ABSTRACT
The effect of the pruning intensity on the production of Pinus elliottii Engelm. was studied in a randomized block design trial with 5 treatments and 3 repetitions. The treatments were: T1 - control, without pruning; T2 - pruning of the dead branches; T3 - pruning of 40% of the total height; T4 - pruning of 50% of the total height; and T5 - pruning of 60% of the total height. The diameter and wood volume were affected by the pruning intensity of the 11-year old stand. The control (263.5 m3/ha) and pruning of the dead branches (245.1 m3/ha) were different from all other treatments (pruning of 40% - 231.5 m3/ha; pruning of 50% - 225.5 m3/ha; and pruning of 60% - 211.6 m3/ha). The smallest production loss was 12% on the 40% pruning, and the greatest loss was 20% on the 60% pruning treatment. It is concluded that pruning intensities below 40% of the total height should be employed because of the lower production losses, and increases in diameter and quality of the wood.
Key words:
Pinus elliottii Engelm.; pruning; yield.