. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 2G RESPONSE OF PLANTS TO ARTIFICIAL LIGHT followinfj the use of the incandescent gaslif!:ht and the incandescent electric li^ht as well, as jjjathered from these experiments, is from their richness in red and oranjje rays. A summary of the results of Corhett's work showed : (1) The incandescent gaslight of the Welsbach burner was an active stimulus to plant growth when used at
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 2G RESPONSE OF PLANTS TO ARTIFICIAL LIGHT followinfj the use of the incandescent gaslif!:ht and the incandescent electric li^ht as well, as jjjathered from these experiments, is from their richness in red and oranjje rays. A summary of the results of Corhett's work showed : (1) The incandescent gaslight of the Welsbach burner was an active stimulus to plant growth when used at night to supplement Fig. 46. Plants grown whoUy by acetylene light, with (2) Lettuce plants subjected to the influence of the incandescent gaslight at night were taller and heavier than plants of the same variety and seed- sowing grown in normal conditions. (3) Lettuce and spinach subjected to the stimu- lating influence of the light grew faster and com- pleted their growth in less time than plants of the same sorts from the same seed-sowing grown in normal conditions. (4) No injurious effects resulted from the use of the incandescent gaslight. (o) The stimulating influence of the light as indi- cated by the growth of plants used in various tests is shown by the order in which the sorts are named, the first being the most susceptible — spinach, cab- bage, radish, lettuce, tomato. (6) The range of the light was somewhat vari- able for the different crops. In general, the maxi- mum growth was attained at twelve to sixteen feet from the light, while a perceptible increase was noted at twenty-four feet. (7) Bloom record of tomatoes showed markedly earlier bloom in the light house,— eight days the least and eighteen days the greatest difference. (8) In the case of radishes, top growth was stim- ulated, but evidently not markedly, at the expense of root. With sugar-beets, top growth was greatly stimulated, evidently at the expense of root growth. (9) While the roots of
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