Hayes and Garber - Cucurbit Breeding

126 BREEDING CROP PLANTS
likewise studied, such as early maturity and high yield; shorthaired
rachilla and high brewing qualities in barley; weight of
1,000 grains in wheat, oats, and barley and yield; stooling with
yield and quality; size of spike or panicle and yield. In some
cases there seemed to be a relation between yield or quality and
some particular character, but when sufficient numbers were
studied no consistent association between any one morphological
character and yield was found.
Much investigational study has been made on this subject by
others and similar conclusions have been reached. At the Minnesota
Station correlations between yield and the following characters
in wheat have been sought; stooling, height of plant, size of
seed, date heading, and date of maturity. In some seasons the
early varieties were the better yielders and in other seasons the
later varieties.
Stooling was obtained from plots in which plants had room for
individual development, and the correlation of stooling and yield
was computed for two years for wheat, oats, and barley. Yield
was obtained from the replicated rod-row test. The results
showed no association between stooling and yielding ability.
Quite consistent association between weight of 1,000 plump
seed and yield of wheat as determined by the rod-row test
was obtained as is here shown.
TABLE XXVI. CORRELATIONS BETWEEN WEIGHT OF 1,000 PLUMP SEED
OF T. vulgare AND YIELD
Number of selections or
varieties in the population