246 
Journal of Agricultural Reseat ch v<>i. xxx, no s 
Table I.— Average weights and measurements of 2-year-old. seedling stock , western 
yellow pine 
Date sown 
Length 
of stem 
Length 
of main 
root 
Length 
of 
needles 
Average number of rootlets, by 
grades, in each range of root 
lengths 
Weight 
of top 
Weight 
of root 
system 
Total 
weight 
of plant 
Primary 
Secondary 
0.5-2.0 
inches 
Over 2 
inches 
0.5-2.0 
inches 
Over 2 
inches 
Ins. 
Ins. 
Ins. 
No. 
No. 
No. 
No. 
Gm. 
Gm. 
Gm. 
Sept. 15.—. 
4.0 
13.9 
2.8 
12.8 
6.7 
1.3 
0.05 
2.05 
0.42 
2.47 
May 1. 
3.3 
14.1 
1.9 
12.7 
4.4 
1.0 
.06 
1.09 
.29 
1.38 
Table II.— Germination and development of 1-year-old western yellow pine seedlings 
Date of sowing, 1914 
% 
Total first 
season ger¬ 
mination 
Total loss 
in seed 
sown from 
damping 
off and sun 
scorch 
Development of seed¬ 
lings 
Average 
length of 
200 stems 
Average 
diameter of 
200 stems 
May 1______ 
Per cent 
33.1 
32.3 
26.9 
Per cent 
3.4 
2.9 
4.8 
Inches 
2.89 
2.57 
2.48 
Mm. 
2.12 
1.98 
1.93 
May 15________ 
June 1-- _ __ 
Table III.— Total germination from spring sowings 
* 
Date of sowing • 
Percentage of seed sown germinating 
1919 
1920 
1921 
Total 
1919 
May 5_______ 
10.0 
12.5 
12.7 
27.9 
62.2 
35.9 
22.7 
40.4 
64.3 
45.3 
May gl.________ 
1920 
Apr. 16______ 
1.9 
9.4 
May 5 _____ 
« 2,000 seeds sown on each date. 
SPRING SOWING 
In the spring of 1914 five plots of 
2,000 seeds each were sown, one on 
May 1, two on May 15, and tw on 
June 1. (See Table II.) Early sowing 
gave a greater total germination for 
the first season. This appears to be 
due to the longer germinating period 
and to the favorable conditions for 
germination which occur during May. 
Early sowing appeared to favor sur¬ 
vival slightly, although on this point 
the figures are not entirely in agree¬ 
ment. At the end of the season larger 
stock resulted from early sowing. In 
the spring of 1915 also two sowings of 
6,000 seeds each were made on May 6 
and May 15. Although these were but 
nine days apart, the total germination 
was again larger for the plots sown 
early and it was also more prompt. 
Subsequent to these tests no more 
sowings were made and no opportunity 
was afforded to compare different 
spring sowings until 1919 and 1920, as 
shown in Table III. The better re¬ 
sults in 1920 were again obtained from 
the earlier spring sowing, though the 
tendency appears to have been re¬ 
versed in 1919. The unusual hold 
over from 1919 sowings has already 
been mentioned and ascribed to the 
dry season. The exceptional season 
may also be the cause of an exception 
to the general rule of larger totals from 
earlier sowings. 
