. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 11 PLATE 71 A.—Maryland Mammoth tobacco in 12-quart buckets exposed to light from 6 a. 6 p. m., or 12 hours daily. Flower heads forming but no open blossoms presentwhen photographed August 19, 1919. B.—Maryland Mammoth tobacco in 12-quart buckets exposed to light from 9 a. 4 p. m., or 7 hotirs daily. Seed pods formed when photographed August 19. PLATE 72 A.—Control series of Maryland Mammoth tobacco in 12-quart buckets left out ofdoors during the experiment. Flower heads just beginning to show when
. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 11 PLATE 71 A.—Maryland Mammoth tobacco in 12-quart buckets exposed to light from 6 a. 6 p. m., or 12 hours daily. Flower heads forming but no open blossoms presentwhen photographed August 19, 1919. B.—Maryland Mammoth tobacco in 12-quart buckets exposed to light from 9 a. 4 p. m., or 7 hotirs daily. Seed pods formed when photographed August 19. PLATE 72 A.—Control series of Maryland Mammoth tobacco in 12-quart buckets left out ofdoors during the experiment. Flower heads just beginning to show when photographedAugust 19, 1919. B.—Asier linariifolius L. Plants in box on left exposed to light from 9 a. m. to4 p. m. daily. In full bloom when photographed June 24. Plants in box on rightleft out of doors during the test. Showed no indications of flower heads when photo-graphed June 24. Effect of Length of Day on Plant Growth Plate 72
Size: 1853px × 1348px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913
