NITROGEN AVAILABILITY TO WOODY PLANT SPECIES AS INFLUENCED BY NITROGEN FIXATION

BY THE ACETYLENE REDUCTION ASSAY, NODULES FROM ELEVEN TREE AND SHRUB SPECIES WERE FOUND TO BE ACTIVE. ACTIVITY WAS CLASSIFIED FROM POOR TO GOOD BY THE DARK TO BRIGHT NODULE COLOR. NITROGEN FIXATION WAS DETERMINED TO BE DEPENDENT ON TEMPERATURE. DESPITE THE PLANTS DROPPING THEIR LEAVES DUE TO COLD TEMPERATURE, NODULE ACTIVITY WAS ABLE TO CONTINUE AT A REDUCED RATE. A NURSE CROP OF NITROGEN-FIXING PLANTS DID NOT GIVE OFF NITROGEN THROUGH THE NODULES INTO THE ROOTING MEDIUM WHILE THE PLANT WAS ACTIVELY GROWING. THE INCREASE IN SOIL NITROGEN AROUND THESE PLANTS, THEREFORE, CAME FROM SOMEWHERE ELSE, SUCH AS DEAD AND DECOMPOSING NODULES OR FROM LEAF LITTER. IT WAS FOUND THAT NITROGEN-FIXING WOODY SPECIES ARE CAPABLE OF PROVIDING ADEQUATE NITROGEN FOR PLANT GROWTH. OVER A PERIOD OF TIME THEY WILL BUILD UP NITROGEN SUPPLIES WHERE GROWN ON NEWLY EXPOSED OR OTHERWISE LOW FERTILITY SOILS. IT WAS CONCLUDED THAT LANDSCAPE ARCHITECTS OR OTHER PLANT GROWERS SHOULD CONSIDER USING NITROGEN- FIXING PLANTS IN AREAS OF LOW SOIL FERTILITY AND AREAS NOT ACCESSIBLE TO FREQUENT OR ADEQUATE FERTILIZATION. /AUTHOR/

  • Supplemental Notes:
    • APP
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Mcniel, R E
    • Carpenter, P L
  • Publication Date: 1972-7-26

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 46 p.
  • Serial:
    • Issue Number: 13

Subject/Index Terms

Filing Info

  • Accession Number: 00205211
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 28 1972 12:00AM