My soil sample has been sitting in the hot cab of my truck for several weeks. If I have it tested by the Ag Service Lab, will the results still be OK?

YES

This applies, however, only to soil samples being tested for pH and the minerals included in the standard soil test by the Ag Service Lab, i.e., P, K, Ca, Mg, Zn, and Mn. Soil samples to be tested for nitrate nitrogen (rarely necessary) need less abus ive treatment. If you're sending in the sample for nematode assay, you might as well throw it away. The nematodes are all dead.

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