8 
BULLETIX 307^ U. S. DEPAETMEXT OF AGKICULTUEE. 
conditions, however, different varieties are affected in much the same 
way; that is, differences between early and late varieties are in a 
measure retained, whether maturity is delayed or hastened by growing 
conditions. 
The varieties previously described are arranged in Table I in their 
approximate order of earliness, as nearly as this could be judged from 
all the tests conducted. The earliest varieties are placed first and the 
latest varieties last in the table. The extreme range in time of 
maturity is about 25 days. The earliest varieties require under 
average conditions from 75 to So days, while the latest ones require 
from 100 to 110 days to mature. 
For convenience of reference the varieties are divided into three 
classes, designated as very early, early, and comparatively late. 
There is a marked difference in the average time of maturity of these 
classes, but the lines between classes are necessarily somewhat arbi- 
trary; that is, the differences between the last varieties in one class 
and the first varieties in the next class are not greater than the differ- 
ence between varieties of the same class. 
Table I. — Corn varieties in the order of their earliness in reaching maturity. 
Class 1. 
Class 2. 
Class 3. 
Very early varieties: 
Eaxlv varieties: 
Comparativelv late varieties: 
Gehu Flint. 
Martens "WTiite Dent. 
North Platte Silver Mine. 
Northwestern Dent. 
U. S. Selection 133. 
North Platte Calico. 
Minnesota 23. 
Minnesota 13. 
US. Selection 160. 
Brown County Yellow. 
Cassia Countv Flint. 
Ardmore Yellow. 
AMiite Australian. 
Mitchell Blue Flour. 
Swadlev. 
Dakota Red Squaw. 
Ninety-Day Disco. 
Amber Flint. 
Mitchell Calico. 
Golden Glow. 
Colorado Early Select. 
Wisconsin 7. 
RESULTS OF TESTS OF VARIETIES. 
Tests of corn varieties have been conducted at several stations in 
the north-central Great Plains area. Yields secured for each station 
and year when a successful crop has been produced are shown in 
Tables II to VII. These yields do not indicate what may usually 
be expected in any locality in an average or normal season. They 
more nearly represent what may be expected in favorable seasons 
under good farming practice. 
Careful attention has been given to securing uniform conditions for 
all varieties in each test, but no unusual or intensive methods of cul- 
tivation or manuring have been employed. At aU places where the 
crop has depended upon the natural rainfall for moisture, total 
failures or very low ^-ields have resulted in some years. The results 
indicate the behavior of different varieties under the same conditions. 
