ROTATION ESTABLISHMENT EXPERIMENT IN DRY ZONE OF SRI LANKA
K M A Bandara
Teak (Tectona grandis) is a tree species which grows well in the dry zone
of Sri Lanka. During 1960s and 70s nearly 40,000 hectares have been planted
with this species as commercial plantations in nutrients rich burnt soil
in the low country intermediate and dry zone areas. Most of the established
plantations are now in a stage to do the final felling. The micro environmental
conditions of the plantations has changed due to different environmental
changes such as frequent fire, nutrient removal by harvesting etc. Therefore
the second rotation establishment of the same species seem to be a problem.
A field experiment on the second rotation establishment was carried out
at Timbolkettiya, Embilipitiya in 1995. Two different propagule types,
three different land preparation methods and four different fertilizer
applications were applied in a split split plot design.
The propagule type potted stumps (p> 0.05) were far superior to the normal
bare rooted stumps in terms of survival percentage and plant's initial
growth after the second monsoon rains. In general deep soil loosening
(45 cm hole) had the highest survival (81%) and the fastest plant growth
(95 cm) compared to the standard 30 cm hole (58% survival and 72 cm height).
A significant difference (p > 0.05) was not observed between different
inorganic fertilizer levels. This could have been due to the adverse environmental
conditions which prevailed during the experimental period. The survival
for potted plants was 86% while it was only 42% for bare rooted stumps.
Further, the potted plants reached 95 cm height compared to 72 cm for
Department of Forestry and Environmental Science,
of Sri Jayewardenepura,Sri Lanka. 1999. All rights reserved.