mdlwn1 Yep I don't have 30 years experience as a super salesman with True Brown, But when I went to school Clay had a high CEC and sand had very little CEC. Sorry but I don't remember anything being said that Clay in West or Mid West was different than the East. However soil profiles are very different one end of a yard to the other. Clay also is famous for run off where sand leaches. I am sure the Tree Huggers would be very up set about applying a lot or heavy of any Fertilizer element to clay soil. There comes a point where the Exchange sites of clay, Sand or Loam can only hold so much and the rest is either run off or leached to non target areas like our water supply. Florida and many other areas, Political correctest now has caused Fertilizer laws that limit the amount of Fertilizer to be applied per Thousand sq ft. Now the other side of the coin is the agronomics of applying Too much Fertilizer. Besides hurting the environment because you are a fool, you hurt your own bottom line because you never learned any better. But it is too bad that many states give away Licenses in Crack Jack boxes to every fool.