1916] PRITCHARD—SUGAR-BEET BREEDING 455 
As corrected yields, that is, yields corrected for a full stand by 
means of the regression coefficient between number of roots and 
yield of sugar per row, were employed in figs. 38-41, and actual 
yields in figs. 37 and 46-49, their relationship has been determined 
ge weight 
in gra 
age 
r 
Row numbers 
900 /7 
700 /5) ay 
600 4 r. 3 lk bos 1 VIER ir 
$00 13 4 : mp bay 
400 12 | | 
| 
300 v|_| | | | | 
Fic. 43.—Effect of soil irregularities on relationship between percentage of 
sugar sind average weight of root in consecutive check rows, Madison, 1912; soli 
line indicates percentage of sugar; broken line, average weight of root per row 
Avera 
oe: 
30 
40 
50 
|_| _R¢ 
— 
b 4 
and illustrated in fig. 50. Only rows containing a stand of 80-100 
per cent are connected. The o’s of the unconnected rows represent 
actual yields, and the x’s represent corrected yields of rows con- 
taining less than 80 per cent stand. 
Bees Row numbers 
SSCB SRR SSES SSERESSERSSSRBESS 
| 
aS | © bose] : $ Ft *] : 
ae Ie) te) 
G. 44.—Effect of soil irregularities on relationship between percentage of sugar 
and average weight of root in consecutive check rows, Madison, 1913; solid line indi- 
cates percentage of sugar; broken line, average weight of root per row. 
The graphs show practically the same progressions and trends. 
The use of actual yields instead of corrected yields, therefore, in some 
of the figures did not materially alter the results of comparison. 
