Experimental Error in Crop Tests 
47 
EFFECT OF REMOVING SUCKERS WITH DIFFERENT VARIETIES 
Occasionally an investigator has removed the suckers from 
his corn varieties or selections in order to avoid annoyance 
by them. The data in Table 25 indicate that the removal 
of suckers may affect different varieties differently, and that 
a new error m testing may be introduced thereby. 
Table 24 — Relation of rate of planting to yield of corn varie- 
ties differing in growth habit groivn in three-roiv plats 
Plants 
per 
hill 
No. of 
replica- 
tions 
Length 
growing 
Period 
Barren 
stalks 
Two- 
eared 
stalks 
No. of ear 
bearing 
suckers 
per 100 
plants 
{ r*Pn 1"Pr 
\ Cell Lt'l 
Days 
Per cent 
Per cent 
Bushels 
PRIDE OF THE NORTH 
1 
3 
92 
0 
8 
7 
17.4 
2 
3 
92 
0 
1 
2 
28.2 
3 
3 
92 
2 
0 
0 
35.5 
4 
3 
92 
2 
0 
0 
39.8 
5 
3 
92 
8 
0 
0 
UA 
UNIVERSITY NO. 3 
1 
3 
107 
0 
14 
20 
40.2 
2 
3 
107 
1 
3 
2 
59.6 
3 
3 
107 
6 
1 
0 
59.5 
4 
3 
107 
8 
0 
0 
52.7 
5 
3 
107 
15 
0 
0 
47.3 
HOGUE'S YELLOW DENT 
1 
3 
119 
0 
10 
19 
UA 
2 
3 
119 
1 
1 
2 
63.9 
3 
3 
119 
2 
0 
0 
59.0 
4 
3 
119 
7 
0 
0 
59.8 
5 
3 
119 
13 
0 
0 
53.7 
RELIABIIilTY OF ESTIAIATIXG PLAT YIELDS BY MEANS 
OF FRACTIONAL AREAS 
In conducting field experiments in cooperation with 
farmers, experiment stations frequently encounter difficulty 
in having test plats properly harvested and threshed. In some 
states the yields of such plats are estimated by harvesting 
a number of very small apparently representative areas 
from each of the plats to be compared. The small quantity 
