What Is Rock Phosphate: The Use Of Rock Phosphate Fertilizer …
How to Apply Rock Phosphate Fertilizer. Rock dusts are best applied in early spring. Aim for 10 pounds (4.5 kg.) per 100 square feet (30.5 m.), but be sure to read about application rates on the package label as they may vary. Adding rock dust to compost will add available nutrients for plants. Use this compost heavily in your …
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