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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 19th Southern Forest Tree Improvement Conference (1987) → Differences in Growth Rate and in Acceleration of Growth Rate Among Loblolly Pine Rangewide Seed Sources Confirmed

Differences in Growth Rate and in Acceleration of Growth Rate Among Loblolly Pine Rangewide Seed Sources Confirmed

Loblolly pine (Pinus teada L.) from 15 rangewide seed sources were planted in 15 widely separated plantations. Height growths at 3, 5, 10, 15, 20 and 25 years of age indicated that differences in growth rate and in acceleration of growth rate existed and should be useful for selection. The average growth rate for the study was 20 percent, but for the best seed sources (No. 329 and NO. 317), it was 25 percent per year. While seed sources No. 305 and No. 319 had fast growing rates only before age 15, seed source 321 was a slow starter, but had the best growth rate in the later years. Selection from fast growth rate would result in simultaneous selection for slow "incremental relative rate of relative growth rate".


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Author(s): Fan H. Kung

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1987