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Author Topic: Not so great now huh?  (Read 737 times)

Offline Jerrymac

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Not so great now huh?
« on: April 14, 2009, 05:13:44 PM »

Corn, soy yields gain little from genetic engineering: study
58 mins ago

WASHINGTON (AFP) – The use of genetically engineered corn and soybeans in the United States for more than a decade has had little impact on crop yields despite claims that they could ease looming food shortages, a study released on Tuesday concluded.

"A hard-nosed assessment of this expensive technology's achievements to date gives little confidence that it will play a major role in helping the world feed itself in the forseeable future," said the report by the Union of Concerned Scientists.

The study evaluated the effect on corn and soybean crop yields of genetically engineered varieties commercialized in the United States over the past 13 years, examining peer-reviewed academic studies that date back to the early 1990s.

"Based on that record, we conclude that GE (genetic engineering) has done little to increase overall crop yields," it said.

The report said genetically engineered soybeans account for 90 percent of soybeans grown in the United States, while genetically engineered corn accounts for 63 percent of the US corn crop.

"Overall, corn and soybean yields have risen substantially over the last 15 years, but largely not as a result of the GE traits," the report said. "Most of the gains are due to traditional breeding or improvement of other agricultural practices."

It found that corn and soybeans that were genetically modified to increase their tolerance to herbicides "have not increased operational yields, whether on a per acre or national basis, compared to conventional methods that rely on other available herbicides."

Corn modified with genes from Bt, or Bacillus thuringienisis, bacteria for resistance to several kinds of insects did provide higher yields, but the study estimated the increase at between 0.2 and 0.3 percent a year on average over the past 13 years.

Overall corn yields in the United States have increased an average of about one percent a year, it said.

"More specifically, US Department of Agriculture data indicate that the average corn production per acre nationwide over the past five years (2004-2008) was about 28 percent higher than for the five-year period 1991-1995," it said.

"But our analysis of specific yield studies concludes that only 4-5 percent of that increase is attributable to Bt, meaning an increase of about 24-25 percent must be due to other factors such as conventional breeding," it said.
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Offline kathyp

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Re: Not so great now huh?
« Reply #1 on: April 14, 2009, 06:30:41 PM »
i'd like to see a study done by a group that doesn't have an agenda.  that might be asking a lot, but it's hard to evaluate a report from a group like this. 

i have to admit to a knee jerk negative reaction to a group that on one page blindly embraces global warming, and on another warns strongly about the dangers of nuclear power.

kind of reminds me of the attempted destruction of Reardon Steel  ;)
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Offline reinbeau

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Re: Not so great now huh?
« Reply #2 on: April 15, 2009, 12:13:54 PM »
Well, Kathy, I don't believe in the religion of global warming, and I'm all for nuclear power, but I'm sorry, GM plants are nothing more than a moneymaker for the developers, they aren't necessary, and have so far caused more harm than good for the American food supply (I don't give a fig about feeding the world, I just want the US to eat good quality food).  It isn't a liberal thing to want big agribusiness out of our food chain. 

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