Recent Examples of greensand from the Web
Bonemeal is a good source of phosphorus, and kelp or greensand are organic sources of potassium.
For each cubic foot of mix add 4 ounces of dolomitic limestone, 1 pound of rock phosphate or colloidal phosphate, 4 ounces of greensand, 1 pound of granite dust, and 2 ounces of blood meal.
Organic materials including compost, animal manures, blood meal or rock phosphate and greensand can be used for fertilizer as well.
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