Report on the Agricultural Experiment Stations, 1952 Page: 44
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44 REPORT ON EXPERIMENT STATIONS, 1952
to be more economical than dry fertilizer and investigators found
that it was possible to obtain with it more effective control of the color
of the flowers on hydrangea plants.
The Effect of 2,4-D on Woody Ornamentals
The New York (Cornell) station has made a study of the effect of
chemicals used for weed control on woody ornamentals. Occasionally
there is a delayed damage when 2,4-D is used to control weeds growing
in close proximity to shrubbery. It has been found, however, that
damage can be minimized by September spraying of low amounts of
2,4-D in a single application at low pressure. Single winter treatments
of 2,4-D purposely applied at low pressure to dormant deciduous
shrubbery in amounts up to 1.6 pounds per acre failed to cause
delayed injury to the shrubbery.
Improving Greenhouse Soils
Composite greenhouse soils have been under study at the Storrs
station (Connecticut). Efforts were made to find organic materials
that would equal or exceed cow manure in providing good tilth for
soil in greenhouse benches. A 2-year study showed that the most
effective materials were sawdust, peat, muck, cow manure, and sugarcane
in the order given. The organic materials highest in cellulose,
however, such as sawdust and sugarcane, resulted in an unbalanced
nitrogen supply in the soil and adversely affected greenhouse crops.
The findings indicate that under the conditions of the experiment,
sawdust and sugarcane cannot be substituted for manures and peat.
At the Hawaii station various organic materials have been tried in
connection with the growing of anthuriums. This ornamental plant,
it is expected, will be a valuable addition to the floricultural markets
of the Hawaiian Islands. The station reports that plants will grow
well in macademia nut hulls, coffee parchment, and cane trash. Plants
grown in leafmold, taro pulp, and treefern fiber do moderately well,
but poor growth was reported when they were grown in volcanic
cinders, soil, or wood shavings.
Understock for Junipers
The Ohio station has reported on the value of using various understock
in grafting popular ornamental evergreens. Five scion varieties,
Juniperus virginiana burki, J. virginiana canaerti, J. virginiana
hill, J. chinensis columnaris, J. chinensis keteleeri, were side grafted
onto Eastern Redcedar, Chinese, Andorra, Irish, and Spiny Greek
junipers, and Oriental Arborvitae. After 4 years of growth the resulting
plants were compared over a period of 2 years. On the basis of
plant survival, growth rate, and quality of top growth of the scion
varieties, the understocks rated as follows: Eastern Redcedar, best;
Chinese juniper, satisfactory; Andorra, Irish, and Spiny Greek
junipers, fair to poor; and Oriental Arborvitae, poor.
The use of selected understock to cause dwarfing of evergreens has
been reported by the Oklahoma station. Following 3 years of growth
after grafting, it was found that four juniper species under test grew
from 39 to 60 inches on nondwarfing rootstock, whereas on dwarfing
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1952, book, January 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5990/m1/46/: accessed April 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.