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USE OF ALKALINE STABILIZED BIOSOLIDS AS AN AGRICULTURAL LIMING AGENT

achieve a Class A Product. Application of biosolids to agricultural land is the predominant method of disposal. Due to low nitrogen concentrations and high calcium carbonate equivalence (CCE), application rates need to be based on the neutralizing capacities of the materials. This research compared alkaline stabilized biosolid (ASB) with a standard agricultural dolomitic lime to determine the chemical properties of the ASB, reaction rates of the material, how long these reactions would continue, and how plant nutrition may be affected. Three types of experiments were initiated: incubation, greenhouse, and field. Soils selected for studies contained a range in clay and organic matter content. The ASB neutralized soil acidity as well as the agricultural lime at the same CCE application rates. ASB reacted more quickly than agricultural lime in the greenhouse and field studies. This was due to the finer particle size of the ASB. The ASB was able to supply more calcium, but considerably less magnesium, than agricultural lime. The deficiency of magnesium will be of concern when ASB is applied on soils that are naturally deficient in magnesium. A number of utilities are implementing alkaline stabilization systems for biosolids to