growth-promoting rhizobacteria (PGPR), could also contribute to promoting plant
growth (Figs. 7.22 and 7.23).
Specifically, for Shorea balangeran, the average total height growth of trees in
the treatment plots was almost twice as high as that of the control plots. After
6 months of treatment, the average total height growth in the treatment plots was
Aerial Roots
on Stem
Lateral Roots
inside the
media
AeroHydro media
Fig. 7.21 Emergence of aerial roots after 2 months of treatment
Control
Treatment
4-5
new fronds
No
new frond
Control
Treatment
13-21
new leaves
2-9
new leaves
Oil Palm
Shorea balangeran
Fig. 7.22 New fronds growing on an oil palm, and new leaves growing on Shorea balangeran
based on observations on six trees
7 Principles of AeroHydro Culture
277