Read the soil report very carefully. There is no such thing as no potash. It is more likely in Michigan--that potash was adequate and they were suggesting no potash was needed.
Regarding potash, How many pounds per acre did they say you had?
The usual fertilizer for midwest soils is about a 4 to 1 ratio of nitrogen to potash.
For instance a ratio of 28-0-7 would work Ok. But the nitrogen should be about 50 percent as slow release nitrogen.
Sandy soils need a little more potash. Soils with low organic matter would need a steady supply of potash, as such low-quality soils so not retain potash very well. Likewise soils that receive heavy irrigation lose potash due to leaching--potassium (potash) compounds are mostly water soluble.