How much calcium and magnesium?
Like the title says. I have some MSU blend intended for mixing in rain or pure water, 13-3-15 with 8 Ca and 2 Mg. I bought this from First Ray's. Were the calcium and magnesium amounts likely chosen based on what the plants need, or what will remain soluble when mixed?
For my semi-hydroponic plants I use it at 1/8 teaspoon per gallon of rain / 0.17ml powder per liter, at almost every watering, which gives about 21ppm nitrogen.
My Vandas in vases get 1 teaspoon per gallon / 1.3ml powder per liter, at almost every watering, which gives about 170ppm nitrogen.
My other seedling plants of various genera get 1/4 tsp per gallon, about 40ppm nitrogen, and my adult plants of various genera get 1/2 tsp per gallon, about 80ppm nitrogen, at almost every watering.
Everything gets kelp in rain about once a month.
Are all my plants likely getting enough calcium and magnesium? Thanks.
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