On the other hand, the phosphorus and potassium concentrations will be higher in composted manure. Modify fertilizer practices accordingly. Salt levels also will be higher in composted manure than in raw manure. If salt levels are already high in your Garden soil, do not apply manures. Other composts are available that are made primarily from leaf or wood products alone or in combination with manures or biosolids.
Laboratory tests can determine the salt content, pH and organic matter of organic amendments.
The quality of bulk organic amendments for large-scale landscape uses can then be determined. The amendment you choose depends on your goals. Choose an amendment that decomposes rapidly. Choose an amendment that decomposes slowly. Choose a combination of amendments.