Dl2—Lancaster Farming, Saturday, April 10,1982
Researchers develop
COLLEGE PARK, Md. -
Agronomy researchers for the
Maryland Agricultural Ex
periment Station have begun ef
forts to develop new soybean
varieties especially suited to no-tdl
double-cropping methods.
As double-cropping under no-till
cultivation methods increases in
popularity throughout the state,
researchers have found older
varieties of soybean lines have not
given yields or shown disease
resistance most farmers and
researchers expected, according
to William J. Ke'nworthy, noted
soybean breeder for MAES and an
associate professor of agronomy at
the University of Maryland,
College Park.
No-till cropping is a cultivation
practice in which a crop such as
soybeans is planted directly into
the stubble of a previously har
vested crop without plowing or
other methods of breaking the
topsoil.
“Nationwide, breeding
programs for no-till, double
cropping practices are only four or
five years old and have centered
for the most part m southern states
like Georgia, North Carolina,
Virginia and Kentucky," says
Kenworthy.
“This year, Maryland has begun
its own breeding program for
double-cropping soybeans, one
that is specially suited to
Maryland’s growing conditions,”
he adds.
Existing full-season varieties
under double-cropping cultivation
have shown reduced yields, ac
cording to Kentucky. And
Maryland’s characteristic warm
and humid climate during plant
maturation at the end of the
summer provide the optimum
climatic conditions for fungal seed
diseases that affect seed stock
quality.
Maryland’s breeding program,
therefore, will emphasize iden
tifying those plant traits that
appear to limit double-cropping
soybean varieties suited to no-till
• researchers have “several
promising new lines” now; but
they will require additional testing
before seed stock is available for
release to farmers.
soybean productivity, says Ken
worthy. This will make it easier for
researchers to breed for
characteristics more adaptable to
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Kenworthy adds
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