soil temperature variation with depth in a bulb garden
Laura & Dave (Thu, 21 Nov 2013 14:41:16 PST)

Interesting thread, thanks for sharing!
I would just like to add to what Leo mentioned regarding water and it's
effects, for when you (or others) get to that stage. Water moves, and I've seen
some abstracts of studies that show how air, nutrients as well as temperature
effects are carried down through the soil. It's been a while, but I seem to
recall that the more porous the soil, the greater the depths effects are seen.
There were other factors influencing this, such as soil moisture saturation, and
frequency and duration of precipitation. For instance, a cold, hard rain after
a dry spell chills deeper. And no, I don't have a clue as to where I saw this,
many years ago.

If I may ask, where did you find these thermistor devices? I wonder if they
could be modified so that the data could be recorded realtime. Also, if one of
the devices failed you would know it, and could take action. I've been working
some with the Arduino type micro controllers, and there is a vast resource base
of the cleaver things that people have done with them.

Dave Brastow
Tumwater, Washington USA - just starting a week of sunny days, with high temps
reaching the low 40's during the day, and mid-20's at night. Quite unusual for
around here, and a bit rough on the emerging bulbs, but a welcome respite from
the rain.

P.S. Gastil,I was looking at some of your other photos; is that lovely plant
you're measuring in IMG_4575 a /Libertia caerulea/?