Abstract
ABSTRACT
A slow-release herbicide system was tested for its ability to act as a barrier to plant root growth into buried hazardous waste. A layer of trifluralin-releasing pellets, bonded to polypropylene fabric, was placed between topsoil and gravel drainage layer in 100 and 200 liter containers planted in bahiagrass, bamboo, or loblolly pine. After 3 years, sampling has revealed almost no growth of roots below the treated fabric. However, roots have grown closer to the barrier than expected, and rhizomes appear less affected than roots. The extent to which elevated soil temperatures in this study influenced effectiveness is uncertain, although longevity is likely to be reduced. Adequate soil depth over the fabric is important for good health of the cover vegetation.
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