■ ' y - WeSpeciollzeln A -
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Buildings end Equipment
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AGSTAR STANDS BEHIND
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EQUIPMENT WITH A
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Agstar Hog and Calf Equipment:
A Modular 24-lt wide farrowing
finishing I gestation buildings
B Modular 32 ft wide farrowing
nursery t gestation buildings
C Lot or pasture fountains
0 Hog lot gates I partitions '
E Heavy duty hog t cattle waterers
F Big capacity feeders
G Ventilation equipment
★ FULL LINE PARTS DEPARTMENT ★ WE SELL, SERVICE & INSTALL
EiMHEDD EQUIPMENT, INC.
Iv r iriHm. RDI.Rt. 272S.,HermlleRd.,
Willow Street, PA
Phone: 717-464-3321
Serving The Industry
For Over 20 Years
SWINE & CALF CASTLE
SELF-CONTAINED OR PITLESS
H Round feeders
I Feed delivery system*
J Gaivanued vertical pen partitions
K Hag troughs
L Rorcelainized Steel slats
M Rotary feeders
N force lalmied watering cups
O Baby pig feeders
f Farrowln* stalls (pens
0 F't heaters
R Nipple waterers
S Space-saver nursery feeders
T Flex auger systems deed bins
U Gestation stalls I buildings
V Soft-Grip Flooring
W Flat Deck Nursery
X Concrete g Fiberglass Slats
New theory ‘sheds
light 9 on plant growth
BELTSVILLE, Md. - Decades
old ideas about how light regulates
the growth and flowering of plants
are being challenged by a theory
developed at USDA’s Horticultural
Science and Plant Physiology
Institutes in Beltsville, Maryland.
Plants react to a continuous
gradient of light and radiant heat,
contrary to long-standing
assumptions that they respond to
only discrete bands and peaks of
red and blue visible light, ac
cording to H. Marc Cathey, a world
authority on growth regulation
systems and culture of ornamental
plants.
At a May symposium on
“Strategies of Plant Reproduc
tion” held by USDA’s Science and
Education Administration, Cathey
explained that research he and
colleagues Lowell E. Campbell and
Richard W. Thimijan conducted
shows,that solar and other optical
radiation outside the visible region
contribute to plant growth.
While' visible light and ambient
temperature measurements
correlate reasonably well for
plants grown under fluorescent
lamps, such measurements are
inadequate outdoors and wherever
plants are exposed to therrrtal
(heat) radiation in addition to
visible light.
These findings have important
consequences for enhancing plant
growth and reproduction. Cathey
and other" Beltsville scientists have
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• PLANNING LAYOUTS
• SALES
• INSTALLATION
• SERVICE
SHENK'S FARM SERVICE
501 E. Woods Drive Lititz, Pa. 17543 Phone 717-626-1151
Our Service Trucks Are Radio Dispatched
24 HR. SERVICE OFFERED
After 6 P.M. - Call:
Ray Shenk - 717-626-1152 Vic Leninger - 717-653-1378
Mervin Nissley - 717-872-4565 Gary Walton - 215-593-6966
Rick Thompson - 717-627-1530
Lancaster Farming, Saturday, June 20,1981—€
already shown that the size, shape,
color, pollution tolerance, and
flowering of many plants can be
influenced by manipulating
chemicals, light, and temperature.
The new theory could carry growth
regulation research even further.
Cathey, Campbell, and Thimijan
have found, for example, that
many economically important
crops (com, soybeans, and others)
can tolerate wide ranges of light
and heat. Their growth and
reproduction depends on the total
amount of radiation they receive
and not on the wavelengths of that
radiation. Within reasonable
limits, the wanner these plants,
the better they produce
The theory divides plants mto
four groups depending on their
thermal and spectral (light)
requirements. Plants are either:
spectral - and thermal-insensitive
(for example, roses and snap
dragons); spectral-insensitive and
thermal-sensitive (tomatoes,
geraniums); spectral-sensitive
and thermal-insensitive (lettuce,
strawberries); or spectral- and
thermal-sensitive (chrysan
themums, woody plants).
Thermally sensitive plants will
not tolerate high levels of non--
visible, infrared irradiance, said
Cathey. Spectrally sensitive plants
require wavelengths of relatively
low levels of blue and red light,
depending, instead, on a broad
band of the visible light spectrum.
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