Hayes and Garber - Cucurbit Breeding

122 BREEDING CROP PLANTS
In the above table mean error is used instead of probable error
(mean error X 0.6745 = probable error). The means, both in the
minus and in the plus direction, show no effect of continuous
selection.
In 1914 Hutcheson published the results of
13 years of continuous
selection in wheat carried on at the Minnesota Station.
Here again no significant effects of selection are found. Table XXI
presents a comparison of the yields for the first five-year period
with those of the last five-year period.
TABLE XXI. COMPARISON OF AVERAGE YIELD PER PLANT IN GRAMS OF
FIRST FIVE-YEAR PERIOD WITH THOSE OF LAST FIVE-YEAR
PERIOD IN CONTINUOUS SELECTION OF WHEAT
Variety