FACTORS INFLUENCING DEHARDENING AND REHARDENING OF FORSYTHIA X INTERMEDIA STEMS

THE OBJECTIVES WERE: TO STUDY THE RELATIONSHIP OF DORMANCY TO DEHARDENING IN FORSYTHIA X INTERMEDIA ZABEL; TO STUDY ENVIRONMENTAL CONTROL OF DEHARDENING AND REHARDENING; TO MODIFY DEHARDENING WITH GROWTH REGULATORS. HARDINESS OF STEMS OF FORSYTHIA X INTERMEDIA ZABEL GROWING OUTDOORS WAS DETERMINED FROM MID-NOVEMBER 1970 TO EARLY 1971. AT DIFFERENT TIMES IN WINTER, STEM PIECES FROM PLANTS WERE SUBJECTED TO DIFFERENT TIME-TEMPERATURE COMBINATIONS TO STUDY TEMPERATURE REQUIRED FOR DEHARDENING AND REHARDENING. ONCE THE COLD REQUIREMENT OF DORMANCY HAD BEEN FULFILLED, THE TEMPERATURE AND EXPOSURE REQUIRED FOR SIGNIFICANT DEHARDENING DECREASED, REACHING A MINIMUM IN LATE WINTER. THE DAILY DURATION OF LOW TEMPERATUEE REQUIRED TO PREVENT DEHARDENING INCREASED AFTER DORMANCY WAS BROKEN, BUT WAS CONSTANT THROUGHOUT THE REMAINDER OF WINTER. STEMS FAILED TO REHARDEN BEYOND THE LEVEL OF HARDINESS FOUND FOLLOWING DEHARDENING, BUT BEFORE ANY EXPOSURE TO LOW TEMPERATURE. ATTEMPTS TO MODIFY DEHARDENING WITH GROWTH REGULATORS APPLIED IN THE FALL TO NON-HARDY PLANTS WERE UNSUCCESSFUL. /AUTHOR/

  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284
  • Authors:
    • Hamilton, D F
  • Publication Date: 1972-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 40 p.
  • Serial:
    • Issue Number: 4

Subject/Index Terms

Filing Info

  • Accession Number: 00205202
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 20 1972 12:00AM