By Dennis O’Brien
March 28, 2013
U.S. Department of Agriculture (USDA) scientists and their partners are providing guidance to growers in Montana and the Dakotas on how they can use some tried-and-true agricultural practices to reduce their climate change footprint.
Upendra Sainju and his colleagues with the Agricultural Research Service (ARS) in Sidney, Mont., have been studying how no-till systems, crop rotation and other approaches can reduce greenhouse gas emissions, sustain crop yields and cut back on the use of nitrogen fertilizer that pollutes the air and water. ARS is USDA’s principal intramural scientific research agency, and this research supports the USDA priority of responding to climate change.
Agriculture contributes about 25 percent of the carbon dioxide produced by humans and 70 percent of the similarly produced nitrous oxide being released into the atmosphere. Tillage, cropping sequences, crop-fallow management practices, and the use of nitrogen fertilizers all play significant roles in those emissions.
The researchers evaluated the effects of irrigation, tillage, cropping systems, and nitrogen fertilization on greenhouse gas emissions from five cropping systems in sandy loam soil in western North Dakota, where growers can irrigate fields.
They also studied three cropping systems in loam soil in eastern Montana where irrigation is not usually an option. They raised conventionally tilled malt barley with and without nitrogen fertilizer, no-till malt barley with and without fertilizer, and a no-till malt barley-pea rotation with and without fertilizer. Some systems were irrigated and others were not, and the researchers tracked soil temperatures and soil water content, measured plant biomass, and used static, vented chambers to measure greenhouse gases.
Learn more at the following link! via Battling Climate Change with Tried and True Methods / March 28, 2013 / News from the USDA Agricultural Research Service.