Hayes and Garber - Cucurbit Breeding

FLAX AND TOBACCO 171
made to produce any quantity of seed ranging from a single pod up to
a large inflorescence by appropriate regulation of the quantity of soil
in which the plant grows."
Plants grown in 12-quart buckets produced large amounts
of seed when the length of day was shortened by placing the
plants in the dark chamber for a part of the normal day. A
control series left out of doors during the experiment began to
show flower heads about the middle of August (see Fig. 38).
Plants exposed to seven hours of light daily produced large quanti-
FIG. 38. Control series of Maryland Mammoth tobacco in twelve-quart
buckets left out of doors during the experiment. Flower buds just beginning
to show when photographed, August 19, 1919. (Courtesy of Garner.)
ties of seed while those exposed to twelve hours of light daily
grew larger but were later in blossoming (see Fig. 39) .
In southern Florida during the ordinary winter months, the
Maryland Mammoth behaves as ordinary tobacco, showing no
evidence of its tall late habit. Thus quantities of seed could
easily be produced
under these conditions.
Allard (1919) crossed normal varieties with the Mammoth
The Fi averaged somewhat higher in leaf number than the
type.