You need to find bags that are higher in K aka ...Potassium aka....potash and smaller in N and P. If you use 12-12-12 to satisfy your K, you will be putting on 265 lbs of N per acre. With this rate, you would be shooting for 300+ bu per acre of corn.
Potash is sold as 0-0-62 in my area. With 62% of the total weight as K, you would need to spread 427 lbs of product. (265 lbs/.62= 427)
For starter fert on my corn, I use a 50/50 mix of DAP and Potash. This gives me 9-23-31. I put on 250 lbs per acre so...N 22.5 lbs P 57.5 K 77.5
DAP, diammonium phosphate, is 18-46-0. This means 18% is N 46% is phosphorous and zero K.
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