Your first sentence/paragraph is absurd in the post's context. Crop rotation will not replenish the soils' potassium.
And in your 2nd paragraph.. what do you mean by "similar purpose"? It's ambiguous, how you have used it. Also, do you know anything of how fertilizers work?
Quick quiz: Wheat has b12 vitamin and iodine, can you just eat more bread to replenish your body's neads for those nutrients? Or does a balanced diet need to be ..balanced for all nutrients?