500 
^ STRy^/A/ A/o. S 
6 BULLETIN 1341, U. S. DEPARTMENT OF AGRICULTURE 
DATA ON PRODUCTIVENESS 
A summary of the yield data is shown in Table 2. The data in 
column 2 of this table show the total number of plants from which 
the yields were determined. The differences between the numbers 
of plants of any two kinds were negligible, and no corrections were 
made for stand. The data on shrinkage after harvest and percent- 
age of grain to ear were determined from duplicate samples, each 
consisting of the en- 
tire product of a 
single replicate. The 
greater loss of mois- 
ture (column 3) in 
the selected strains 
with larger numbers 
of kernel rows prob- 
ably was due to their 
slower drying be- 
tw^een maturity and 
harvest. At least 
there was no evident 
difference in the ma- 
turity of the strains 
or crosses in the field. 
The selected strains 
with larger numbers 
of kernel rows had a 
higher percentage of 
grain (column 4) than 
those with fewer 
rows, as would be ex- 
pected. There is no 
apparent reason for 
the low percentage of 
gi-ain in strain No. 3. 
The relation between 
number of kernel 
rows and shrinkage 
or percentage of grain 
is less definite in 
the crosses between 
strains. The 3^ield 
data (column 5) are 
the harvest weights 
computed to terms of 
air-dry shelled grain 
The probable errors 
\400 
500 
400 
300 
200 
/OO 
ST/14I//V /^o. 6 
\~^/Vo.6 ^ No.3 
STR/i/A/ A/0.3 
^ sr/^^//v A/o. 6 
I \a/o.6 XA/o./ 
^^^ STR/:)/A/ A/o. / 
V/ Z^A 
/O /2 /4 /6 /a 20 Z2 24 26 28 30 32 
A/L/AJBER OF /<£RA/£L ROIVS 
Pig. 2. — Distributions of the ears of three corn crosses 
find their parent strains with respect to the number 
of kernel rows 
on the basis of the data in columns 3 and 4. 
were computed from the formula — 
Error mean = ±0.6745 /- 
n being 17 except for C. I. Xo. 119, where it Avas 25. The data in 
column 6 were obtained by dividing the values in column 5 by the 
mean yield of C. I. No. 119 in the same section. 
