Figure 2. — Soil depth and seedling 

 damage percent (1968) hy areas 

 and treatments. 



S 10 20 



SOIL DEPTH (INCHES) 



Treatment differences were not apparent in seedling heights. The average heights 

 for 1966 and 1968, for seedlings alive in 1968, were: 



Soil depth 

 - - - (Inches) - - - - 



8-26 20-40 



Normal seedling height 



_ -(Feet) 



1966 0.83 1.01 



1968 1.24 1.72 



Damaged seedling height 



-(Feet)- - - - 



1966 0.77 0.94 



1968 1.10 1.44 



Average annual height growth (1966 to 1968) for normal seedlings on the shallow soil 

 was 0.20 foot per year; on the deeper soil (Area 2), it was 0.30 foot per year. 



Test 2: Burned Spots and 2-, 4- and 6-Foot Scalps 

 on Two Aspects, 1962 



In 1961 some ponderosa pine seedlings had been planted on bumed-out slash piles. 

 Random field observations suggested that better survival and growth occurred on these 

 bums. Thus, it was assumed that an alternative, a scalped planting site, would hold 

 promise for a similar reduction in competition. 



5 



