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Using and selling worm castings and worms

Worm castings can be used as fertiliser on your farm.

Adding castings to soil improves soil structure and water-holding capacity. The casts are also rich in nitrate, phosphorus, potassium, calcium and magnesium. They offer a good natural substitute for chemical fertilisers.

The chemical composition of castings will depend on the ingredients used in the composting process.

A typical chemical composition of worm castings is shown below.

Nutrient

Percentage

Nitrogen

2

Phosphorus

1.2

Potassium

1

Sulphur

0.4

Calcium

1.5

Magnesium

0.4

Iron

0.7

The composting process converts the nutrients into forms that are more readily available to plants. Nutrients contained in castings are released slowly, reducing the risk of nutrient loss by run-off, volatilisation and leaching.

Castings can also be sold to nurseries and other garden suppliers, or direct to the public. Some pig farmers in Australia and overseas make extra income by selling castings. Opportunities to sell castings will vary in different areas. Use our market research kit to research these opportunities.

Selling worms

Worms are also a saleable product. Worm farmers most commonly sell worms to other farmers, nurseries/gardeners, and fishers or bait suppliers. Worms are marketed by weight, and weigh between 250g and 500g per thousand.

The Australian market price for worms varies greatly, so you will need to research it yourself.

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