9A 



BULLETIN 1264, U. S. DEPARTMENT OF AGRICULTURE. 



Two-year-old seedlings are, in most cases, too small to transplant 

 satisfactorily. The 2-2 age class has been used extensively in field 

 planting with the 2-1 class a fairly close second. The 2-1 class was 

 found to be too small for general field use, and it will be seen from 

 Table 12 that this age class has not always succeeded so well as larger- 

 sized stock. 



Transplants remaining in the transplant bed a second year were 

 frequently subject to severe frost injury the second spring, owing 

 to retarded growth caused by transplanting and a correspondingly 



3-0 



Fir,. 4.— Development of Douglas fir stock of different age classes grown at the Cottonwood Nursery, 

 Wasatch National Forest, Utah. The 2-2 and 3-2 stock was injured by at least two late spring frosts, 

 while the 3-0 and 3-1 stock was uninjured, having been protected from frosts and snow-moulding fungi. 



earlier start the second season. Three-year old seedlings are suffi- 

 ciently large for transplanting (see fig. 4), and with one additional 

 year's growth in the transplant bed make a very satisfactory class of 

 planting stock. In the spring of 1919, it was possible to make a 

 direct comparison of 3-1 and 3-2 stock planted under a moderate 

 cover of aspen. Table 12 shows that in this instance the use of 3-1 

 stock resulted in a survival of 80 per cent as compared with a survival 

 of 40 per cent for the 3-2 stock at the end of the second growing 

 season. 



