High salts may also be a problem in biosolids. These materials are usually free from contaminants, although plastic yard clean-up bags may sometimes be included. If construction debris is allowed, it should not include treated lumber and non-organic materials such as shingles and nails. Some may contain straw, hay, or woody materials as bedding. The poultry manures are usually highest in nitrogen and phosphorus.
Salts can be a problem in some manures.
They may include all types of foods, as well as paper that has been used in food preparation or serving. Composting Methods vary depending on factors like feedstock, amount of compost, facility size, time requirements, weather, equipment required, and economics. This is the least expensive, but slowest method. Material on the outside of the pile may not be exposed to heat needed to kill weed seeds or disease organisms. Frequency of turning varies according to the operation.