FOREST PLANTING IN THE LAKE STATES 
21 
quent exceptions, and that they are Jikety to be obscured or even 
reversed in individual plantings by the action of other facts which 
are more important. In height growth, for example, the Norway 
pine plantations on the open, samfy soils show almost the same aver- 
age height growth for 2-0, 1-1, 3-0, and 2-1 stock. The 2-2 stock 
averages only 1 to 2 feet higher 10 years after planting. If 2-0 seed- 
lings had been set out two years earlier, they would probably be 
as tall as the 2-2 stock is now. On the contrary, the height growth 
of 2-0 northern white pine underplanted is distinctly better than 
that of 3-0, 4—0, or 2-2 stock. Measurements of heights of different 
1.2 
O II 
RED PINE 
WHITE PINE 
to 
r 
X 
§ 
to 
5 o 
' r 
TT 
' 
1 
! 
T " 
■2 
:: 
: n 
1., 
.0 
f 
1 :: 
■A- 
if 
I 
2 
— 
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17 
l—l 
2-2 4-0 1-0 
CLASS OF STOCK 
2-0 3-0 
Figure 2. — Relative success of different classes of nursery stock. Wide bar marks 
average of all plots ; single plots that attain more than the average are notched 
on narrow bar, numerals indicating two or more plots of the same height 
classes of stock of Norway pine on the Michigan National Forest 
five years after planting, showed 15 inches for 1-0 seedlings, 20 
inches for 2-0, 21 inches for 1-1 transplants, and 27 inches for 2-1. 
These differences in height, however, will undoubtedly become in- 
significant long before the trees are mature. 
The effect of the class of planting stock on the percentage of trees 
which live is more significant than its influence on growth. Planta- 
tions of 2-2 Norway pine on the open sandy soils have from 60 to 
75 per cent of the trees living on the average, as compared with 
50 per cent in the 2-0 plantings. The corresponding averages for 
northern white pine underplantings are 54 per cent and 46 per cent. 
The Norway pine plantations of 1-1, 3-0, and 2-1 stock on the jack 
