IMPROVEMENT CUTTINGS 



87 



is possible in an unthinned stand. In other words, thinnings 

 enable the forester to shorten the rotation in which a given 

 product is produced. This shortening may be as great as twenty- 

 five per cent. For example, if an unthinned stand of pure 



S9g^ 



By permission of the Connecticut State Forester. 

 35. — Portion of the same stand as shown in Fig. 33. Here 



Fig- 35- — Portion of the same stand as shown in Fig. 33. Here a heavy D grade thinning 

 was made and a large number of the trees were broiien off by the wind. The trees were 

 too slender for such a heavy thinning. 



chestnut is merchantable for ties in forty years, a similar stand 

 which has been properly thinned should have trees of the same 

 size in thirty years. 



Besides increasing the growth of the individual trees the total 

 yield of the stand is raised, by which is meant that in a single 

 rotation (or given number of years) more material is produced 



