Growth and yields of Pinus oocarpa Schiede in some parts of northern Nigeria
Growth and yields of Pinus oocarpa Schiede in some parts of northern Nigeria
J. O. Adegbehin
ABSTRACT
Trial plantings of exotic tree species commenced in some parts of northern Nigeria over 40 years ago. Based on data from permanent sample and temporary plots, site index curves and yield tables were constructed for Pinus oocarpa, one of the promising exotics tried. The constructed site index curves revealed five (5) site classes at a reference age of 20 years; viz: I (24.9m); II (22.5m); III (20.1m); IV (17.7m) and V (15.3m). The growth figures derived from the yield classes resulting from the five site index classes revealed that the maximum current annual increment (MCAI) was attained between the ages of 9.3 - 13.7 years with a total volume production (TVP) of between 88 - 208 m3/ha (volume over-bark to 7.5 cm diameter top). The maximum mean annual increment (MMAI) was attained at age 16-20 years for the five classes, with a TVP of about 442 m3 /ha for class I; 374 m 3/ha for class II; 290 m3 /ha for class III; 209 m7ha for class IV and 153 m3 /ha for class V. Among other things discussed was the application of the resulting growth figures in the management of the species.
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March 2002
Vol. 52, Iss. 1
