4io 
Journal of Agricultural Research 
Vol. XI, No. 9 
variability or border rows, central rows, and three-row plots 
OR CHECK PLOTS OR HAYNES BLUESTEM WHEAT, LIGOWA OATS, MAN¬ 
CHURIA BARLEY, AND TURKEY WINTER WHEAT 
As a further study of the effects of competition between adjacent 
rows of small grains, the variability for the yield of the border rows and 
the central rows, as well as a comparison of the value of central rows and 
3-row plots is important. The results are presented in Table VIII. 
The number of tests, the place of test and the respective means, standard 
deviations, and coefficients of variability are given. 
Table VIII .—Comparison of variability of border rows, central, rows, and 3-row plots 
of check plots of Haynes Bluestem wheat {Minnesota i6g) \ Ligowa oats {Minnesota 281 ); 
Manchuria barley {Minnesota 103); and Turkey winter wheat {Minnesota 52Q) 
Plot or row. 
Designation of test. 
Wheat: 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Oats: 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Barley: 
Central rows. 
Lett border rows.. 
Right border rows. 
3-row plots. 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Winter wheat: 
Central rows. 
Left border rows... 
Right border rows. 
3-row plots. 
Central rows. 
Lett border rows... 
Right border rows. 
3-row plots. 
Plant Breeding Nursery. 
—do. 
....do. 
-do. 
Rarm Crops variety test. 
-do. 
....do. 
—do. 
Plant Breeding Nursery. 
—do. 
... .do... 
_do. 
Rarm Crops variety test. 
... .do. 
,.. .do. 
—do. 
Plant Breeding Nursery. 
—do. 
_do. 
—do. 
Rarm Crops variety test. 
... .do. 
... .do. 
....do. 
Plant Breeding Nursery. 
—do. 
— do. 
—do. 
Rarm Crops variety test. 
—do. 
....do..... 
—do. 
Number 
of tests. 
Mean. 
Standard 
deviation. 
Coefficient of 
variability. 
SI 
n. 7 
±0.190 
2.01 ±0.134 
17* 25±i. 187 
51 
11.1 
* 
• i99 
2. ii± 
141 
19- 08*1.325 
SI 
12.0 
* 
. 221 
2-34* 
.156 
19-44*1-350 
SI 
11. 6 
* 
* 157 
i.66± 
. HI 
14.30* .974 
15 
20. 6 
* 
. 261 
1. 50* 
.185 
7. 28* . 896 
15 
21.1 
* 
•317 
1. 82 ± 
. 224 
8. 63*1.063 
15 
20.1 
* 
.277 
i- 59* 
. 196 
7-9i± .974 
15 
20. 7 
* 
. 240 
1-38* 
. 170 
6. 67 ± . 821 
59 
5&3 
* 
•598 
6.8i± 
■423 
11. 68* . 732 
59 
55*5 
db 
. 761 
8.67 ± 
•538 
15-61* .989 
59 
57-7 
* 
*731 
8* 33* 
• 5i7 
14-43* *9i4 
59 
57* 2 
± 
•S87 
6. 68* 
■415 
11.69* .733 
20 
61. 2 
* 
.849 
S-63± 
. 600 
9- 20* . 981 
20 
61.8 
* 
. 908 
6. 02± 
. 642 
9- 74*1-039 
20 
61.9 
*1 
:. 106 
7- 33 * 
. 782 
11.84*1. 281 
20 
61.6 
* 
• 8 8s 
5-8?* 
.626 
9- 53*1- 016 
9 
36. 2 
* 
•949 
4. 22* 
• 672 
n.66±i. 872 
9 
36* 6 
±1 
:• 857 
8. 26*1 
■* 313 
22. 57*3.696 
9 
38.0 
* 
. 710 
3-i6± 
• 502 
8.32*1.323 
9 
37*0 
* 
.924 
4- n± 
•653 
11. ii±i. 784 
IS 
32.0 
* 
.381 
I- 90± 
•234 
5-94* • 731 
IS 
31* 0 
* 
*44i 
a * 53* 
.312 
8.16* 1.005 
IS 
30* S 
* 
•509 
2. 92* 
.360 
9-57*1-178 
IS 
31*3 
* 
. 29S 
l.?i± 
. 211 
5.46* .672 
72 
27 *5 
* 
•370 
4* 65 ± 
. 261 
16. 91 ± .979 
72 
27*4 
± 
.419 
5- 27± 
. 296 
19. 21*1.119 
72 
26. 0 
* 
.406 
5.11* 
. 287 
19-65*1.149 
72 
27. 0 
* 
•327 
4- 12* 
• 232 
15.26* .875 
41 
29. 1 
* 
• 504 
4. 78* 
•356 
16. 43*1. 256 
41 
28. 9 
± 
• S29 
5- 02* 
•374 
17-37*1- 332 
41 
27. 6 
* 
•473 
4-49* 
•334 
16. 27*1. 244 
41 
28.4 
± 
•403 
3-83* 
.285 
13. 49* 1- 023 
As has already been mentioned, the Farm Crops test is on a different 
series and under a different system of rotation than the Plant Breeding 
work. Furthermore, the check plots for the Farm Crops work occurred 
every third or fourth plot, while the Plant Breeding checks were placed 
every fifth plot. These differences may partially explain the lack of 
agreement in the coefficients of variability as determined for the tests. 
The data as given allows for two main comparisons, both of which are 
of importance in a discussion of rod rows as a means of determining yield. 
These are the relative variability for yield of the border and central 
rows and the relative variability of central rows and 3-row plot tests. 
