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| Thanks, that's really helpful information!
Is it more likely that farmers will start with a grid method, but switch to zones once they understand similarities within areas? Some labs claim that by knowing your soil type you can save quite a bit on fertilizer, but is that actually true within a 2 year span? Does the soil really change so much in only a few years that different fertilizer applications would mean more saving?
I know there are several other services that labs offer, like grain, fertilizer, and manure analysis. Do farmers ever use these? I wonder if farmers ever question the quality of their fertilizers ... are they actually getting the quality they are paying for?
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Soil/Plant tissue testing
