Accuracy and precision of no instrument is guaranteed
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The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.
History
The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.
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1902–present
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- Department of Farm Crops and Soils (1917–1935)
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- College of Agriculture and Life Sciences (parent college)
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Abstract
Photoacoustic infrared spectroscopy (PAS) is increasingly used for measurement of N2O and CO2 fluxes at the soil surface. However, PAS calibration is complex. Water vapor, CO2, and temperature interfere with accurate N2O measurement. To accurately measure N2O, PAS calibrations must compensate for these interferences. Our article, ‘Evaluation of photoacoustic infrared spectroscopy for the simultaneous measurement of N2O and CO2 gas concentrations and fluxes at the soil surface’ (Iqbal et al., 2013), compared PAS and gas chromatography (GC) analytical procedures. Results demonstrated that PAS can measure N2O concentrations (ca. 0.5–3.0 ppm) and fluxes (ca. 0.5–5.0 ppm min−1) with accuracy and precision similar to GC without interferences from H2O vapor or CO2 concentrations typically encountered in static flux chambers at the soil surface.
Comments
This article is published as Iqbal J, Castellano MJ, Parkin TB. 2014. Accuracy and precision of no instrument is guaranteed. Global Change Biology doi: 10.1111/gcb.12446. Posted with permission.