TECHNIQUES TO INCREASE SURVIVAL OF NEW HIGHWAY PLANTINGS (ROOT REGENERATION PORTION). FINAL REPORT
Root regeneration in several species of plants was enhanced by a five minute preplant root soak in from 1,000 to 3,000 mg/liter aqueous solutions of indolebutyric acid (IBA). Positive responses were confined to coarse rooted difficult-to-transplant species such as tulip tree, red oak, black walnut, white oak, black tupelo and redbud. Fibrous rooted species such as silver maple and sugar maple did not respond to the auxin treatment and two species of pine were adversely affected. Root soaks were the most effective technique utilized to apply auxin. Tulip tree (Liriodendron tulipifera L) was selected as a model system for in depth studies on root regeneration under controlled conditions as well as field sites. Root regeneration was greater in the spring than in the fall but was not affected by photoperiod. There was a strong interaction between root regeneration and subsequent shoot growth. Plant survival following transplanting in the field was enhanced in IBA treated plants compared to untreated plants. Root regeneration and subsequent shoot growth was influenced by soil temperature with little growth occurring below ten degrees C. IBA accelerated root regeneration only when soil temperature was above 21 degrees C. Carbohydrate reserves (primarily starch) in the taproot were depleted as new roots formed. This depletion was accelerated by IBA treatment and reached critically low levels at the highest concentrations of IBA used.
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- This research was conducted in cooperation with the Federal Highway Administration as a portion of HPR Part II Study titled, "Techniques to Increase Survival of New Highway Plantings". Report revised March 1984 and June 1985.
Joint Highway Research ProjectCivil Engineering Building, Purdue University
West Lafayette, Indiana, United States 47907
Washington, DC United States 20590
- Moser, B C
- Kelly, R J
- Publication Date: 1982-12
- Features: Figures; Tables;
- Pagination: 52 p.
- TRT Terms: Planting; Regenerators; Roots; Temperature; Trees; Vegetation
- Uncontrolled Terms: Regeneration
- Old TRIS Terms: Indolebutyric acid; Roots, plants
- Subject Areas: Design; Environment; Geotechnology; Highways; Maintenance and Preservation; Planning and Forecasting; I21: Planning of Transport Infrastructure;
- Accession Number: 00457554
- Record Type: Publication
- Report/Paper Numbers: FHWA/IN/JHRP-82-22
- Contract Numbers: HPR-1(21), Part II
- Files: ITRD, TRIS, ATRI, USDOT, STATEDOT
- Created Date: Aug 31 1987 12:00AM