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Alton, Ia | Every 4 years, 4.4 acre samples (less than 10 acre grids, per the Iowa DNR MMP rules). We only VRA the lime, so not a big benefit to having tighter test results. Hard to VRA manure with good accuracy. Our fertility is quite high, so even if we have a great year and remove more nutrients than planned, we are still covered.
The most important fertility item is Ph, fix that first.
Edit: before manure, we did 2.2 acres every 4. Please excuse me if this comes across wrong, but how did it happen to go 20 years?
Edited by Oliver1 12/1/2014 15:58
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how often do you soil sample?
