Table 2 Average number of new lateral roots per treated root of spring dug and treated bareroot trees (150 cm tall).
Treatment1Species
Sugar mapleGlenleven lindenRed oak
Control11a26d  3b
IBA24a  22abc13a
IBA Na salt20a  56a     
IBA + B-naphtol13a  30abcd14a
IA + phloroglucinol18a  32ab   18a
IBA + nictonic acid9bcd   
NAA11a  6cd    7ab
  • 1 B-naphtol (1 × 10–6M); phloroglucinol (1 × 10–3M); nicotinic acid (1 × 10–3M); all IBA solutions at 3000 ppm.

  • 2 1s column mean separation, 5% level.