—Lancaster Farming, Saturday, July 8, 1972
12
Vegetables Start Early in Plastic Covered Trenche
Harvest sweet corn and
tomatoes ten days to two weeks
ahead of season.
They’re doing just that in a
research plot at the University of
Delaware’s Substation in
Georgetown, according to Robert
Stevens, extension horticulturist.
The vegetables were planted
March 28—several weeks ahead
of the normal schedule—in a
special plastic covered trench.
With this system, plants can go
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in the ground as soon as the soil
temperature starts to warm up.
Plants are protected even if air
temperatures dip down to 25
degrees provided it doesn’t stay
that cold for too long. This spring,
com and tomatoes even survived
an early April sleet storm.
On a sunny, breezy spring day,
the temperature under the plastic
is as much as 30 degrees warmer
than the open air. On a cloudy,
still day, the difference may only
be four to six degrees.
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The trenches used in the ex
periment were eight inches deep
with one side ridged higher than
the other. They run east to west
so the plastic catches more
sunlight. When the continuous
strip of plastic is laid down, water
will drain off the slope, Stevens
explains. Once the plants grow up
to the plastic, it is rolled back.
He used a special plow to make
the unevenly ridged trenches;
only two of these plows have ever
been manufactured. However,
homeowners could easily dig the
trenches by hand and other plows
could be adapted by growers
working on a small scale.
The sloped plastic covering
didn’t work perfectly, Stevens
admits. Some water collected. It
may be necessary to poke a few
holes in the plastic or sweep the
water off by hand. Of course, any
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holes also let in cold air which
could partially defeat the whole
purpose of the plastic.
makes no difference in the size or
quality of the vegetables. There
could be more diseases and in
sects under plastic if they are
already on the plants when set
out.
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Laying down the plastic
digging the trenches is too
pensive for large-scale c
mercial growers, Stei
believes. However, the techn
should be valuable for h
gardeners and for farmers
grow for the local fresh mark*
roadside stands.
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Columbia
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