4 BULLETIN 1321, U. S. DEPARTMENT OF AGRICULTURE 
Be of the plats varied from 48 to 100 ear rows, the total for the period being 
95 rows. 
Cereal Investigations No. 133 is a selection from Minnesota No. 13. It is an 
early yellow dent with rather short kernels. The plants are about 7 feet high 
and require about 90 days to mature. The plats were located near Oconomowoc, 
Wis., from 1908 to 1917. No data are available for 1915, when the crop did not 
mature. ‘The plats varied in size from 46 to 90 ear rows, the total] for the period 
being 619 rows. No duplicate plantings were made. 
VARIABLES 
The variables considered are shown in Table 1. The letters under 
“Symbol” are used throughout to indicate the respective variables 
in connection with the symbols for the different constants. The 
units and limits of measurement and the class intervals also are given 
in Table 1... Most of these are self-explanatory. 
The basic yield records comprised the total ears husked from the 
respective rows as weighed at harvest time or the mean of two rows 
when the planting was duplicated. It was necessary to avoid the 
influence of the wide variation in yield from year to year due to soil 
and climate. The mean yield of all rows of a variety in a season 
therefore was computed, and the yields of the individual rows were 
expressed as percentages of the mean for that season. ‘These per- 
centages were used in computing the correlations and are designated 
as variable Ain Table 1. This gives the same weight to a deviation 
of 5 bushels in a season in which the average yield was 50 bushels as 
to a deviation of 8 bushels in an 80-bushel year. 
TaBLeE 1.—Yield and physical characters of seed ears that are treated as variables 
in this bulletin, together with the units and limits of measurement and the class 
intervals used in determining the different constants 
Symbol Variable Units and limits of measurement fess inter, 
A Rte Be ene) 96 leapt Rr Se eal eR RE oe dper cent $24 Sho reir Sod Sere 5 per cent. 
Biae sce Whreigiit. ey. 4 ee Ma ees ee es Agrambe pee oe BBB ee 15 grams 
Gf niall fe sap SOT Gy ee ne Sen es eee een areata See emer VE ANCHE oa Sen eee Y% inch 
oT A ta ras at ‘Butizcircumferencel:c= Pats so be Pere ee eee ees ORE 8s DEY Bees aaa 0. 
y Danco Pe Rh Ripieircum#flerence 4. =<. Lees eee 6 Ko [ete agree MeL tee cat Do. 
Heart sesf Cob weight 22s. fies § sce eet eee be tees Tt gram 2 °F ONY pee tae ae 4 grams. 
Garp ee. Rereentage ofjeraine = 222 ee J WOR CGMb=.s2 2 meu. 408 peace 1 per cent. 
i 7 eran gie eos RUOWSIOLKEIME IS 5 cee ho eerie ea er Wet ialmuin bere eee 2 rows. 
FL Ri 8 Kernels per rowie2iU 22 GR ae es Goes feo Ts Shae 17s es 2 kernels. 
1 Measured about one-third of the distance from the butt. 
2 Measured about one-third of the distance from the tip. 
Records of the moisture content and shelling percentage of the 
harvested ears were not available. However, the varieties were 
well adapted to the respective environments in which they were 
grown, unduly late rows producing excessively sappy ears were not 
selected for propagating further, regardless of their yield, and selec- 
tion for any specific type of ear was not continuous. Consequently 
it seems safe to assume that the effect of differences in moisture and 
shelling percentage was very slight, if not entirely negligible. 
The means, maxima, minima, standard deviations, and coefficients 
of variation are shown in Table 2 and ratios between the means of 
some of the characters in Table 3. These show the diversity in 
character and variability in the varieties, 
