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2 responses to “Cal-Mag Sources”

1. 

   NayHay

   12/07/2023

   Magnesium sulfate corrective doses up to 1-2 Tablespoons/gallon. With cannabis-specific soil blends I’d say a teaspoon per gallon should be plenty, but go heavier if you see interveinal chlorosis. I haven’t seen gypsum as a water-in additive, I’d just put a dusting on the surface, although not sure it is needed with BAS blends since they already put some in there. Also not sure how available gypsum is as a nutrient, might do better with earth worm casting tea for a fast calcium (and nitrogen) boost.

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   1. 

      StonedMycology31

      12/12/2023

      Thank you for the response. Do castings also provide magnesium or is it better to just add a little to the water when making the tea?

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