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Crop Heat Units

Hello veggie-list,

Does anyone know of any shareware or freeware software that deals with
Crop Heat Units?  Sometimes this principle is referred to as Degree
Days.

All plant growth is based on how much heat it gets from the sun, along
with that crops particular base growth heat.  By keeping track of your
daily local heat units, you should be able to judge, when to plant, and
how far along your plants should be.  Comparing that data from year to
year would tell you alot about your specific growing conditions.  We can
control water (prevent draught), and nutrients, but we can only measure
and record heat units, using the information to our advantage.

If someone is an expert in this area I wouldn't mind learning the
specifics, and I will build a MS-Excel spreadsheet to do the work, and
gladly share it with everyone.

Any experts out there?

Thanks,

Tom
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