





THE TRER. PAs 
Very complete data on reproduction in the Coconino and Tusayan 
National Forests, gathered in the course of reconnaissance estimates, 
and shown graphically in figure 4, give an excellent idea of the aver- 
age quality and quantity of western yellow-pine reproduction on an 
area of 1,258,240 acres, where unfavorable conditions exist. Good 
reproduction means that seedlings already stock the ground; fair 
reproduction, that seedlings are scattered, but sufficient in places for 
a second crop; and poor reproduction, that new growth is entirely 
lacking or very incomplete. 
GROWTH. 
Under the climatic conditions of the Southwest western yellow 
pine is not a tree of rapid growth. It must, in fact, wage a continual 
warfare with nature for its very existence. The growing season is 
short, and frequently the seasonal drought lasts well into July, when 
the growing season is half over. In the seedling and sapling stage 
energy that must be 
expended in_ estab- 
G00D REPRODUCTION 
282,080 ACRES-22 of, 
FAIR REPRODUCTION 
I34880 ACRES-27 % 
lishing the tree’s root 
POOR REPRODUCTION 
system results in 
dwarfing its develop- 
458,400 ACRES. - 36 of, 
FARK LAND 
ment above ground. 
/82,880 ACRES/5-% 






HEIGHT GROWTH. 
The height growth 
of seedlings depends 
entirely upon local 
conditions, principally whether they are partially suppressed or grow 
in full light. The average figures in Table 6 are for seedlings grow- 
ing in the open with some side shade. 
Fic. 4.—Relative quality of reproduction on Coconino and 
Tusayan Forests. 
TABLE 6.—Height growth of seedlings. 




Colfax P 
Prescott | Apache Datil Jemez “ 
Age. oe Forest. | Forest. | Forest. | Forest. Average. 
Years Feet. Feet Feet. Feet Feet Feet 
[elena ORSP iBee eee: (RA Saral eee ce oe A gee lg Ops pee |e ea ee 
JE reauteh cme nme nite pl Ge Rericneese 55) LED Jil ate ere Gl eae cee 
Arties e, .9 67 .6 ie he | ses es even ceo | overt parents 
ein) Sand» ial 1.6 .8 12 0.5 1.04 
Greens 1.4 2.0 9 153 .8 1. 28 
(peers 5 07 2.6 1.0 1.4 1.2 1.58 
pal te ae 1.9 Sal ilo lt 1158) 1.6 1.80 
Ores ie 2.2 a 7 Ue, U7 1.9 2.14 
1K see era 2.4 4.3 1.33 1.9 728 2. 44 
Maliees 2a 4.9 1.4 Pi 2.8 2.78 
Heel 22 es = 3.0 5.6 1.6 ie, 38 3.14 
jee 3.4 6.4 1 e¢/ 74.83) 3.8 BL ay 
11d Lgiy sae 3.8 Tod 1.8 2.4 4.3 3. 92 
i eee 4.2 fst dL 2.0 Met) 4.8 4.32 




