22 
BULLETIE" 1343, U. S. DEPARTMENT OF AGRICULTURE 
Table 15. — Average dates of sowing and of ripening, height of plant, percentage 
of lodging, 'bushel iceight, and the annual and average acre yields of the 
logren and Green Russian oat varieties at the Iowa Agricultural Experiment 
Station for the seven years from 1916 to 1919, inclusive, and in 1921, 1922, 
and 1923 ^ 
Items of comparison 
logren 
Green 
Russian 
Items of comparison 
logren 
Green 
Russian 
Average date sown 
Apr. 16 
July 20 
40.9 
2.1 
64.4 
62.5 
82.5 
Apr. 16 
July 19 
40.1 
4.3 
53.6 
50.0 
74.4 
1919 
50.0 
40.6 
65.0 
84.7 
45 9 
Average date ripe 
1921 
37 8 
Average height of plant, inches. 
1922.. 
57 5 
1923. 
74 7 
Acre yields of grain (bushels) : 
1916 
Average 
64.2 
32.0 
56 3 
1917 
1918 . 
Average bushel weight 
pounds.. 
31.7 
1 No varietal experiments were conducted in 1920. 
According to the yield data presented in Table 15, during the 
seven years in which they have been compared logren has outjdelded 
Green Russian by T.9 bushels to the acre. A statistical study ^ of 
this difference indicates odds of 1,999 to 1 that logren will outyield 
the parent variety, Green Russian. 
In time of ripening logren is about one day later than Green Rus- 
sian. In weight per bushel it is slightly superior. 
EXPERIMENTS ON IOWA FARMS 
logren was grown on Iowa farms in comparison with the parent 
variety (Green Russian), lowar, and other miscellaneous varieties 
during the seasons of 1922 and 1923. The number of farm experi- 
ments in which logren w^as compared with other varieties w^as as fol- 
lows: Green Russian 25, lowar 35, and miscellaneous 51. A sum- 
mary of the average yields of these experiments is given in Table 16. 
Table 16. — Average 
of logren and other oat varieties grown on 111 
Iowa farms in 1922 and 1923 
Number of 
trials 
Acre yield of grain (bushels) 
Home-grown varieties 
logren 
Home- 
grown 
varieties 
Difference 
25 
35 
51 
49.91 
49.80 
48.66 
44.87 
48.09 
44.38 
5.04 
lowar 
1.71 
Miscellaneous varieties.. . 
4.28 
Weighted average of all trials 
111 
49.30 
45.66 
3. 64 
The data presented in Table 16 show an average difference of 5.0-1: 
bushels in favor of logren over the parent variety. Green Russian. 
For the 111 separate trials the average yield for logren was 
c See footnote '2, page G. 
