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• One of three common types of fertilizer, the other two are inorganic and synthetic organic.
• Does not dissolve in water.
• Converted to usable forms by microorganisms in the soil.
• Helps to create proper physical growing conditions, but can add disease or weeds to the lawn.
• Usually does not contain a complete mix of the essential nutrients, making it necessary to apply additional types of fertilizer.
• Less concentrated than synthetic fertilizer.
• Slow-acting release.