On Wed, 13 Feb 2008 11:11:12 -0000, "Bertie Doe"
wrote:

Chatting to neighbouring allotment holders, it seems that soil temps play a
big impact on seed germination. I believe root crops, such as carrot and
parsnip are particularly sensitive.
Are there any reference books available, which give suggested minimum sowing
temperatures? TIA.

Bertie

http://tomclothier.hort.net/page11.html

I have vague memories of there being a terrible story about how some
bloke claimed to measure how warm the soil was.
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