One of the studies showed that MSWI fly ash, bottom ash and combined ash can influence plant growth in a positive manner. Growth of alfalfa and Swiss chard in ash-amended soils was similar than that in soils amended with phosphorous and potassium fertilizer, indicating that MSW ash can supply essential nutrients for plant growth. However, the high Mo concentrations and uptake of Cd was significant enough to raise concern if the plant tissue was to be ingested by cattle, sheep, and swine. Moreover, the high soluble salt content can cause problems with sensitive plants under high amounts of ash amendments