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For Slow-release Potassium & Trace Minerals New Jersey Greensand (also known as glauconite) is an organic source of potassium (3%). Mined from a 70-80 million year old marine deposit consisting of iron-potash-silicates and marine trace minerals. Naturally high cation exchange capacity, resulting in a slow release of potassium, useful for building the soil’s potassium reserves, but not appropriate for quick remedy of a potassium deficiency. Apply at 1-2 lb/plant or 5-10 lb/100 sq ft, 500-4000 lb/acre, depending on soil analysis. Sold by the pound or bag.