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| I read an old (about 1950) article in "The Farmer" magazine printed in Minnesota when fertilize was new. They were dumping at least 400 lbs. of N and hundreds more of P&K to get the yield slightly over 100 bushels/acre instead of 60 bushels/acre. It still paid. My thought was the soil had grown crops for a century without any fertilizer and it took a lot to get a yield increase the first year. I would think the amount needed decreased with time as the fertility built up. The charts may reflect the early days of fertilizer.
If I find it I will post it. | |
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200bu corn P&K removal
