As a non-synthetic organic fertilizer, chicken manure has numerous benefits. It is a complete fertilizer that contains the macronutrients nitrogen, phosphorus, and potassium, as well as important micronutrients such as calcium needed for healthy plant growth.
Chicken manure is more than a fertilizer though. It is also a good soil amendment; it adds organic matter to the soil, which improves soil structure, moisture-holding, drainage capability, and aeration. Also, soil high in organic matter is less prone to erosion and retains fertilizer better.
The organic matter in chicken manure has another benefit: it feeds soil microbes allowing organic nutrients to break down faster, which in turn makes them available to plants more quickly.