Rrce nta 
tows 
ge of sugar 
a 
1916] PRITCHARD—SUGAR-BEET BREEDING 447 
The only practical method of overcoming the effects of sudden 
soil disturbances is the employment of replications. Repeated 
plantings of each family between check rows of a standard variety 
will give a more reliable means of comparison than a single planting. 
Row numbers 
a Go G76 85. oS: & 
~ ~~ UN 
> ff =. 
ba le 
3/0 
|320 
330 
> os 
oS 
% 
mae 
Pa 
; 
— 
Le 
Fic. 29.—Effect of soil irregularities on percentage of sugar of check and progeny 
» Madison, 1914; solid line indicates progeny rows (Madison Original Selections); 
~~ 
& 
eld 
e” 
Linas 
broken line, check rows. 
A decided change in the direction of the graphs is shown in 
TOWS 132-155, 346-382, and 595-612 of the 3 contiguous strips in 
figs. 24-26. This difference is not due to the presence of a dead 
how numbers 
mo SSRISESFSIESESSESSRSESRSSES 
3500p j | |_| 
3254) 2 be L rt 
Ez . of 52] ‘ 
$2750: § | ol fs “1, | MR | SF} apslods 
S25 OF it Gg 7 ob bid oe ' "4 
S22 W"\ VO y ’) oe “4 108 : e ’ ® 
Seq TPT Ter tg MS: 
S75 2 3 rT TTT Me 
SS /50 ie ae ep iy is 
Fic. 30.—Effect of soil irregularities on yield of sugar of check and progeny 
tows, Madison, 1913; solid line indicates progeny rows; broken line, check rows. 
furrow or back furrow, as no such areas were included in the 
experiment. Moreover, the disturbance covers an area 30-40 ft. 
wide in strips 1 and 2. The remarkable drops in percentage of 
