Q&A – What are some of the best long-term organic fertilizer options?

From Family Plot.

Phosphorus and Potassium are relatively stable in the soil, but nitrogen is short lived in the soil. Retired MSU Horticulture Specialist Dr. Lelia Kelly says most long-term or slow-release fertilizers are focused on nitrogen. She also gives amendments that will increase potassium and phosphorus if needed.

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