No-till could help maintain crop yields despite climate change

Aug 23, 2012

Reducing tillage for some Central Great Plains crops could help conserve water and reduce losses caused by climate change, according to studies at the U.S. Department of Agriculture (USDA).

Research leader Laj Ahuja and others at the Agricultural Research Service (ARS) Research Unit at Fort Collins, Colo., superimposed climate projections onto 15 to 17 years of field data to see how future might be affected. ARS is USDA's chief intramural scientific research agency, and this work supports the USDA priority of responding to climate change.

The field data was collected at the ARS Central Great Plains Research Station in Akron, Colo. The projections included an increase in equivalent (CO2) levels from 380 parts per million by volume (ppmv) in 2005 to 550 ppmv in 2050. The projections also included a 5-degree Fahrenheit increase in in Colorado from 2005 to 2050. The ARS scientists used these projections to calculate a linear increase of CO2 and temperature from 2050 to 2100.

Ahuja's team used the Water Quality Model (version 2) for of wheat-fallow, wheat-corn-fallow, and wheat-corn-millet to see how yields might be affected in the future. They simulated different combinations of three climate change projections: rising CO2 levels, rising temperatures, and a shift in precipitation from late spring and sum¬mer to fall and winter. They ran the model with the projected climate for each of the 15 to 17 years of field crop data for each cropping system.

When the researchers used all three climate factors to generate yield projections from 2005 to 2100, the yield estimates for the three cropping systems dropped over time. Declines in corn and millet yields were more significant than declines in wheat yields.

Ahuja also simulated earlier planting dates and no-till management to see if either change reduced yield losses, but only the no-till option helped. In the wheat-fallow rotation with no tillage, wheat yields were higher than with conventional tillage through 2075. But by 2100, when summer temperatures had increased by 8 degrees F, even the no-till yield advantage was lost.

The results from this work were published in Climatic Change in 2012.

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Billybaroo
not rated yet Aug 23, 2012
Not gonna happen as long as corn prices remain high and the Fed keeps their ethanol production requirements.
Howhot
not rated yet Aug 28, 2012
Fed keeps their ethanol production requirements.

The Feds gave up the ethanol production requirements for this year because of the drought(s). Thanks to Obama. Now move along.