PipeCarver
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Okay, great but what are you looking for from a slurry test that a proper runoff test won't give you? We're not talking about the 1/100 decimal point to be accurate.I know this is older but IU yse a SS drinking straw the wider the better.. and I wiggle push it down into soil give a twist and pull it out and tap the soil out into test container.. I pull from 3 places around plant and only use the bottom half of soil for testing to ensure a deep pull for test... then do the slurry test as described above! That how I do it and has worked so far!
If you get a runoff test that says 5.35 then you know you have a low ph problem. A slurry test may be more accurate by giving you a 5.28 or the other side5.43 Either way it doesn't matter you're going to take the same measures to get your ph up.
It's highly unlikely you'll take a runoff test reading of 5.3 and a slurry test of 7.5. Both readings will be close enough so that the difference is negligible to the results.
I don't care what you probe into the soil unless you're growing turnips you'll damage roots, even if you some how don't damage any does the sample give you different results from a runoff test?