Harriagton, Michael G. , and Rick G. Kelsey. 



1979. Influence of some environmental factors on initial establishment 

 and growth of ponderosa pine seedlings. USDA For. Serv. Res. 

 Pap. INT-230, 26 p. Intermt. For. and Range Exp. Stn. , Ogden, 

 Utah 84401. 



Plots representing various soil treatments were prepared under mature 

 ponderosa pines and in openings, were planted with ponderosa pine seeds, 

 and then observed durii^ the subsequent growing season. Germination, sur- 

 vival, and growth were superior on plots located in openings and on plots 

 wherein forest litter and competing vegetation had been removed or burned. 

 Cutworms, birds, and rodents caused the highest percentage of seedling 

 mortality. 



KEYWORDS: ponderosa pine, seed germination, seedling mortality, seedling 

 productivity. 



Harrington, Michael G., and Rick G. Kelsey. 



1979. Influence of some environmental factors on initial establishment 

 and growth of ponderosa pine seedlings. USDA For. Serv. Res. 

 Pap. INT-230, 26 p. Intermt. For. and Range Exp. Stn., Ogden, 

 Utah 84401. 



Plots representing various soil treatments were prepared under mature 

 ponderosa pines and in openings, were planted with ponderosa pine seeds, 

 and then observed during the subsequent growing season. Germination, sur- 

 vival, and growth were superior on plots located in openings and on plots 

 wherein forest Utter and competing vegetation had been removed or burned. 

 Cutworms, birds, and rodents caused the highest percentage of seedling 

 mortality. 



KEYWORDS: ponderosa pine, seed germination, seedUng mortality, seedling 

 productivity. 



