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Organic waste amendments have the potential to influence the amount and chemical composition of surface aggregates within a soil. Organic waste amendment-induced changes in soil aggregate stability and chemical concentrations have potential to not only directly affect localized flora and fauna, but can also indirectly affect human health by impacting the transport of nutrients to surface and groundwater. Soil samples were collected from long-term research experiments located at the Oklahoma Panhandle Research and Extension Center receiving annual, spring applications of 0, 168 and 504 kg N ha−1 of beef manure, swine effluent, or anhydrous ammonia applications under conventionally-tilled, continuous corn (Zea mays L.). Aggregates one to two mm in diameter were collected and separated into stable and non-stable fractions and both fractions were analyzed for total phosphorus, potassium, copper, zinc and boron concentrations using ICAP-AES. Results showed swine effluent and anhydrous ammonia applications significantly decreased aggregate stability as compared to the control. In addition, potassium and boron were found in higher concentrations in the non-stable aggregates verses stable aggregates within the control and plots receiving 168 kg N ha−1 beef manure and 168 kg N ha−1 anhydrous ammonia.

Effect of Animal Waste Amendments on the Chemical Composition of Surface Stable and Non-Stable Aggregates in a Cultivated, Calcareous Silt Loam