Dec. 15, 1925 
Studies in Western Yellow Pine Nursery Practice 1115 
For the 1913 beds, stock given one-half shade shows the greatest 
percentage of transplants alive both in the spring count (after one 
season) and the fall count (after two seasons), with one-quarter 
shade second and no shade last. The percentages were 95, 92, and 
83, respectively. The better survival for the one-half shade stock 
possibly may be ac¬ 
counted for because 
of the lesser density 
of plants in the one- 
half shade plot, or be¬ 
cause of some un¬ 
known variable in the 
transplant bed. 
Survival of trans- 
C 1 ts from the 1914 
given in Table 
VI corresponds in the 
spring count of 1915 
with the development 
of the seedlings and 
shows 63 per cent for 
no shade, 61 for one- 
J piarter shade, and 59 
or one-half shade. 
Survival in the fall, 
in percentage of the 
number transplanted, was greatest for the one-quarter shade stock 
(56), with no shade next (52) and one-half shade lowest (47). 
Table VI .—Seedling measurements and transplant data by month of germination , 
fall transplanting , series of 1914 
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Fig. 4.—Effect of early germination on size of seedlings (Pinus 
ponderosa). Comparison, at end of season, of seedlings germinating 
in May (1), in June (2), in July (3), and in August (4) 
Degree of shade 
Month of 
germina¬ 
tion 
Seedling measurements 
Transplant data 
Length 
root 
Length 
stem 
Length 
leaf 
Diam¬ 
eter 
stem 
Survival 
Height 
stem 
Diain- 
stem 
First 
spring 
First 
fall 
No shade -_ 
May.. ... 
Inches 
11.6 
10.2 
9.2 
5.4 
Inches 
2.7 
2.4 
1.7 
1.1 
Inches 
1.19 
1.07 
0.82 
0.48 
Mm. 
1.9 
1.8 
1.3 
1.2 
Per cent 
94.9 
75.8 
53.5 
10.0 
70.2 
Per cent 
93.1 
62.8 
44.5 
0.0 
57.9 
Inches 
4.3 
3.6 
3.4 
Mm. 
3.4 
3.0 
2.8 
Weighted average. __ 
June_ 
July_ 
August_ 
TVTixed 
3.5 
3.0 
9.1 
1.7 
0.89 
1. 5 | 63.1 
51. 7 | 3. 7 
3.0 
One-Quarter shade - -- 
May__ 
9.5 
8.7 
8.1 
5.6 
2.1 
1.8 
1.6 
1.2 
0.90 
0.87 
0.78 
1.5 
1.3 
1.2 
92.8 
85.0 
63.7 
40.0 
74.0 
91.0 
70.0 
64.8 
35.0 
57.0 
3.2 
3.1 
2.8 
1.8 
2.8 
2.8 
2.6 
2.0 
1.9 
2.5 
Weighted average . 
June_ 
July_ 
August_ 
Mixed_ 
0.48 1. 2 
7.9 
1.6 
0.75 
1.3 
60.8 
56.5 
2.7 
2.4 
One-half shade _ 
May_ 
10.5 
10.5 
8.7 
6.5 
L9~ 
1.5 
1.4 
1.0 
0.99 
0.86 
0. 71 
0.50 
1.4 
1.3 
1.2 
1.2 
97.8 
70.4 
70.4 
4.3 
62.8 
97.0 
58.2 
45.4 
3.3 
56.5 
3.4 
2.6 
2.8 
1.7 
3.1 
2.6 
2.3 
2.2 
1.7 
2.8 
Weighted average .. 
June.. 
July_ 
August_ 
Mixed_ 
9.0 
1.4 
0.86 
1.2 
58.9 
47.3 
2. 7 2. 3 
