Abstract:

Variation in growth characteristics of Pinus caribaea var. hondurensis (PCH) has been reported
across the major pine growing areas of Uganda. We assessed the growth performance of PCH from
July 2012 to August 2013 in order to generate information needed to guide future interventions
for improved pine management in the country. Growth parameters of 5-year-old PCH plantations
were assessed in terms of height, diameter at breast height (DBH) and foxtailing in six districts.
Data were analysed in the R statistical environment (version 3.1.1). Results showed that the pine
trees registered good growth rates in Gulu and Mubende districts and poor growth rates in
Nakasongola District. In Gulu and Mubende districts, the mean DBH was 17.29 cm and 14.44 cm,
respectively, while the corresponding mean height was 12.39 m and 11.38 m. Growth of the pine
trees in Nakasongola District was substantially slower, with mean DBH of 9.89 cm and mean
height of 9.01 m. These growth rates correspond to mean annual increments (over bark) of
between 15 and 19 m3
ha-1 y-1 on sites in Gulu and Mubende districts and 4.6 m3
ha-1 y-1 on sites in
Nakasongola district. The percentage of foxtailing in all the study districts was 7.1. We recommend
a longer time study of about 20 years to the age when the trees are expected to achieve full
maturity. This will provide a more elaborate understanding of the influence of site and stand
factors on growth performance of PCH in Uganda.