Potash is the cheapest of the three main nutrients. Not that long ago Potash was under a $100 per ton. I think we will be seeing it go even higher. China is buying up the known supplies. They have boughten several companies that own some of the bigger known deposits, world wide.
As for your soil fertility. You can spend the money now and have a better chance at good yields or lose money each year due to lower yields. You are going to pay for it either way. I choose to have good yields myself. Higher yields is the best way to lower the per unit cost. Your fixed cost are spread out over more units.
One thing to remember is that the Potash you spread this year will not be much use this year. Potash is a slow nutrient to break down and become available. I usually try to spread all of my potash in the fall. On any wheat or oat ground I spread it right after I harvest them, if I need it for the next crop. The earlier the better. Even on light snow will not hurt a thing as potash is heavy and does not wash like nitrogen. If you know you need it and the ground is solid enough to spread it get going.
Also needing 1.5 to 2.25 tons of lime is just about normal. Lots of lime would be 4-8 tons per acre. Then you have to split the application over two years. Your lime will also take several years to fully activate. I usually apply extra to get the up front boost I need plus a little more long term gain. If you are using high rate of nitrogen (corn) then you are using lime each year to balance.
What part of Kentucky are you in??? Much of northern areas have a high lime content in the soil naturally. Have friends in Mason county and they rarely have to apply lime.
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