1916] PRITCHARD—SUGAR-BEET BREEDING 445 
ous strips whose row ends abut, and noting whether the same rela- 
tive parts of the different strips show the same irregularities. 
Another check better adapted to show local soil irregularities and 
more generally applicable consists in plotting the mean values of 
Row numbers 
we SZEESESELSLSESRESLERES 
a CECH ie BE 
S 5 qi he | fil |e 
ehh aba aetna i Pt 
se “ye! e ‘ " ‘ aa 1 
Re ie ¥ : y , 
8 // 3 \ | % a! 
Cro Lo Bema s 
Fic. 26.—Effect of soil irregularities on percentage of sugar of check and progeny 
rows, strip 3, Madison, 1912; solid line indicates progeny rows; broken line, check 
ro 
the check rows in regular order. If these values show the same 
progressions as the means of the progeny rows, the effects are 
doubtless due to irregularities of the soil. 
Row numbers 
SESSSSSSFSSSRSTSKESSRSRSR SEES 
0 a ea ee 
$ RESs. ; 
‘5 & ow a. 
& / im > es 
#14 Hf | | 
8.3 @ sBSanenax 
& 72 SOS SSST VSR ee ees | 
soil irregularities on percentage of sugar of check and progeny 
27.—Effect of 
rows, Mate 1913; solid line indicates progeny rows; broken line, check rows. 
In the accompanying graphs, figs. 24-29 show the mean per- 
centage of sugar, and fig. 30 the mean yield of sugar of consecutive 
progeny rows and check rows. Figs. 24-26 represent 3 contiguous 
strips of the same field which meet at their row ends. Strips 1 and 
2 were planted on the same date, but strip 3 was plowed up and 
replanted on account of a poor stand. Consequently, the beets 
