Fort Collins, Colorado
July 16, 2003
A
Colorado State
University study takes a step towards finding solutions to
pollen drift from genetically modified plants onto organic and
traditionally grown crops, a concern raised by some members of
the public. The study shows that in Colorado, about 150 feet may
be a reasonable buffer zone between genetically modified corn
plots and organic and traditional corn plots to prevent
significant cross-pollination due to pollen drifting from one
field to another.
The first round study was
conducted in Morgan County in eastern Colorado, the state's corn
belt - and also a windy area in the region, and at a second
location on a plot in Boulder County. Results showed that less
than 1 percent of corn farther than 150 feet from test plots is
cross-pollinated by pollen from the test corn. That means that
very little of the pollen from the test corn fields drifted more
than 150 feet.
"We realize that one year's data
is not sufficient for this type of study," said Patrick Byrne,
Colorado State University crop sciences professor and
researcher. "Given the year-to-year variability in weather
conditions, we will repeat the research again during the 2003
growing season."
The study tracked drift of blue
kernel corn pollen at one site in Boulder County and the drift
of Roundup Ready corn, a genetically modified crop, at the
Morgan County site. The corn was planted adjacent to corn
varieties without those traits. When the corn was harvested,
samples were collected from various distances away from the test
plots. These samples were tested for traits from the test plots,
which indicate the amount of cross-pollination. The farthest
sample was collected 305 meters - about 915 feet -- away from
the edge of the test plots.
Cross-pollination was highest at
the closest sampling sites -- up to 46 percent at three-quarters
of a meter south of the blue corn plot in Boulder County.
However, cross-pollination dropped off in a short distance, with
only 0.5 percent cross-pollinated kernels near the blue corn
plot at 150 feet. At that same distance in the Morgan County
plot, 0.75 percent of the corn showed cross-pollination with the
Roundup Ready test plot. The farthest distance at which any
cross-pollination was detected was 600 feet in Boulder County
and 270 feet in Morgan County.
"The growth in U.S. acreage
planted with genetically modified crops has been paralleled by
growth in the demand for organically produced foods," said
Byrne. "It can be argued that both genetically modified and
organic agriculture are approaches to improving conventional
farming methods, but the two forms of agriculture are in
conflict because of U.S. organic standards that prohibit the use
of genetically modified products and pollen drift from
genetically modified crops to nearby organic fields. Given the
growing importance of both the biotechnology and organic sectors
of food production, co-existence between the two becomes a
critical issue. We hope that this study will eventually help to
establish protocols for co-existence of these two types of food
production."
This study came out of
discussions in Boulder County, where Byrne served on a committee
to study the concerns of that county's residents, particularly
those who raise organic crops, with allowing the farming of
genetically modified crops on county-owned open space land. The
study was used to establish genetically modified crop protocols
on county open space cropland. |