Nov. 26,1917 
Field Technic in Rod Row Tests 
407 
results are obtained in a similar way as for the effects of height. Table IV 
is given as an illustration of the method used. This result shows con¬ 
siderable effect due to yield of adjacent rows on the border rows of the 
same variety. 
Table IV. —Correlation between the differences in yield of the border rows of a variety and 
the differences in yield between the adjacent rows on the left and right , respectively . 
Barley Plant Breeding Nursery , igi6 
[Left greater^ +. Right greater^ — J 
Yield, difference classes, border rows of same variety. 
—9 
- 7 -S 
-6 
- 4-5 
—3 
-i -5 
0 
+1.5 
+3 
+4.5 
+6 
+ 7-5 
+9 
— 21 
-l8 
I 
I 
I 
I 
s 
“IS 
—12 
1 
I 
.8 
O 
“ 9 
- 6 
1 
I 
1 
2 
3 
2 
8 
cd 
2 
I 
5 
§ 
“ 3 
0 
1 
1 
4 
I 
7 
it 
^ £ 
2 
I 
2 
2 
1 
I 
9 
V 
u 
I* 
+ 3 
+ 6 
+ 9 
+12 
+i 5 
+18 
1 
I 
I 
1 
1 
7 
11 
1 
0 
1 
I 
1 
2 
O 
6 
1 
I 
1 
I 
4 
1 
1 
1 
X 
’■d 
O 
0 
13 
I 
1 
B 
i 
K 1 
3 
I 
2 
3 
7 
5 
6 
6 
11 
9 
° 
2 
2 
57 
r=-o.394±o.o75 
The correlation coefficients as obtained for the various crops are given 
in Table V. 
Table V. —Correlations between the differences in yield between the border rows of a 
variety and the differences in yield between adjacent rows of unlike varieties of cereals 
Cereal. 
Designation of test. 
Number of 
tests. 
Correlation 
coefficients. 
Barley.. 
Do. 
Oats... 
Do. 
Spring wheat. 
Do. 
Winter wheat... 
Do... 
Plant Breeding Nursery. 
Farm Crops variety test. 
Plant Breeding Nursery.... 
Farm Crops variety test. 
Plant Breeding Nursery.... 
Farm Crops variety test. 
Plant Breeding Nursery,. . . 
Farm Crops variety test. 
57 
48 
218 
121 
193 
50 
183 
38 
“0. 394±0.075 
— . 040± .097 
+ • IOO± . 045 
+ . oi7± . 061 
-j- . 007 ± .049 
— . 290± . 087 
4- .o82± .050 
+ - 3 1 5 ± *099 
These results show less effect of competition due to the yield of adjacent 
rows than in the case of the height of adjacent rows. The coefficient 
obtained in the Plant Breeding results for the barley test was 
