Bob, I can't speak for the 15-30-15, but the calnitrate would be 4 ounces per 100 gallons and the mgso4 would be the same. When u get to the 2nd flower cluster, bump the cal nitrate to 8 ounces per 100 gallons.
I find it's easier to convert the dry ounces to grams and then divide by 100 to get the per gallon rate.
This gets fed to containers daily. In a 12" pot, not gonna need a whole lot until they get bigger.
4-18-38 pairs nicely with the other ferts. It is 8 ounces per 100 gallons in all stages and will supply the high levels of potassium that will be needed.
These powders are cheap compared to buying liquid concentrates if you will be feeding lots of plants over time.
You mix them into your bucket/tank one ingredient at a time.
Last edited by PureHarvest; April 22, 2017 at 07:23 AM.
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