Originally Posted by Toro 44
Sulfate of Potassium aka Potassium Sulfate.
I saw in a 2011 thread on liquid fert that you told green doctor that you found an affordable source for soluble SOP. Did you ever try spraying it?
No I didn't, I'm not really set up well for liquid fert.
I have my dry ferts custom blended to use SOP, maybe that's what I was speaking of.