[Market-farming] tracking soil temps

Road's End Farm organic87 at frontiernet.net
Tue Jul 21 09:33:45 EDT 2009


On Jul 21, 2009, at 9:20 AM, Marcy Nameth wrote:

> The temps vary widely during the day and during cold spells and I was 
> just thinking that it wouldn’t be very reliable to use when I read 
> under corn to use the 9:00 a.m. soil temp.
> Johnny’s points out that it also makes a big difference if you’re 
> using untreated (vs treated) seeds.
> My thermometer has a 5” probe and I put it all the way in.  I’m sure 
> depth makes a difference too and I may have been too deep.   Does 
> anyone else know?
>

I think you're supposed to use the temperature from about 4" down; but 
am not sure. I am sure you don't use the surface temperature, though, 
or go extremely deep ; just not sure whether it's supposed to be 3" or 
4" or 5".

In addition to the treated/untreated seed differences, some varieties 
are much more cold tolerant than others. Provider green bean, for 
instance, will come up in quite cold soil, though slowly; but the 
yellow beans I've tried need warm soil, over 60º (at 4" deep around 9 
AM.)

-- Rivka; Finger Lakes NY, Zone 5 mostly
Fresh-market organic produce, small scale
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