MULCH TRIALS-A SPECIAL STUDY OF SELECTION, ESTABLISHMENT, AND MAINTENANCE OF VEGETATION FOR EROSION CONTROL OF ROADSIDE AREAS IN GEORGIA

A continuing search for effective, economical materials to be used as mulch for newly seeded highway roadsides led to trials with cypress bark, two latex binders, and two formulations of gypsum. All of these materials were placed in trials adjacent to areas mulched with 2 tons of common grass, hay or straw. Cypress bark proved to be vary durable material but plant stands were reduced or eliminated where it was used. Tannic acid is suspected to be the material causing plant suppression. Both latex binders were effective for erosion control with or without added straw mulch. Only 16 plots were mulched with the latex and all were in the southern part of the state. The earlier gypsum (calcium sulfate dihydrate) material seemed to be better suited as a mulch material than the later formulation including a pigment and aluminum sulfate. Plant establishment with the earlier gypsum formulation was 45 to 60 days later than adjacent plots mulched with straw, whether seeded in the spring or the fall. Only on prepared sites were satisfactory stands finally obtained. All trials with gypsum mulch materials on unprepared locations were total failures. The later gypsum formulation, Erocom, used in September 1972, did not protect back-slopes from erosion and plant seedling stands never did reach satisfactory levels. The conclusion is that neither cypress bark nor gypsum are satisfactory mulches. Latexes seem to be promising but more tests are needed before wide-spread adoption can be recommended. /FHWA/

  • Corporate Authors:

    University of Georgia, Athens

    College of Business Administration
    Athens, GA  United States  30602

    Georgia Department of Transportation

    One Georgia Center
    600 West Peachtree Street, NW
    Atlanta, GA  United States  30308
  • Authors:
    • McCreery, R A
    • Diseker, E G
    • Lawrence Jr, R M
  • Publication Date: 1975-3

Media Info

  • Pagination: 23 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00126485
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Spec. Rpt.
  • Contract Numbers: GDOT Res Proj 6907
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Dec 16 1975 12:00AM