One soil series, Hyanko covering 75% of the land and one soil complex,
Hyanko Rangamati with 50% occurrence of the Rangamati scries in the
remaining portion were recognized from a detailed soil survey of Hyanko Seed
Orchard Centre of BFRI and the adjoining 1976 teak plantation and mapped on
phase level. The Hyanko scries has been classified as Plinthic Palcustults and
the Rangamali scries as Typic Dystrochrcpts. Hyanko scries contains ironmanganese
nodules to the extent of 15% in the upper 100 cm. Although the
soil fertility is low, the planted gamar ramcis arc growing successfully and do
not show much variation in growth except on eroded phase. Similar land can
be utilized by introducing nitrogen fixing short rotation fuel wood species on
eroded phase and economically important timber trees on gently sloping to
moderately steep and smooth relief phases even without manuring