THE ESTABLISHMENT OF VEGETATION ON HIGHWAY SLOPES WITHOUT THE USE OF TOPSOIL

VARIOUS FACTORS OF EROSION CONTROL AND VEGETATION ESTABLISHMENT WERE STUDIED OVER A FOUR YEAR PERIOD IN WASHINGTON. THEY WERE: (1) ESTABLISHMENT OF GRASS/LEGUME COVER WITHOUT THE USE OF TOPSOIL, (2) SPECIES OF GRASSES AND CLOVER AND PROPORTION OF EACH, (3) MULCHING MATERIALS AND (4) FERTILIZATIONS. IT WAS FOUND THAT EROSION CONTROL VEGETATION CAN BE ESTABLISHED ON SUBSOILS WITHOUT TOPSOIL. NO DIFFERENCES WERE FOUND AMONG GENERAL AND SPECIES OF SEED TESTED. SUBSOILS, AS EXPOSED FROM CONSTRUCTION, SUPPORTED GOOD STANDS OF GRASS PROVIDED ADEQUATE FERTILIZERS WERE SUPPLIED AND THEY WERE GIVEN PROPER PROTECTION (MULCHING) FROM EROSION. ON ERODIBLE SITES ON 2:1 SLOPES OR STEEPER, THAT EXCELSIOR MATTING OR STRAW TACKED WITH ASPHALT EMULSION WERE SUPERIOR TO ALL OTHER MATERIALS TESTED. REFERTILIZATION WAS IMPORTANT. /AUTHOR/

  • Corporate Authors:

    Washington State University, Pullman

    Department of Civil and Environmental Engineering
    P.O. Box 642910
    Pullman, WA  USA  99164-2910

    Washington State Department of Highways

    Olympia, WA  USA 

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Goss, R L
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00204630
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: Y-1009
  • Files: TRIS, STATEDOT
  • Created Date: Sep 28 1970 12:00AM