Abstract
Physiologically active substances were liberated by rooting willow cuttings and retained by the solution or sand media in which rooting had occurred. Subsequent rooting of willow cuttings in such media affected the number and particularly the length of roots. Stimulation of root growth on dormant cuttings occurred while the effects on non-dormant material were predominantly injurious. Stimulation or inhibition was related to the concentration of the liberated material. The active substance was thermostable and appeared to have effects similar to those of synthetic plant growth stimulants. It has been demonstrated that salicylates were not responsible for the activity.
Published Version
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