BULLETIN 741, U. S-. DEPARTMENT OF AGRICULTURE. 
grazed plots, of 14.6 per cent on moderately grazed areas, and of 4.4 
per cent on heavily grazed plots. The small percentage on the 
heavily grazed plots is due to the high mortality of specimens on 
these plots in previous seasons, which left for observation relatively 
few specimens having terminal shoots. Table 5 shows that for the 
whole period from 1912 to 1916, inclusive, the greatest number of 
grazed sprouts, especially those up 
to a foot or so in height, were in 
general found on heavily cropped 
plots, and that the least injuries 
occurred on the lightly grazed plots. 
When the total number of sprouts 
occurring on the plots and the 
number injured are considered col- 
lectively for the five years, regard- 
less of grazing intensity, a little less 
than half (40 per cent) is found to 
be injured by hrowsing. This is 
considerably lower than on the 
heavily grazed plots. On most 
plots the stature of the specimens 
was appreciably more reduced on 
the heavily grazed lands than on 
those where grazing was light or 
moderate, the portion of the speci- 
mens remaining often being mere 
snags, as is shown in figure 2 of 
Plate I and figures 1 and 2 of 
Plate II. In the most extreme 
cases all the leaves, much of the 
tender woody growth, some of the 
buds, and portions of the bark were 
eaten. 
The proportion of specimens with 
both leaders and laterals browsed 
is least serious on the lightly grazed 
plots. On moderately grazed areas 
the percentage is considerably more, 
and on heavily grazed areas it is the highest of all. This holds true 
both for 1915 and 1916. For the five-year period 1912-1916, Table 4 
shows that, regardless of height classes, the average percentage of 
injured sprouts is least on the lightly grazed plots, intermediate on the 
moderately grazed areas, and largest on the heavily grazed plots, the 
figures being 14.1, 24.9, and 53.1, respectively. The results are similar 
20% 
10% 
0% 
/0% 
0% 
60% 
407c 
207 c 
607 e 
407. 
207c 
1916 
13 IS 
1315 
1916 
1916 
1915 
/S/6 
/9/S 
^ «^*" 
^"^ ,"'' 
y '"*<< 
N. 
/ 
/ 
* - •»- 
^rv_— :rmz 
LightlyGrszed Mode.rzre.ly Grazed Heavi'/y Grazed 
==r Leader S Laterals Browsed 
ZZZZZ-Zl Leader Browsed 
ZZZIZZZZI Una razed 
Toial Mortality 
Fig. 1.— Relation of injury of sprouts to intensity 
of grazing seasons 1915 and 1916. 
