Aug. 26, 1918 
Variation and Correlation in Wheat 
385 
YIELD OE KERNELS CORRELATED WITH OTHER PLANT CHARACTERS 
The coefficients for yield of kernels per plant correlated with number 
of kernels per plant are 0.851 ±.0.010 in 1914, 0.881 ±0.006 in 1915, 
o.952±o.oo2 in 1916, and o.973±o.ooi in 1917. In contrast with the 
coefficients when weight of seed was correlated with plant characters, the 
correlation is consistently high in each of the four years. With a fair 
uniformity in the av¬ 
erage weight of ker¬ 
nels, hi,gh correlation 
between yield of ker¬ 
nels and number of 
kernels is to be ex¬ 
pected. 
Yield of kernels cor¬ 
related with average 
weight of kernels gave 
coefficients of o.550± 
0.027 in 1914, o.504± 
0.021 in 1915, o.370± 
20.02 in 1916, and 0.306 
±0.027 in 1917. This 
order is the opposite 
of the general tendency 
for the coefficients in 
this group to be lower 
in the first two than 
in the last two years. 
The correlation be- Fig - 8 -~ Graph showing regression for weight of seed and yield of 
kernels per wheat plant in 1917. 
tween the two charac¬ 
ters is substantial and fairly consistent. This indicates that the higher 
yielding plants have a tendency to produce kernels of greater average 
weight. 
The coefficients for yield of kernels correlated with the number of 
culms are o.5oo±o.o29 in 1914, o.669±o.oi5 in 1915, o.8i8±o.oo8 in 
1916, and o.824±o.oo9 in 1917. The correlation between the two 
characters is relatively high, but not as consistent as that between 
yield of kernels and number of kernels. Plants with the greater number 
of culms are usually the higher yielders. 
For yield of kernels correlated with average height of culms the 
coefficients are o.303±o.o25 in 1915, c.384±o.033 in 1914, o.452±o.C24 
in 1917, and o.478±o.oi9 in 1916. This is a substantial and fairly con¬ 
sistent correlation. For yield of kernels and average length of spikes, 
the coefficients are very similar to those between yield of kernels and 
average height of culms. There is a distinct tendency for the plants 
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