I was wondering if it is a good practice to take several tests from different locations within the acreage that will be used for growing.
Also whether frost heave can effect the tests if they are done during the cold season.
Yeah the instructions are if submitting one sample then combine the various samples into one to get a general results but it is best to submit individual samples from various areas. If a square garden 5 would be a good test of each side and in the middle. The frost probably wouldn't be too much of a problem other than the wet soil when it defrosts or digging the hard soil. This article says it is possible in Alberta.