/Decagon-Leaf-W...3cfd8c542e

For Soil Moisture:

and / or:

I have one of these below Davis 7846 Leaf Wetness, I think they all work on the same principle.

7846_spec_rev_B.pdf Size: 54,6 KB  Downloads: 297

+ some Degree day sums!! Becomes an even more useful agricultural tool. Another TX type board perhaps; at ground level.

Also one of these based on a 10K NTC thermistor;

7819_spec_rev_C.pdf Size: 78,87 KB  Downloads: 275