SOIIv MOISTURE AND HEIGHT GROWTH 



753 



The result of the observations showed that: (1) Yellow pine is 

 making its most rapid upward growth at about the 'age of 30 years, at 

 which age it has reached a diameter of 4 inches or slightly more under 

 reasonably close spacing. (2) Moderately close spacing of seedlings 

 is required to force this desirable upward growth. (3) Even extreme 

 crowding in early youth is preferable to too open spacing, as the 

 crowded condition tends to upward growth, and eventually regulates 

 itself. (4) Where reproduction is lacking, provision should be made 

 at time of cutting for abundant reseeding. 



Average age, 

 years 



Average 

 height, leet 



Minimum 



growth in 



height, 



inches 



Alaximv.m 



growth in 



height, 



inches 



Average 



jrowth in 



height, 



4.4 

 4.9 

 5.2 

 5.8 

 6.3 

 6.9 

 7.5 

 8.3 

 9.0 

 9.7 

 10.4 

 12.3 



4 



3.5 



2.5 



5.0 



4.0 



3.5 



5.0 



6.0 



6.0 



4.0 



4.5 



9.0 



10.0 



8.0 



6.5 



8.5 



10.0 



9.0 



17.0 



13.0 



11.0 



12.0 



12.0 



25.0 



6.75 

 5.25 

 5.00 

 6.50 

 6.25 

 6.50 

 8.00 

 9.87 

 9.25 

 7.01 

 9.25 

 19.00 



