As one who works in soil much of the time ( engineering; not agricultural) the toughest part of any soils test is obtaining that mythical "representative sample".

I did a job several years ago where the Engineer went with me to collect samples. He took a sample on which we subsequently ran a full battery of tests. We then did the testing for the next 5 years of construction on that site. I am certain that the shovel-full of earth that the Engineer obtained was the ONLY shovel-full of that particualr soil on the entire 200+ acre sit. We never matched it up with any soil used anywhere.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags