Research Brush
Control Brush control research products include the geologic mapping of the Pedernales River Watershed; modeling the effects of brush removal in the North Fork of the Upper Guadalupe River Watershed; and brush control targeting by soil characteristics in the Upper Guadalupe River Watershed New
Technologies Large concentrations of dairies in Central Texas have led to concerns about high levels of phosphorus runoff into the North Bosque River watershed. In addition, several other Texas regions are dealing with problems caused by excess concentrations of nutrients in rivers and lakes . Technologies for reducing nutrient levels in wastes from concentrated animal feeding operations and other sources need to be identified, evaluated, and field-tested. Once assessments are completed, results need to be communicated to dairy managers and other stakeholders. Phosphorus
Total Maximum Daily Load Research is under way to assess water quality impacts of nutrient imports into an urban gradient. Other studies include achieving TMDL goals in impaired watersheds through manure export in turfgrass sod. Acosta-Martinez, V., D.R. Upchurch, A.M. Schubert, and D. Porter. 2004. Early impacts of cotton and peanut cropping systems on selected chemical, physical, and microbiological properties of a sandy soil. Biology and Fertility of Soils 40(1): 44-54. Akbar, M.A., A.L. Kenimer, S.W. Searcy. 2004. Estimating Soil Profile Depth with Apprarent Electrical Conductivity for a Texas Vertisol. Trans ASAE 47(4):1087-1092. Arnold, M.A., B.J. Lesikar, G.V. McDonald, D.L. Bryan, and A. Gross. 2003. Irrigating Landscape Bedding Plants and Cut Flowers with Recycled Nursery Runoff and Constructed Wetland Treated Water. Journal of Environmental Horticulture 21(2):89-98. Assadian, N.W., C. Vogel, Z.P. Sheng, U.V. Figueroa, and M. Palomo. 2003. Heavy metal distribution in open canals and drains in the upper Rio Grande Basin. Soil & Sediment Contamination 12(3):305-323. Castiglione, P., B.P. Mohanty, P.J. Shouse, J. Simunek, M. Th. van Genuchten, and A. Santini. 2002. Lateral Water Diffusion in an Artificial Macroporous System: Modeling and Experimental Evidence. Vadose Zone Journal 2:212-221. Di Luzio, M., J.G. Arnold, and R. Srinivasan. 2004. Integration of SSURGO maps and soil parameters within a geographic information system and nonpoint source pollution model system. Journal of Soil and Water Conservation, 59(4): 123-133. Di Luzio, M., R. Srinivasan, and J.G. Arnold. 2004. A GIS-coupled hydrological model system for the watershed assessment of agricultural nonpoint and point sources of pollution. Transactions in GIS 8(1):113-136. Enciso, J.M., B.L. Unruh, P.D. Colaizzi, and W.L. Multer. 2003. Cotton Response to Subsurface Drip Irrigation Frequency under Deficit Irrigation. Applied Engineering in Agriculture 19(5):555-558. Gerik, T.J., W.D. Rosenthal, R. Vanderlip, and L.J. Wade. 2004. Predicting seed number per plant in sorghum from increments in above-ground dry weight. Agronomy Journal 96:1222-1230. Glanville, T.D., R.A. Persyn, T.L. Richard, J.M. Laflen, and P.M. Dixon. 2004. Environmental effects of applying composted organics to new highway embankments: Part 2. Water quality. Trans ASAE 47(2):471-478. Haan, P.K., and R.W. Skaggs. 2003. Effect of parameter uncertainty on DRAINMOD predictions: I. Hydrology and yield. Trans ASAE 46(4):1061-1067. Haan, P.K., and R.W. Skaggs. 2003. Effect of parameter uncertainty on DRAINMOD predictions: II. Nitrogen loss. Trans ASAE 46(4):1069-1075. Hanzlik, J.E., C.L. Munster, A. McFarland, D.M. Vietor, and R.H. White. 2004. GIS analysis to identify turfgrass sod production sites for phosphorus removal. Trans ASAE 47(2):453-461. Harmel, D.R., H.A. Torbert, A.L. Kenimer, and S.W. Searcy. 2004. Nitrogen losses as impacted byprecision application. Precision Agriculture 5(3):247-261. Jacobs, J.M., Binayak P. Mohanty, En-Ching Hsu, Douglas Miller. 2004. SMEX02: Field Scale Variability, Time Stability, and Similarity of Soil Moisture. Remote Sensing of Environment 92(2004): 436-446. Jayakrishnan, R., R. Srinivasan, and J. G. Arnold, 2004. Comparison of Raingauge and WSR-88D Stage III Precipitation Data over the Texas-Gulf River Basin. Journal of Hydrology. 292(2004) 135-152. Kohne, J.M., Binayak P. Mohanty, Jirka Simunek, and Horst H. Gerke. 2004. Numerical evaluation of a second-order water transfer term for variably saturated dual-permeability models. Water Resources Research 40(7):WO7409; 14pp. Li, J.H., W.A. Dugas, G.J. Hymus, D.P. Johnson, B.G. Drake, and B.A. Hungate. 2003. Direct and indirect effects of elevated CO2 on transpiration from Quercus myrtifolia in a scrub-oak ecosystem. Global Change Biology 9(1):96-105. Moon, J., R. Srinivasan, J.H. Jacobs. 2004. Stream Flow Estimation Using Spatially Distributed Rainfall in the Trinity River Basin, Texas. Trans ASAE 47(2): 471-478. Mukhtar, S., A.L. Kenimer, S.S. Sadaka, and J.G. Mathis. 2003. Evaluation of bottom ash and composted manure blends as a soil amendment material. Bioresource Technology 89(3):217-228. Narasimhan, B., R. Srinivasan, and A.D. Whittaker. 2003. Estimation of potential evapotranspiration from NOAA-AVHRR satellite. Applied Engineering in Agriculture 19(3):309-318. Paul, S., P.K. Haan, M.D. Matlock, S. Mukhtar, and S.D. Pillai. 2004. Analysis of the HSPF water quality parameter uncertainty in predicting peak in-stream fecal coliform concentrations. Trans ASAE 47(1):69-78. Persyn, R.A., T.D. Glanville, T.L. Richard, J.M. Laflen, and P.M. Dixon. 2004. Environmental effects of applying composted organics to new highway embankments: Part 1. Interrill runoff and erosion. Trans ASAE 47(2):463-469. Sheng, Z.P., D.C. Helm, and J. Li. 2003. Mechanisms of earth fissuring caused by groundwater withdrawal. Environmental & Engineering Geoscience 9(4):351-362. Sweeten, J.M., K. Annamalai, B. Thien, and L.A. McDonald. 2003. Co-firing of coal and cattle feedlot biomass (FB) fuels. Part I. Feedlot biomass (cattle manure) fuel quality and characteristics. Fuel 82(10):1167-1182. Vega, E., B. Lesikar, and S.D. Pillai. 2003. Transport and survival of bacterial and viral tracers through submerged-flow constructed wetland and sand-filter system. Bioresource Technology 89(1):49-56. Whittaker, G., R. Fare, R. Srinivasan, and D.W. Scott. 2003. Spatial evaluation of alternative nonpoint nutrient regulatory instruments. Water Resources Research 39(4): WR001119; 9 pp. Zhu, J., and B.P. Mohanty. 2003. Effective hydraulic parameters for steady state vertical flow in heterogeneous soils. Water Resources Research 39(8):121-1212. Zhu,
J., B.P. Mohanty, Arthur
W. Warrick,
and Martinus
Th. van Genuchten.
2004.
Correspondence
and Upscaling
of Hydraulic
Functions
for Steady-State
Flow in Heterogeneous
Soild.
Vadose
Zone Journal
3:527-533.
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