July i, 1921 
Further Experiments in Field Technic in Plot Tests 489 
inside border rows yielded approximately 5 bushels higher than the 
average for the central rows. 
Considered on the percentage basis the border effect, in 1918, on the 
outside rows was slightly higher for the oat and wheat crops and con¬ 
siderably lower for the barley crop than in 1917, The most striking 
difference in the results for the two seasons is that in 1918 the effect 
of the alleys for each of the three crops is much less apparent on the 
second rows (the middle border rows in 1918 and the inside border rows 
in 1917) than it was in 1917. The average in percentage for the three 
crops is 115.03 in 1918 as compared with 140.93 in 1917. In 1918, the 
third rows from the outside yielded approximately 5 bushels more than 
the average for the central rows for each of the three crops. Stated in 
percentages, the yields of the third rows from the outside are 106.1 
for the oats, 113.7 for the wheat, and 108.6 for the barley, or an average 
for the three crops of 109.47 as compared with the average for the 
central rows. 
Table III .—Average yields in bushels per acre of varieties of oats, wheat, and barley 
harvested from border drill rows, spaced 6 inches apart, removed from either side of 
each plot and from the central rows remaining after the removal of the border rows, 
and the yields of the border rows in percentages based on the yields of the central rows 
Year and source. 
Oats. 
Wheat. 
Barley. 
Number 
of rows 
or plots. 
Average 
yield per 
acre. 
Number 
of rows 
or plots. 
Average 
yield per 
aerq. 
Number 
of rows 
or plots. 
Average 
yield per 
acre. 
1918: 
Bushels. 
Bushels. 
Bushels. 
Outside border rows. 
112 
142.8 
56 
73 • 1 
72 
99-9 
Middle border rows. 
11 2 
82.8 
56 
40.8 
7 2 
60.9 
Inside border rows. 
112 
80.0 
56 
39 - 8 
72 
55 - 8 
Central n rows. 
5 ^ 
75-4 
28 
35 -o 
36 
5 i -4 
I 9 1 7 • 
Outside border rows. 
88 
131-97 
40 
55 -oo 
3 2 
97-73 
Inside border rows. 
88 
87.95 
40 
40.98 
32 
64.36 
Central 13 rows. 
44 
7 1 • 37 
20 
! 27.25 
16 
42.87 
1918: 
Per ct. 
Per ct. 
Per ct. 
Outside border rows. 
112 
189.4 
56 
208.9 
72 
194.4 
Middle border rows. 
112 
109.8 
56 
116.6 
7 2 
118.3 
Inside border rows. 
112 
106.1 
56 
Ir 3 - 7 
7 2 
108.6 
Central 11 rows. 
56 
100.0 
28 
100.0 
36 
100.0 
1917: 
Outside border rows. 
88 
184.9 
40 
204.4 
3 2 
238.0 
Inside border rows. 
88 
123.2 
40 
149-3 
3 2 
T 5 °- 3 
Central 13 rows. 
44 
100.0 
20 
100.0 
16 
100.0 
BORDER EFEECT AND THE INTERPRETATION OF YIELDS 
It has been shown that the effect of alleys increases the yields of the 
outside border rows very materially and, in the majority of cases, in¬ 
creases the yield of the second and third rows also, but to a less extent. 
On small plots the effect of the increased yield of these border rows 
