Experiment Station Record, Volume 69, July-December, 1933 Page: 49
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1933] HORTICULTURE 49
BROWN, 0. N. RILEY, I. C. HOFFMAN, D. COMIN, S. C. HARTMAN, W. MAHAN,
M. A. BACHTELL, and L. W. SHERMAN (Ohio Sta. But. 516 (1933), pp. 55-63, 65,
66, 107, 108, 109, fig. 1).-In accordance with the usual procedure (E.S.R., 67,
p. 35), brief reports are presented on the progress of various studies, such as
the growth of flowering plants under cloth; the effect of supplementing the
daylight period with electric lights on the time of bloom of flowers; the treatment
of cuttings with emulsified paraffin and liquid rubber and various methods
of handling; the nutrient needs of shade trees and flowers; the protection of
evergreen stock with paraffin; the fertilizer requirements of red and black
raspberries; varieties of strawberries and sweet cherries; the development of
apple roots as related to culture and soil types; the value of cyanamide as an
orchard fertilizer; fertilizer requirements of apple trees; the age of maximum
productivity in apples; the Turley apple; the spraying and dusting of apple
orchards; grafting materials and methods; varieties of vegetables; the effect
of soil moisture on the yield of greenhouse tomatoes; the irrigation of muck
crops; and onion varieties.
In addition there are summarized the results of orchard dusting experiments
at the Washington County Experiment Farm, nitrogen fertilizer studies with
apples at the Belmont County Experiment Farm, and the effect of limestone on
orchard vegetation at the Mahoning County Experiment Farm.
[Horticulture at the Puerto Rico Station], T. B. MCCLELLAND, R. L. DAVIS,
and H. C. HENRICKSEN (Puerto Rico Sta. Rpt. 1932, pp. 4-6, 16, 17, 18, 19, 20,
21, figs. 3).-Brief mention is made of experiments on the shading of coffee;
the vegetative propagation of coffee; breeding and improvement of sweet corn;
absorption of ash constituents by citrus trees; control of time of blooming of
citrus trees and pineapples; and on the production of bay oil. The accession
of seedlings and new forms of pineapple for future breeding work is mentioned.
The response of greenhouse crops to electric light supplementing daylight,
L. GREENE, R. B. WITHROW, and M. W. RICHMAN (Indian.a Sta. Bul. 366
(1932), pp. 20, figs. 12).-That many ornamental plants flower earlier and more
profusely when supplied with supplemental illumination was indicated in studies
extending over a 2-year period and involving many species. High intensity
illumination was not found essential or even beneficial with most plants; in
fact the light from 50- and 100-w lamps placed 50 in. above the bench produced
almost as favorable results as did much higher intensities. A relatively long
period of low intensity illumination was found much more favorable in the
production of earlier and more abundant flowering than were higher intensities
for shorter periods. The time of night during which the additional light was
supplied was often a factor but not to an extent requiring the use of specific
treatments. Ultraviolet light in wave lengths shorter than those of the solar
spectrum was found harmful to plants.
The variable results obtained with different species indicated that the most
favorable conditions of lighting should be determined for each species and in
many cases for each variety. For example, some plants illuminated only during
the early seedling stage flowered as soon as others illuminated during their
entire life. On the other hand, certain plants responded most favorably to
illumination applied at a more mature stage.
Supplemental light made possible the production of an early spring crop of
asters. Pansies and calendulas responded very favorably when illuminated
with a 100-w lamp for 10 hours each night during the entire life of the plants.
Easter lily (Lilium gigantevm) flowered earliest when irradiated for the first
172887-33---4
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A topical, alphabetically arranged index to volumes 61-70 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 69, July-December, 1933, book, 1934; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5087/m1/69/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.