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Re: [nafex] Ultra hardy rootstocks






>From: Bernie Nikolai <Nikolai@v-wave.com>
.  Minimum soil temperatures at 1 ft. under the soil hit
>-14.1C.  All Siberian Crab and all Ranetka came through undamaged.

Bernie, do you measure ground temperature, or are the figures you quote from 
research stations? I'm wondering what kind of thermometer is used.
Mn. Del
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