Search Results - "Harper, L.A."

Micrometeorological techniques for measurement of enteric greenhouse gas emissions by Harper, L.A., Denmead, O.T., Flesch, T.K.

“…Measurement of greenhouse gas (GHG) emissions is a challenge to the animal industry as it is difficult to accurately measure enteric emissions from ruminants…”
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Using infrared thermography to determine changes in teat skin surface temperature after machine milking in dairy cows by Harper, L.A., DiLeo, C., Basran, P.S., Wieland, M.

“…[Display omitted] •Infrared thermography can measure skin surface temperature.•Teat skin surface temperatures were obtained from the hind teats before and…”
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Determining ammonia emissions from a cattle feedlot with an inverse dispersion technique by Flesch, T.K., Wilson, J.D., Harper, L.A., Todd, R.W., Cole, N.A.

“…An inverse-dispersion technique is used to calculate ammonia (NH 3) gas emissions from a cattle feedlot. The technique relies on a simple backward Lagrangian…”
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Ammonia emissions from dairy production in Wisconsin by Harper, L A, Flesch, T K, Powell, J M, Coblentz, W K, Jokela, W E, Martin, N P

“…Ammonia gas is the only significant basic gas that neutralizes atmospheric acid gases produced from combustion of fossil fuels. This reaction produces an…”
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Ammonia emissions from broiler production in the San Joaquin Valley by Harper, L.A, Flesch, T.K, Wilson, J.D

“…Ammonia is the primary basic gas in the atmosphere and has the most important role in the neutralization of atmospheric acids generated by fossil fuel…”
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The use of ultrasonography in the transition period to estimate adipose tissue depots and their association with risk of early postpartum hyperketonemia in Holstein dairy cattle by Westhoff, T.A., Rodger, M., Wieland, M., Harper, L.A., Stabell, A.J., Van Althuis, M.E., Mann, S.

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approach for measuring methane emissions from whole farms by McGinn, S.M, Flesch, T.K, Harper, L.A, Beauchemin, K.A

“…Estimates of enteric methane (CH4) emissions from ruminants are typically measured by confining animals in large chambers, using head hoods or masks, or by a…”
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Nitrogen use efficiency and nitrogen budget for conservation tilled wheat by Sharpe, R.R, Harper, L.A, Giddens, J.E, Langdale, G.W

“…The understanding of nitrogen (N) cycling in the soil-plant-atmosphere is necessary to maximize N use efficiency and to develop N budgets for wheat (Triticum…”
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Ammonia volatilization from surface-applied poultry litter under conservation tillage management practices by Sharpe, R.R, Schomberg, H.H, Harper, L.A, Endale, D.M, Jenkins, M.B, Franzluebbers, A.J

“…Land application of poultry litter can provide essential plant nutrients for crop production, but ammonia (NH3) volatilization from the litter can be…”
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Nitrogen cycling through swine production systems: ammonia, dinitrogen, and nitrous oxide emissions by Harper, L.A, Sharpe, R.R, Parkin, T.B, Visscher, A. de, Cleemput, O. van, Byers, F.M

“…Ammonia (NH3) emissions from animal systems have become a primary concern for all of livestock production. The purpose of this research was to establish the…”
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Erratum to “Ammonia concentrations downstream of broiler operations” (J. Appl. Poult. Res. 18:630–639) by Fairchild, B.D., Czarick, M., Harper, L.A., Worley, J.W., Ritz, C.W., Hale, B.D., Naeher, L.P.

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Ammonia emissions from swine waste lagoons in the Utah Great Basin by Harper, L.A, Weaver, K.H, Dotson, R.A

“…In animal production systems (poultry, beef, and swine), current production, storage, and disposal techniques present a challenge to manage wastes to minimize…”
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Methane emissions from an anaerobic swine lagoon by Sharpe, R.R., Harper, L.A.

“…Gaseous methane (CH 4) emissions from a swine waste holding lagoon were determined periodically during the year. Micrometeorological techniques were used in…”
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Ammonia concentrations downstream of broiler operations by Fairchild, B.D., Czarick, M., Harper, L.A., Worley, J.W., Ritz, C.W., Hale, B.D., Naeher, L.P.

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Ammonia emissions from swine houses in the southeastern United States by Harper, L.A, Sharpe, R.R, Simmons, J.D

“…Ammonia (NH3) from confined animal feeding operations is emitted from several sources including lagoons, field applications, and houses. This paper presents…”
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A mass balance method for non-intrusive measurements of surface-air trace gas exchange by Denmead, O.T., Harper, L.A., Freney, J.R., Griffith, D.W.T., Leuning, R., Sharpe, R.R.

“…A mass balance method is described for calculating gas production from a surface or volume source in a small test plot from measurements of differences in the…”
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Identifying sources and sinks of scalars in a corn canopy with inverse Lagrangian dispersion analysis by Harper, L.A, Denmead, O.T, Sharpe, R.R

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Identifying sources and sinks of scalars in a corn canopy with inverse Lagrangian dispersion analysis by Denmead, O.T, Harper, L.A, Sharpe, R.R

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Ammonia and nitrous oxide emissions from sprinkler irrigation applications of swine effluent by Sharpe, R.R, Harper, L.A

“…In the USA, swine operations produce more than 14 Tg of manure each year. About 30% of this manure is stored in anaerobic lagoons before effluent applications…”
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Methane emissions from swine lagoons in Southeastern US by Sharpe, R.R., Harper, L.A., Byers, F.M.

“…Concentrated animal production can have a significant effect on the atomospheric environment. Methane (CH 4) emissions from two swine waste holding lagoons…”
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