Name one biodegradable fertiliser.

Explanation

**Step-by-Step Solution:**

1. **Understanding Biodegradable Fertilizers:**
- Biodegradable fertilizers are made from organic compounds. These compounds are capable of being broken down by microorganisms in the soil.

2. **Nutrient Value:**
- Organic compounds have a high nutrient value, which is beneficial for plant growth. They enrich the soil and improve its structure.

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