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GROWTH RATES, STEM FORM AND BRANCHING CHARACTERISTICS OF FIVE PROVENANCES OF P. KHASYA GROWN UNDER PLANTATION CONDITIONS IN N. RHODESIA

C. J. A. SHELBOURNE
The Commonwealth Forestry Review
Vol. 42, No. 4 (114) (December 1963), pp. 334-346
Stable URL: http://www.jstor.org/stable/42603454
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
GROWTH RATES, STEM FORM AND BRANCHING CHARACTERISTICS OF FIVE PROVENANCES OF P. KHASYA GROWN UNDER PLANTATION CONDITIONS IN N. RHODESIA
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Abstract

A little known tropical pine species, P. khasya, forms the main species in a plantation programme in Northern Rhodesia. Trial plantings of various provenances of this pine have been made in the territory since 1937. A comparative study was made of growth rates at six different stations throughout Northern Rhodesia, and of stem form, branching characteristics and crown shape at two different stations, and timber properties at one station. It was apparent that P. khasya 'Assam' and 'Burma' were much inferior in growth rates to P. khasya 'Benguef' (Philippines), 'Dalat' (S. Viet Nam) and 'Madagascar' (originally somewhere in Indo-China). 'Benguet', 'Assam' and 'Burma' were inferior in stem form to 'Dalat' and 'Madagascar', 'Madagascar' being by far the best. 'Assam' and 'Burma' had the worst branching characteristics, while 'Benguef was slightly better than 'Dalat' and 'Madagascar' for these. 'Assam' had the biggest and most wide-conical crowns. Timber properties of 'Benguef' and 'Assam' were superior to P. patula, and 'Benguef' was, for its density, as good as "Oregon" (Pseudotsuga taxifolia). 'Assam' did not grade as a structural timber because of its branching characteristics (knots). Some tentative conclusions are drawn concerning relationships between provenances and their geographical distribution, based on the characteristics examined.

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