Feb. i, 1925 Sowing and Planting Season for Western Yellow Pine 249 
Table V. —Condition of 2-0 western yellow pine plantations during 1918 expressed 
in percentage of total number planted (600 each lot each season) 
PLANTED OCTOBER 20,1917 
Date of examination 
Condition of the plants 
June 1 
June 17 
July 8 
July 31 
Sept. 20 
Fall 
sown 
Spring 
sown 
Fall 
sown 
Spring 
sown 
Fall 
sown 
Spring 
sown 
Fall 
sown 
Spring 
sown 
Fall 
sown 
Spring 
sown 
Vigorous. 
Failing___ 
Dead.... 
Miscellaneous—unthrifty ® 
Total.. 
37.7 
23.3 
9.1 
29.9 
62.5 
8.0 
4.0 
25.5 
38.2 
17.1 
22.4 
22.3 
62.5 
7.2 
12.1 
18.2 
16.0 
2.9 
48.9 
32.2 
34.5 
1.3 
30.5 
33.7 
12.5 
1.5 
68.2 
17.8 
25.5 
.5 
52.4 
21.6 
14.1 
1.2 
74.8 
9.9 
24.6 
.5 
58.9 
16.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
PLANTED APRIL 20, 1917 
Vigorous. 
91.6 
90.8 
89.6 
90.1 
50.9 
51.7 
37.4 
37.3 
36.3 
32.6 
Failing...... 
2.7 
1.8 
1.5 
2.2 
.7 
.5 
.7 
0 
.3 
0 
Dead. 
.7 
.7 
2.5 
2.3 
16.0 
18.9 
46.4 
48.2 
51.6 
53.0 
Miscellaneous—unthrifty® 
5.0 
6.7 
6.4 
5.4 
32.4 
28.9 
15.5 
14.5 
11.8 
14.4 
Total.. 
100.0 
100.0 
100.0 
i 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
“These percentages cover totals derived from nine additional plants classes which are not reported in 
detail here because none of them individually show any significant contrast between the behavior of spring 
and fall sown stock. m 
At the end of the first season in the 
field (September 20) following fall plant¬ 
ing there were, based on fall sowing, 
(1) 174 per cent, or three-fourths more 
vigorous plants in the lot derived from 
spring sowing; (2) 42 per cent, or less 
than half as many failing plants 
among the spring sown; (3) 79 per 
cent, or four-fifths as many spring- 
sown plants dead as fall sown; and, 
on the other hand, (4) 162 per cent, 
or nearly two-thirds more plants un¬ 
thrifty in different ways in the spring- 
sown lot. This last class, however, 
contains many plants with but slight 
symptoms of disorder, from which, as 
is indicated by the 1919 records, most 
of them recovered. Table V shows 
that these tendencies were discernible, 
for the most part, as early as June 1. 
Injury or death by accident or animal 
enemies was found to be small and 
nearly equal in the two lots, hence 
it does not affect the comparisons. 
The second half of Table V shows 
the results of spring planting as they 
appear during the first growing season. 
Taken as a whole, there is very little 
difference between the lots from spring 
and fall sown seed. Both, but par¬ 
ticularly the fall sown, have done 
better than when fall planted. 
Figure 2 shows graphically the sur¬ 
vival in these plantations during 1918. 
The steeper the curve, the more favor¬ 
able the water relations, which were 
evidently at their worst during July. 
The flattening of the curves at the 
beginning and end of the season shows 
the presence of more moisture. 
During 1918, also, the current 
height growth of the season was 
measured on all thrifty plants. It 
was as follows: 
Fall planted, fall sown, 74 plants Incl1 
average_0. 66 
Fall planted, spring sown, 125 
plants average. __ . 83 
Spring planted, fall sown, 170 
plants average_ . 76 
Spring planted, spring sown, 170 
plants average_ . 80 
The spring-sown plants lead the fall 
sown in both cases, and this lead was 
greater in the case of fall planting. 
There was more irregularity in the 
spring-sown lot, due, undoubtedly, to 
the variation in germination dates 
following spring sowing. 
In 1919 a simpler plant classification 
was used for these plantations. (See 
Table VI.) Again basing percentages 
upon the results of fall sowing, it may 
be seen that: (1) 143 per cent, or two- 
fifths more of the spring-sown than 
of the fall-sown plants survived when 
fall planted; (2) 98 per cent, or about 
equal survival was attained from the 
two lots when spring planted; (3) 134 
