By Sharon Omahen
University of Georgia
What global warming will really do to farm crops isn’t a
speculative study for some scientists. On a tiny scale in
Georgia, they’re seeing the effects for themselves.
The Georgia Envirotron in Griffin, Ga., makes what-if studies
come alive for University of Georgia and visiting scientists.
They can see, among other things, how a simultaneous rise in
temperature and carbon dioxide might affect many food crops.
“Using the Envirotron’s controlled-atmospheric chambers,
researchers can actually see how global warming will affect
agriculture,” said Envirotron manager Ian Flitcroft.
Flitcroft is an agricultural research engineer with the UGA
College of Agricultural and Environmental Sciences.
Controlling temperature, humidity and light
Opened in 1998, the $1.26 million Envirotron allows researchers
to study how a number of stresses affect plants. They’re able to
control temperature, humidity, carbon dioxide and light. And they
can subject
plants to the stresses of air pollutants and other atmospheric
gases.
With indoor growth chambers, they study plants, pests and
diseases in a precisely controlled environment. Greenhouses allow
them to simulate field conditions.
UGA researchers are using the Envirotron’s controlled environment
chambers to look at Georgia-grown crops.
A team of UGA agricultural engineers is studying Georgia peanuts.
They’re looking at how rising temperatures affect peanut
varieties grown here. They’re also
studying the effects of global warming on the viability of
Georgia-grown peanut varieties.
“A group of UGA horticulturists is using the chambers to study
blueberry fertilization,” Flitcroft said.
Chambers cut off from the rest of the world let the group control
pollination. They can tell the differences between
self-fertilization and cross-fertilization. And they can see how
fertilization timing affects the quality of blueberries.
The chamber temperature can be set to delay flowering until
researchers are ready to begin an experiment. Then the
temperature and day length can be manipulated to induce
flowering, Flitcroft said.
Studying a host of crops
Two scientists from Mexico and one from South Korea are using the
UGA facility to investigate crops grown in their countries.
“The Korean scientist is interested in cotton,” Flitcroft said.
“The Mexican researchers are looking at how rising temperatures
will affect maize, soybeans and dry beans grown in their
country.”
UGA engineers are using the Envirotron, too, to test a
computer model they’ve developed to simulate crop
growth and to predict yield.
“They’re using the growth chambers to see if the actual results
match their model’s predictions,” Flitcroft said. “If the results
prove the model effective, they can begin promoting the model (to
farmers).”
Checking results in the Envirotron helps the researchers pinpoint
parts of their model that may need improving, too.
Other scientists use the Envirotron as a testing ground for new
crops. A visiting scientist from Iran is using the facility to
predict how well sesame will grow in Georgia.
“He wants to determine at which temperatures it will grow best,”
Flitcroft said, “to see which varieties will grow best for
conditions in Georgia where sesame currently is an unknown crop.”
Trials of these projects should be completed by the end of June.
The researchers will then begin compiling their data and
documenting their findings.
“We try to schedule the test plots during the winter,” Flitcroft
said. “It is much less expensive to operate the Envirotron’s
chambers. Our power bill runs about $4,000 a month in the winter,
compared to $10,000 a month in the summer.”
