INVESTIGATIONS IN WHITE PINE PLANTATIONS. 



15 



in height from 12 to 19 feet. Division III represents trees which have 

 been unaffected by damaging influences. It contains 5 per cent of the 

 trees, and they have made an average height growth of from 1.5 to 2 

 feet, and diameter growth of 0.36 to 0.42 inch per year. 



The soil is sandy, but is gradually improving in its condition. The 

 trees still retain all their lower branches, which are quite large, owing 

 to the rather wide spacing (8 by 8 feet). Seed production has begun, 

 but as yet has been light. 



TABLE 2. Growth of planted white pine, East Greenwich, R. 7. 

 PLANTATION OF H. G. RUSSELL. 

 [Based on 793 trees 15 years planted.] 



TABLE 3. Growth of planted red pine, East Greenwich, R. I. 

 PLANTATION OF H. G. RUSSELL. 

 [Based on 142 trees 15 years planted.] 



Tables 2 and 3 represent white and red pine in planted groves of 

 the same age and under similar soil and climatic conditions. The 

 height classes range regularly from 11 to 25 feet in the white pine 

 and from 12 to 25 in the red. However, 90 per cent of the white pine 

 has been affected by the weevil, and not less than 2 feet and in some 



