Anyone have any thoughts on whether you can combine Serenade with Kelp Help and/or Iron and/or Soil Conditioner? I was thinking the latter might be an issue since it has the soap...

Well depending on the iron it does not get watered in. The rest get watered it at some point to activate so I don't really see the problem but you never know.

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I put down Serenade with TKO phosphite and iron to save some time. I don't know about the soap but would guess that as long as it's not antibacterial soap, it should be OK. I've even wondered about regular tap water with the chlorine or chloramine. I am guessing that with freshly mixing and spraying, most of the chlorine would out-gas.