Manure is high in nutrients that plants need to grow properly, such as nitrogen, phosphorus, potassium, calcium and magnesium. Different types of animal manure have different levels of these nutrients. For example, sheep and poultry manure are higher in these nutrients than horse or cow manure. However, raw manures can contain levels that are not safe for some plants.
Throw them in your Compost!
For this reason, manures are usually composted or cured before using in the garden. The composting process also breaks down the nutrients into forms which are easier for plants to absorb and can be easily applied right to growing vegetable plants.
The bad news is that even composted manure can still retain hormones, antibiotics, viable weed seeds, pesticides and diseases. In fact, while rare, Salmonella and E. coli have both been found in well composted manures and can be transmitted to food crops, especially those that are eaten raw. The drawbacks of manure fertilisers certainly do exist and steps need to be taken to avoid issues. These might include soil testing to determine the amount and type of manure, using low tillage methods by spreading manure the season prior to planting, and sourcing manure from organic farms where tox