Posted by paul on March 11, 2022 at 09:57:06 from (66.60.209.84):
In Reply to: Fertilizer value posted by cjunrau on March 11, 2022 at 09:04:02:
You pose an interesting question. It depends so much on expectations and goals and then the dirt and climate you have.
Its been said if our national corn yield goes down 10 bu an acre we have a real disaster on our hands. Any one field I might get 110 bu or 203 bu depending on the weather; but nationally that averages out.
You can mine p and k out of good dirt for a long time. Eventually you fall off the cliff where it gets used up and yields fall a lot. Until then everything looks fine.
Corn needs n, so something is going on there where some n was always supplied? Manure or it used to be a hog pen or you have very high organic matter soil?
We add sulfur, boron, and other micro nutrients too. You will not have all of these in balance.
Most of us grid sample and apply maybe every 2.5 acres a different amount of fertilizer to balance each square of dirt a different amount to use the fertilizer where it is needed, not just apply the same amount everywhere.
If you have great soil to start with and keep your expectations low, you can get by with slathering some fertilizer every now and then and call it good. Not the best use of resources tho.
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