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notascrename

how much gypsum ?

notascrename
9 years ago

I'm growing some coffee arabica in pots and foliar analysis shows low calcium. NPK are all ok, ph is 6 and rising from lime application when I made up the mix. I need to bring the plant calcium up from .42% to 2% in a three gallon pot. How much gypsum would you add? any insight appreciated, Jim

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