26 
BULLETIN 149 7, U. S. DEPARTMENT OF AGRICULTURE 
brush competition is heavy and plowing most difficult. Another 
comparison may be made of two well-established plantations on an 
upland sandy soil, alike in all respects except that the trees in one 
were planted in slits in furrows and in the other by the slit method 
without furrows. Of those planted in furrows 74 per cent of the 
jack pine and 72 per cent of the Norway pine survived, whereas of 
those from the unfurrowed planting only 21 per cent of each of 
the species remained alive. 
On the better, sandy sites, underplantecl northern white pine had 
an average annual height growth of 0.23 foot by the slit method 
NORWAY PINE 
WHITE PINE 
■ 
" 
" T 
■■\ 
?: 
-3 r 
+ 
±4 
^4 2- 
r 
~-2_ 

+3 
1 
1 
1 I 
HOLE SLIT 
METHOD OF PLANTING 
Figure 3. — Relative success of plantations by different methods of planting. 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 
and 0.42 foot by the hole method. On the other hand, the per- 
centage of living trees was 58 by the slit method and 39 by the 
hole method, a poor showing which was probably due in part to 
other causes. Norway pine on the sandy soils grew at an aver- 
age rate of 0.2 foot when planted by the slit method, 0.27 foot 
by the slit-furrow method, and 0.32 foot by the hole method. The 
percentages of living trees by the three methods were 40, 58, and 
60, respectively. The advantages of the hole and furrow methods 
in increased growth and survival although real are small. (Fig. 
3.) In more recent plantations, efficiently planted by any of these 
methods with the technic developed from earlier experience, 80 
per cent or more of the planted trees have lived. 
