Hayes and Garber - Cucurbit Breeding

Average
42 BREEDING CROP PLANTS
tobacco crosses and their parents. All crosses do not prove
equally vigorous and a few give no increase as compared with the
parental average. In general, however, the crosses show increased
yields. As the tobacco flower produces many seeds,
Houser (1912) believes the extra cost of production would not
be prohibitive. Before this plan can be adopted commercially,
extensive studies are needed to determine the value of particular
F\ tobacco crosses.
TABLE IV.
RELATION OP YIELD PER ACRE BETWEEN FIRST GENERATION
HYBRID TOBACCO AND THE PARENT PLANTS
Average yield of
j
increase of hybrid