46 Forest Club Annual 



dent advantage in favor of 6x6 foot spacing for Ash in this kind 

 of soil and under these growing conditions. 



The Catalpa in Sub-lot 2 with the 6x6 foot spacing show 

 an average height growth 96 per cent of the height growth of 

 the trees in Sub-lot 4 with the 4x4 foot spacing. The average 

 D. B. H. of the trees in Sub-lot 2 is 133 per cent while the aver- 

 age diameter 1.5 feet from the ground is 140 per cent of the 

 respective average diameters of the trees in Sub-lot 4. 



The trees in Sub-lot 6 were cut back the second year. The 

 average height growth of the trees in this plot is 94 per cent of 

 the height growth of the trees in Sub-lot 2. The average D. B. H. 

 is 89 per cent and the diameter 1.5 feet from the ground is 80 

 per cent of the respective diameters of the trees in Sub-lot 2. 

 The greater growth of the trees which were not cut back would 

 tend to cause one to recommend leaving the young trees without 

 cutting them back. The trees which were cut back, however, 

 are less branched, have fewer forks and the boles are straighter 

 and more cylindrical than are the trees which have not been cut 

 back. It is very probable that the trees which were cut back will, 

 in a few years, overcome the lead which the other trees show 

 at the present time and that this will prove to be the better 

 method of handling the Catalpa. 



As to the result of spacing upon the growth of the trees 

 which were cut back, the trees in Sub-lot 6 with 6x6 foot spac- 

 ing show an average height growth 89 per cent of that of Sub-lot 

 5 with 4x4 foot spacing. The average D. B. H. of the trees in 

 Sub-lot 6 is 107 per cent of that in Sub-lot 5 while the average 

 diameter 1.5 feet from the ground is the same in each Sub-lot. 

 This would indicate that at the present time there is a consid- 

 erable difference in the rate of height growth of trees when 

 planted 4 and 6 feet apart and which have been cut back. 



The trees in Sub-lot 5 with a 4x4 foot spacing and which 

 were cut back at the end of the second year show a greater 

 height growth than do those of any of the other Catalpa experi- 

 ments. Sub-lot 4 with the same spacing distance shows the next 

 highest growth. This would indicate that 4x4 foot spacing is 

 better than 6x6 foot spacing for Catalpa, both when the trees 

 are cut back and when they are allowed to grow without being 

 cut back. 



The Honey Locust in Sub-lot 9 with a 4x4 foot spacing 

 show an average height growth 93 per cent of the height growtli 

 of the trees in Sub-lot 7 with 6x6 foot spacing. The average 



