134 . SILVICULTURAL TREATMENT 



for another cut. Frequent and light thinnings are far better than 

 heavy thinnings with long intervals. 



9. Do not let the best trees develop into "wolf trees"; keep suffi- 

 cient "trainers" to prevent this. 



10. Know the silvicultural and economic properties of the species 

 and the quality of the site before starting to thin. 



Some of the best opportunities for thinning exist in plantations 

 that have crowded canopies, especially in stands of 15 to 40 years 

 of age. 



