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A polypropylene fabric containing control-release pellets of the herbicide, trifluralin, can be oriented in the soil to regulate the distribution of plant roots. In 1990, trenches were dug near 10-year-old red oak ( Quercus rubra L.) and 10- year-old yellow poplar (Liriodendron tulipifera L.) and fabric containing trifluralin control-release pellets and polypro- pylene fabric alone were installed vertically to redirect root growth. Roots grew alongside trifluralin fabric and fabric alone and did not penetrate either fabric 38 months after installation. Shoot growth of yellow poplar was reduced about 47% each year by the trifluralin fabric treatment compared to control. Red oak shoot growth was not affected by trifluralin fabric. Leaf water potential was not affected by treatment in either species. Trifluralin residues in trifluralin fabric decreased from 23.3% to 22.0% from July 1990 to October 1993. During this time, trifluralin levels increased from 0.4 to 3.6 mg·kg -1 in soil sampled 0 to 15 cm below trifluralin fabric. These results suggest that controlled-release trifluralin will provide persistent inhibition of root and shoot growth of some species and will not migrate significantly in the soil. Chemical names used: α,α,α-trifluoro-2,6-dinitro-N-N-dipropyl-p-toluidine (trifluralin). bamboo (Phyllostachys rubromarginata ) and bahiagrass (Paspalum notatum Fluegge) grew around trifluralin fabric 2 years after installation (Dosskey, 1991). In that study, loblolly pine ( Pinus taeda L.) roots penetrated the trifluralin fabric. Most experiments with trifluralin fabric have been conducted with plants in pots over a short time; therefore, knowledge of the response of established trees to trifluralin fabric is necessary to determine long-term effects. Trifluralin fabric installation requires digging a trench close to a tree trunk; however, the trenching and subsequent root inhibition may alter the function of a tree root and affect tree shoot growth. Dosskey et al. (1991) found reduced foliar N, Ca, and Mg in plants whose roots were exposed to trifluralin fabric. Water uptake is a crucial function of plant roots; but no reports on the effect of trifluralin fabric on plant water status are available. This experiment was conducted to elucidate the effects of trifluralin fabric on well-established trees during 3 years. The objectives were to 1) determine the inhibitory effect of trifluralin fabric on root and shoot growth; 2) evaluate the water status of trees whose roots were exposed to trifluralin fabric; and 3) determine the longevity of the effect of trifluralin fabric on selected trees and trifluralin movement through the soil over time.

Growth Regulatory Effects and Soil Concentration of Controlled-release Trifluralin Applied to Roots of Yellow poplar and Red Oak