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(More customer reviews)Glauconite, or greensand, is a clay-based sediment from ancient seabeds and a by-product of oil drilling. It contains significant amounts of potassium, but its primary benefit to plants is that it contains a balance of the trace minerals so often deficient in overworked soils.
Copper, iron, manganese, molybdenum, and zinc may all be present in greensand in the small but vital amounts needed by growing plants. Greensand may also contain boron, calcium, magnesium, and sulphur, but not in sufficient quantities to ensure adequate availability.
Don't be misled by the relatively low potassium analysis. Greensand is an excellent supplement for any garden, especially on overworked previously agricultural land.
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Actually 'iron potassium silicate', Texas Greensand is an excellent source of iron and other trace elements. Use as a soil additive on lawns, beds, and potted plants. Application rate: 10 to 20 lbs. per 1,000 sq. ft.
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