1994 Biosolids/Day lily experiment
The Gulf Coast Waste Disposal Authority demonstrated a soil enhancement project using municipal wastewater biosolids. The sludge or biosolids was used only on non-food crop. Because biosolids contain organic material, inorganic material, and desirable forms of nitrogen, they supply nitrogen over long periods of time to crops. Wood chips and yard wastes deplete nitrogen, and sandy soils are deficient in organic material. Therefore, the biosolids served as a great soil enhancement.