ARS soil scientist Rodney Venterea (foreground) and technician Jason Leonard collect gas samples from chambers used to measure flux of nitrous oxide and other greenhouse gases from experiments in a corn field in Becker, Minnesota. Agricultural practices, particularly the use of nitrogen-based fertilizers, generate significant levels of the greenhouse gas nitrous oxide (N O). But the mechanisms behind these emissions are still nebulous, and some studies suggest that N O emissions may be underestimated by as much as 40 percent at some sites. “We need to know much more about how agricultural practices affect the production and consumption of greenhouse gases, including N O,” says microbiologist Tim Parkin, who works at the Air Quality of Agricultural Systems Research Unit in Ames, Iowa. Scientists already know that N O emissions rise as the applications of nitrogen-based fertilizers increase. Parkin and his Ames colleagues collaborated with scientists from AgCert International Limited under a cooperative research and development agreement to learn more about how different soils and fertilizers affect N The team used chamber studies to assess variation in the emissions of N O, carbon dioxide, and methane from a sandy loam mix and a clay soil. The fertilizers used were urea-ammonium nitrate (UAN) and a swine manure slurry. The researchers
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Fuel additives are chemical substances that are added to gasoline, diesel, kerosene and other fuels to impart or improve certain properties.
Electronic and Semiconductor Gases
Electronic and semiconductor gases are specialized for microelectronic manufacturing or semiconductor processing applications such as thin film deposition (CVD, PVD), etching, RTP, packaging or soldering.
Industrial gases are pure elements, molecular compounds or mixtures that are gaseous or vaporous at room temperature and pressure.
Spectroradiometers are used to measure the spectral power distributions of light sources, monitors, and other illuminants.
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Plant physiologist Jack Morgan (left) and soil scientist Ron Follett (right) discuss research projects at ARS GRACEnet sites across the United States while physical science technician Ed Buenger...
Chemist Dick Pfeiffer uses a gas chromatograph/mass spectrometer to analyze compounds in odors collected from a swine production facility. Complaints about nuisance livestock odor in rural areas have...
Natural gas is used primarily as a fuel and as a raw material in manufacturing. It is used in home furnaces, water heaters, and cooking stoves. As an industrial fuel, it is used in...
Soil scientist Matias Vanotti monitors conditions in a bioreactor that uses immobilized bacteria to remove nitrates from agricultural effluents. In 2006, farmers in North and South Carolina earned...
Plant physiologists Kent Burkey (left) and Fitzgerald Booker collect soybean leaf samples in open-top field chambers for analysis of the effects of elevated carbon dioxide and ozone on plant...