YIELD OF Pinus taeda L. IN THINNED STAND IN THE CAMPOS DE CIMA DA SERRA REGION, RIO GRANDE DO SUL.

<p>This work was carried out with the objective of studying the yield<strong> </strong>of <em>Pinus</em> <em>taeda</em> L., planted in an initial spacing of 3 x 2 m, located in Canela, Rio Grande do Sul state. The amostral population was submitted to one and two selective thinning, beyond a control sample, without thinning. The selective low thinning was conducted with reduction of the basal area to levels of 28 m²/ha. At age 17, the total yield<strong> </strong>of the control sample, without thinning, was 886.3 m³ha^-1; with one thinning at age 11 the yield was 756.6 m³ha^-1, resulting in losses of yield<strong> </strong>of<strong> </strong>14.6% compared to the control; with two selective at ages 11 and 15, the yield was 732.9 m³ha^-1, resulting in losses of yield<strong> </strong>in relation with the control sample, without thinning, of 17.3%. The selective thinning allowed a significant gain in diameter, up to age 17, with the execution of a selective thinning at age 11 an average diameter of 33.4 cm; with two selective thinning at ages 11 and 15 an average diameter of 33.5 cm; and an average diameter of 24.3 cm in the control sample, without thinning.