Noncomposted Municipal Solid Waste Byproduct Influences Soil and Plant Nutrients 5 Years After Soil Reclamation

Concerns for the mounting supply of municipal solid waste being generated combined with decreasing landfill space have compelled military installations to evaluate alternative methods for disposal. One approach to reduce landfilling is the use of a new garbage-processing technology that sterilizes and separates the waste into inorganic and organic components. Thus, a study was initiated to evaluate the effectiveness of using the organic component (Fluff ) as a soil amendment for reclamation of disturbed US Army training land. The Fluff material was initially incorporated (10Y20 cm) into a highly degraded sandy loam soil (fine-loamy, kaolinitic, thermic Typic Kandiudults) located in a borrow pit at Fort BenningMilitary Reservation, Georgia, in 2003. The Fluff was applied at rates of 0, 18, 36, 72, and 143Mg ha, and the soilwas seeded with native prairie grasses. Soil nutrient retention and plant uptake were evaluated to determine the soil-plant system’s sustainability after 5 years. An unseeded control was also evaluated as a comparison of natural recovery. Five years after reclamation, vegetation resulting from natural recovery in the unseeded control was sparse. Fluff addition increased pH, organic matter, and plant nutrient availability in the degraded soil, with the greatest improvements occurring at higher application rates. Soil productivity improvements resulted in greater plant biomass production. Generally, plant nutrient concentrations were not significantly impacted by Fluff addition. However, plant nutrient content was consistently higher with Fluff addition, which was attributed to increased biomass production. Plant nutrient uptakes of N, Ca, Mg, B, Mn, and Zn were within the reference range for grasses, whereas P and K concentrations were slightly deficient. An Fe and Cu concentration toxicity problem at the borrow site was alleviated with higher Fluff application rates, whereas the control and lower Fluff rates accumulated high levels of Fe and Cu within plant tissues. These results suggest that Fluff can be effectively used in land rehabilitation and revegetation practices to create a sustainable native grassland ecosystem.