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Our Featured Scientist
Dr. O'Shaughnessy is currently working on Irrigation management research at the Conservation and Production Research Laboratory includes automatic irregation scheduling and control of center pivot systems using wireless sensor modules and networks.

Photo of Dr. Susan O'Shaughnessy

Calendar Events

oap

2014 OAP Workshop

Will be held March 25 and 26, 2014 in Lubbock,TX at the Overton Hotel. For more information contact David Brauer (806-356-5769; david.brauer@ars.usda.gov )

In The News

Texas Water Journal has published an article on the Day decision by the Texas Supreme Court and its potential impact on groundwater use in the state in its Vol.4, No.1 issue.
https://journals.tdl.org/twj

Projects

Center Pivot Automation and Control
Irrigation management research at the Conservation and Production Research Laboratory includes automatic irregation scheduling and control of center pivot systems using wireless sensor modules and networks. Real-time measurement of crop canopy temperature and microclimatological data are being used as inputs to calculate a daily stress index and irregation trigger for efficient use of irregation water. Contact Dr. Susan O'Shaughnessy ( Susan.OShaughnessy@ars.usda.gov) for additional information.

Photo of Dr. Susan O'Shaughnessy

CPRL Celebrated 75th Anniversary

Main BuildingDr. Stewart75th

Featured Publication

2012. Colaizzi, P. D., R. C. Schwartz, S. R. Evett, T. A. Howell, P. H. Gowda, and J. A. Tolk. 2012. Radiation model for row crops : II. Model evaluation. Agron. J. 104(2): 241-255.
Manuscript in Adobe format (2 MB).

Relatively few radiation transfer studies have considered the impact of varying vegetation cover that typifies row crops, and methods to account for partial row crop cover have not been well investigated. Our objective was to evaluate a widely used radiation model that was modified for row crops having sparse to full vegetation cover. The radiation model was combined with geometric view factors based on elliptical hedgerows that account for the spatial distribution of row crop vegetation, and this approach was compared with the more commonly used clumping index approach. Irradiance measurements included transmitted and reflected visible and shortwave, outgoing longwave, and total net radiation. The model used optimized parameters for corn (Zea mays L.), grain sorghum [Sorghum bicolor (L.) Moench], and cotton (Gossypium hirsutum L.). The elliptical hedgerow and clumping index approaches resulted in similar model agreement; however, the former resulted in up to 7.3 W m-2 smaller RMSE and up to 7.5 W m-2 smaller mean bias error compared with the latter. Both approaches resulted in similar model sensitivities to inputs, which varied +25% or -25%. Calculated shortwave irradiance fluxes were most sensitive to leaf area index (LAI; -3.25), canopy width (-1.94), ellipsoid leaf angle parameter (-0.77), and visible leaf absorption (-5.54) when LAI = 2.95 m2 m-2, and visible soil reflectance (0.89) when LAI = 0.21 m2 m-2. Calculated outgoing longwave irradiance and net radiation were most sensitive to the soil directional brightness temperature (0.55 and -0.61, respectively) when LAI = 0.21 m2 m-2.

Wetting Front

Volume 14, Number 1, December 2013

Feature Article:

75th Anniversary Celebration

Volume 14, Number 1, _December 2013(2 MB in "pdf")

New Publications

REMM Publications

2013. Buttrey, E.K., Jenkins, K.H., Lewis, J.B., Smith, S.B., Miller, R.K., Lawrence, T.E., Mccolum, F.T., Pinedo, P.J., Cole, N.A., Macdonald, J.C. 2013. Effects of 35% corn wet distillers grains plus solubles in steam-flaked and dry-rolled corn-based finishing diets on animal performance, carcass characteristics, beef fatty acid composition, and sensory attributes. Journal of Animal Science. 91:1850-1865.
Manuscript in Adobe format (4 MB)

2013. Hales, K.E., Cole, N.A., Macdonald, J.C. 2013. Effects of increasing concentrations of wet distillers grains with solubles in steam-flaked, corn-based diets of energy metabolism, carbon-nitrogen balance, and methane emissions of cattle. Journal of Animal Science. 91:819-828.
Manuscript in Adobe format (2 MB)

2013. Parker, D.B., Ham, J., Woodbury, B.L., Cai, L., Spiehs, M.J., Rhoades, M., Trabue, S.L., Casey, K., Todd, R.W., Cole, N.A. 2013. Standardization of flux chamber and wind tunnel flux measurements for quantifying volatile organic compound and ammonia emissions from area sources at animal feeding operations. Atmospheric Environment. 66:72-83.
Manuscript in Adobe format (3 MB)

2013. Parker, D.B., Ham, J., Woodbury, B.L., Cai, L., Spiehs, M.J., Rhoades, M., Trabue, S.L., Casey, K., Todd, R.W., Cole, N.A. 2013. Standardization of flux chamber and wind tunnel flux measurements for quantifying volatile organic compound and ammonia emissions from area sources at animal feeding operations. Atmospheric Environment. 66:72-83.
Manuscript in Adobe format (3 MB)

2013. Vick, B.D., Broneske, S. 2013. Effect of blade flutter and electrical loading on small wind turbine noise. Renewable Energy. 50:1044-1052.
Manuscript in Adobe format (2 MB)

2013. Vick, B.D., Moss, T.A. 2013. Adding concentrated solar power plants to wind farms to achieve a good utility electrical load match. Solar Energy. 92:298-312.
Manuscriptin Adobe format (3 MB)

SWMRU Publications

2013. Baumhardt, R.L., R.C. Schwartz, T.A. Howell, S.R. Evett and P.D. Colaizzi. Residue management effects on water use and yield of deficit irrigated cotton. Agron. J. 105(4):1026-1034.
Manuscript in Adobe format (1,027 kb)

2013. Gowda, P.H., D.J. Mulla, V. Nangia, and S. Ale. 2013. Scale effects of STATSGO and SSURGO soil databases on flow and water quality predictions. Journal of Water Resource and Protection, 5:266-274.
Manuscript in Adobe format (733 kb)

2013. Ha, W., P.H. Gowda, and T.A. Howell. 2013. A review of downscaling methods for remote sensing-based irrigation management: Part I. Irrigation Science, 31(4):831-850
Manuscript in Adobe format (611 kb)

2013. Ha, W., P.H. Gowda, and T.A. Howell. 2013. A review of potential image fusion methods for remote sensing-based irrigation management Part II. Irrigation Science, 31(4):851-869.
Manuscript in Adobe format (594 kb)

2013. Hernandez, J.E., P.H. Gowda, T.A. Howell, T.H. Marek, and W. Ha. 2013. Groundwater levels in northern High Plains: Baseline for existing agricultural management practices. Texas Water Journal, 4(1):22-34. Log Number 259169
Manuscript in Adobe format (5 MB)

2013. Senay, G.B., S. Bohms, R. Singh, P.H. Gowda, N.M. Velpuri, H. Alemu, and J. Verdin. 2013. Operational evapotranspiration mapping using remote sensing and weather datasets: A new parameterization for the SSEB approach. Journal of the American Water Resources Association, 49(3):577-591.
Manuscript in Adobe format (4 MB)