On Tue, 23 Sep 2003 13:12:31 +0100, John Edgar wrote:

Does anyone know the differences between frost, air frost and ground
frost and the implication each has for plants.

The beeb link already posted is good. In relation to plants a ground
frost is probably the worse as that is temperature measured at ground
level near foliage and *generally* speaking you'll get a ground frost
forming before the actual air temperature has reached 0C.

We had a moderate ground frost last night, still unthawed in the shade
at 0900 despite bright clear sunshine since dawn (0730) and the air
temp rising from 0.8C to 8C in those 1 1/2hrs.

--
Cheers
Dave. pam is missing e-mail