This fertilizer is obtained by thoroughly crushing and drying fish bones or shells.

Recipe:

• Cleaned chicken, beef, or fish bones, free of any fat, or
• Fish shells (bones, spines, etc.)
• Baking tray or frying pan
• Mortar, grinder, or food processor

Steps:

1. Wash the bones or shells and remove any remaining fat or meat.

2. Dry them in the sun for several days or toast them in the oven at a low temperature (120–150 °C) until they are hard and completely dry.

3. Once dry, crush them with a mortar or food processor until you obtain a fine powder.

4. Store in an airtight container, away from moisture.