FOREST PLANTING. 17 



Spacing. The proper interval between planted trees depends 

 upon the habit of the species, the strength of the soil, the ex- 

 pected life of the plantation, etc. In this part of the country it 

 is most usual to space 6 ft. by 6 ft. in squares. Cottonwood should 

 have a little more room, locust a little less. The aim is to give 

 each tree room to develop a good-sized crown, yet not so much 

 that it will have big lower branches, or the plantation need 

 thinning before the stems are large enough to be salable. Straight 

 rows equally spaced, thus, 



O Q- O O O O O O 



6 -0 



O 



O 



O 



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Fig. 5. Diagram Illustrating Tree Planting in Squares. 



are better than "staggered" rows or triangular spacing, thus, 

 O Q- O O O O O O 



O 



O 



O 



O 



0000000 

 Fig. 6. Diagram Illustrating Tree Planting on Triangular Plan. 



because removals can be made more uniformly when the time 

 for thinning comes. Wider intervals between the rows than 

 within the rows are justified only when one element in a mixed 

 plantation is intended to be removed early. 



TREES PER ACRE AT VARIOUS SPACINGS. 

 3 feet x 3 feet 4840 trees 



