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Heidi M Waldrip (PhD)
Livestock Nutrient Management Research
Research Soil Scientist

Phone: (806) 356-5764
Fax: (806) 356-5750
Room 6

CONSERVATION & PRODUCTION RESEARCH LAB
P.O. DRAWER 10 (2300 EXPERIMENT STATION RD-SHIP)
BUSHLAND, TX 79012
Projects
Improved Practices to Conserve Air Quality, Maintain Animal Productivity, and Enhance Use of Manure and Soil Nutrients of Cattle Production Systems for the Southern Great Plains
In-House Appropriated (D)
  Accession Number: 431554
Assessing Long-term Agronomic and Soil-health Impacts of Land-applied Dairy Cattle Manure
Non-Assistance Cooperative Agreement (S)
  Accession Number: 438901
Assessing Greenhouse Gas Emissions from Open-lot Dairies and Land-applied Dairy Cattle Manure
Non-Assistance Cooperative Agreement (S)
  Accession Number: 438925

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
The effect of plant tannins on methane and nitrous oxide emissions from dairy manure under laboratory conditions - (Abstract Only)
Min, B., Parker, D.B., Casey, K., Willis, W.M., Castleberry, B., Meyer, B.E., Robbe, H.A., Waldrip, H. 2020. The effect of plant tannins on methane and nitrous oxide emissions from dairy manure under laboratory conditions [abstract]. Virtual Annual Meeting and Trade Show, 2020 ASAS-CSAS-WSASAS, July 19-23, 2020. Paper No. PSXI-25.
Prevalence of antibiotic resistance genes and bacterial community diversity from feces of pasture-raised broiler and layer chickens, swine, and beef cattle in the Southeastern USA - (Abstract Only)
Min, B., Castleberry, B., Rothrock Jr, M.J., Lee Rutherford, L., Waldrip, H., Parker, D.B., Brauer, D.K., Pitta, D.W., Indugu, N. 2020. Prevalence of antibiotic resistance genes and bacterial community diversity from feces of pasture-raised broiler and layer chickens, swine, and beef cattle in the Southeastern USA [abstract]. 2020 ASAS-CSAS-WSASAS Virtual Annual Meeting and Trade Show, July 19-23, 2020. Paper No. PSXI-23.
Dietary mitigation of enteric methane emissions from ruminants: A review of plant tannin mitigation options Reprint Icon - (Peer Reviewed Journal)
Min, B., Solaiman, S., Waldrip, H., Parker, D.B., Todd, R.W., Brauer, D.K. 2020. Dietary mitigation of enteric methane emissions from ruminants: A review of plant tannin mitigation options. Animal Nutrition. 6(2020)231-246. https://doi.org/10.1016/j.aninu.2020.05.002.
Towards modeling of nitrous oxide emissions following precipitation, urine and feces deposition on beef cattle feedyard surfaces - (Peer Reviewed Journal)
Preface of animal manure: production, characteristics, environmental concerns and management Reprint Icon ()
Pagliari, P., He, Z., Waldrip, H.M. 2020. Preface. In: Waldrip, H.M., Pagliari, P.H., He, Z., editors. Animal Manure: Production, Characteristics, Environmental Concerns and Management. ASA Special Publication 67. Madison, WI: ASA and SSSA. p. i-vii. https://doi.org/10.2134/asaspecpub67.frontmatter.
Advances and outlook of manure production and management Reprint Icon ()
He, Z., Pagliari, P., Waldrip, H.M. 2020. Advances and outlook of manure production and management. In: Waldrip, H.M., Pagliari, P.H., He, Z., editors. Animal Manure: Production, Characteristics, Environmental Concerns and Management. ASA Special Publication 67. Madison, WI: ASA and SSSA. p. 373-383. https://doi.org/10.2134/asaspecpub67.c28.
Selected soil antibiotic resistance gene profile changes following manure application and rainfall Reprint Icon - (Peer Reviewed Journal)
Meyers, M.A., Durso, L.M., Gilley, J.E., Waldrip, H., Castleberry, B., Millmier, S.A. 2020. Selected soil antibiotic resistance gene profile changes following manure application and rainfall. Environmental Quality. 49(3):754–761. https://doi.org/10.1002/jeq2.20060.
Associative effects of wet distiller's grains, plus solubles and tannin-rich peanut skin supplementation on in vitro rumen fermentation, greenhouse gas emissions, and microbial changes Reprint Icon - (Peer Reviewed Journal)
Min, B., Castleberry, B., Allen, H.K., Parker, D.B., Waldrip, H., Brauer, D.K., Willis, W.M. 2019. Associative effects of wet distiller's grains, plus solubles and tannin-rich peanut skin supplementation on in vitro rumen fermentation, greenhouse gas emissions, and microbial changes. Journal of Animal Science. 97(11):4668-4681. https://doi.org/10.1093/jas/skz317.
Nitrous oxide emissions from an open-lot beef cattle feedyard in Texas Reprint Icon - (Peer Reviewed Journal)
Parker, D.B., Casey, K.D., Waldrip, H.M., Min, B.R., Woodbury, B.L., Spiehs, M.J., Willis, W. 2019. Nitrous oxide emissions from an open-lot beef cattle feedyard in Texas. Transactions of the ASABE. 62(5):1173-1183. https://doi.org/10.13031/trans.13396.
How does long-term crop management affect soil organic matter in the Texas High Plains? - (Abstract Only)
Waldrip, H., Schwartz, R.C., He, Z., Todd, R.W., Baumhardt, R.L., Parker, D.B., Zhang, M. 2019. How does long-term crop management affect soil organic matter in the Texas High Plains? [abstract]. 74th SWCS International Annual Conference, July 28-31, 2019, Pittsburg, Pennsylvania. Paper No. 14.
Modern animal manure management: production, characteristics, and environmental concerns - (Abstract Only)
Waldrip, H., He, Z., Pagliari, P. 2019. Modern animal manure management: production, characteristics, and environmental concerns [abstract]. ASA-CSSA-SSSA International Annual Meeting, November 10-13, 2019, San Antonio, TX. Paper No. 40-5.
Nitrogen and phosphorus characteristics of beef and dairy manure ()
Pagliari, P., Wilson, M., Waldrip, H., He, Z. 2019. Nitrogen and phosphorus characteristics of beef and dairy manure. In: Waldrip, H.M., Pagliari, P.H., He, Z., editors. Animal Manure: Production, Characteristics, Environmental Concerns, and Management. ASA Special Publication 67. Madison, WI: American Society of Agronomy and Soil Science Society of America. p. 45-62.
Associative effect of wet-distiller's grain plus soluble and tannin-rich peanut skin supplementation on in vitro rumen fermentation, greenhouse gas emissions, and microbiome changes - (Abstract Only)
Empirical model of annual nitrous oxide emissions from open-lot beef cattle feedyard pens (Version 2) - (Proceedings)
Parker, D.B., Casey, K.D., Cortus, E.L., Min, B., Waldrip, H., Woodbury, B.L., Spiehs, M.J. 2019. Empirical model of annual nitrous oxide emissions from open-lot beef cattle feedyard pens (Version 2). In: Proceedings of the 2019 ASABE Annual International Meeting, July 5-7, 2019, Boston, Massachusetts. Paper No. 1900299. p. 1-18.
Whole farm modeling: A systems approach to understanding and managing livestock for greenhouse gas mitigation, economic viability and environmental quality ()
Ahmed, M., Ahmad, S., Waldrip, H., Ramin, M., Raza, M. 2019. Whole farm modeling: A systems approach to understanding and managing livestock for greenhouse gas mitigation, economic viability and environmental quality. In: Waldrip, H.M., Pagliari, P.H., He, Z., editors. Animal Manure: Production, Characteristics, Environmental Concerns, and Management. ASA Special Publication 67. Madison, WI: American Society of Agronomy and Soil Science Society of America. p. 345-371.
Balancing personal-professional responsibilities Reprint Icon ()
Sengupta, A., Waldrip, H. 2018. Balancing personal-professional responsibilities. CSA News. 63(12):36-38. https://doi.org/10.2134/csa2018.63.1226.
Nitrous oxide from beef cattle feedyards: Understanding effects of microbial community structure, climate and manure properties - (Abstract Only)
Diurnal measurements of methane emissions from a feedyard pen surface in Texas during Spring - (Abstract Only)
Empirical model of annual nitrous oxide emissions from open-lot beef cattle feedyard pens in the southern high plains - (Proceedings)
Parker, D.B., Cortus, E.L., Casey, K.D., Marek, G.W., Heflin, K.R., Waldrip, H. 2018. Empirical model of annual nitrous oxide emissions from open-lot beef cattle feedyard pens in the southern high plains [abstract]. ASABE Annual International Meeting. Paper #1800508.
Tetracycline and sulfonamide antibiotic resistance genes in soils from Nebraska organic farming operations Reprint Icon - (Peer Reviewed Journal)
Cadenas, M., Durso, L.M., Miller, D.N., Waldrip, H., Castleberry, B., Drijber, R.A., Wortman, C. 2018. Tetracycline and sulfonamide antibiotic resistance genes in soils from Nebraska organic farming operations. Frontiers in Microbiology. 9:1283.
How do temperature and rainfall affect nitrous oxide emissions from open-lot beef cattle feedyard pens? Reprint Icon - (Peer Reviewed Journal)
Parker, D.B., Waldrip, H., Casey, K.D., Woodbury, B.L., Spiehs, M.J., Webb, K., Willis, W.M. 2018. How do temperature and rainfall affect nitrous oxide emissions from open-lot beef cattle feedyard pens? Transactions of the ASABE. 61(3): 1049-1061. doi:10.13031/trans.12788.
Identifying challenges and opportunities for improved nutrient management through U.S.D.A's Dairy Agroecosystem Working Group Reprint Icon - (Peer Reviewed Journal)
Holly, M.A., Kleinman, P.J., Bryant, R.B., Bjorneberg, D.L., Church, C., Baker, M.E., Boggess, M.V., Chintala, R., Feyereisen, G.W., Gamble, J.D., Leytem, A.B., Reed, K., Rotz, C.A., Vadas, P.A., Waldrip, H., Brauer, D.K. 2018. Identifying challenges and opportunities for improved nutrient management through U.S.D.A's Dairy Agroecosystem Working Group. Journal of Dairy Science. 101:1-10. https://doi.org/10.3168/jds.2017-13819.
Identifying challenges and opportunities for improved nutrient management through U.S.D.A's Dairy Agroecosystem Working Group Reprint Icon - (Peer Reviewed Journal)
Holly, M.A., Kleinman, P.J., Bryant, R.B., Bjorneberg, D.L., Rotz, C.A., Baker, J.M., Boggess, M.V., Brauer, D.K., Chintala, R., Feyereisen, G.W., Gamble, J.D., Leytem, A.B., Reed, K., Vadas, P.A., Waldrip, H. 2018. Identifying challenges and opportunities for improved nutrient management through U.S.D.A's Dairy Agroecosystem Working Group. Journal of Dairy Science. 101(7):6632-6641. https://doi.org/10.3168/jds.2017-13819.
Nitrous oxide from beef cattle feedyards: Understanding effects of microbial community structure, climate and manure properties on denitrification - (Abstract Only)
Waldrip, H., Parker, D.B., Miller, S., Miller, D.N., Durso, L.M., Casey, K., Todd, R.W., Cortus, E. 2018 [abstract]. Nitrous oxide from beef cattle feedyards: Understanding effects of microbial community structure, climate and manure properties on denitrification. ASABE Annual International Meeting. Paper #1801295.
Phosphorus distribution in soils treated with bioenergy co-product materials following corn growth Reprint Icon - (Peer Reviewed Journal)
Pagliari, P.H., Strock, J.S., Johnson, J.M., Waldrip, H. 2018. Phosphorus distribution in soils treated with bioenergy co-product materials following corn growth. Agronomy Journal. 110(3):850-858. doi:10.2134/agronj2017.04.0239.
Unscrambling nitrous oxide production in beef cattle feedyard manure: Effect of temperature and water content on denitrification rates - (Abstract Only)
Impact of management practices on water extractable organic carbon and nitrogen from 12-year poultry litter amended soils - (Peer Reviewed Journal)
He, Z., Zhang, M., Zhao, A., Waldrip, H.M., Pagliari, P.H., Harmel, R.D. 2017. Impact of management practices on water extractable organic carbon and nitrogen from 12-year poultry litter amended soils. Open Journal of Soil Science. 7:259-277.
Temporal nitrous oxide emissions from beef cattle feedlot manure following a simulated rainfall event - (Peer Reviewed Journal)
Parker, D.B., Waldrip, H., Casey, K.D., Todd, R.W., Willis, W.M., Webb, K. 2017. Temporal nitrous oxide emissions from beef cattle feedlot manure following a simulated rainfall event. Journal of Environmental Quality. 46:733-740 doi:10.2134/jeq2017.02.0042.
Nitrous oxide emissions from southern high plains beef cattle feedyards: Measurement and Modeling Reprint Icon - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Parker, D.B., Casey, K.D. 2017. Nitrous oxide emissions from southern high plains beef cattle feedyards: Measurement and modeling. Transactions of the ASABE. 60: 1209-1221. doi: 10.13031/trans.12085.
How well do we understand nitrous oxide emissions from open-lot cattle systems? - (Proceedings)
Waldrip, H., Casey, K., Todd, R.W., Parker, D.B., Rotz, C.A., Cole, N.A. 2017. How well do we understand nitrous oxide emissions from open-lot cattle systems?. Waste to Worth Conference. Pg. 74413. Available at https://articles.extension.org/pages/74413/how-well-do-we-understand-nitrous-oxide-emissions-from-open-lot-cattle-systems.
Diurnal variation in greenhouse fluxes from a feedyard pen surface - (Abstract Only)
Improved chamber systems for rapid, real-time nitrous oxide emissions from manure and soil - (Peer Reviewed Journal)
Parker, D.B., Todd, R.W., Waldrip, H., Webb, K., Willis, W.M., Meyer, B.E., Marek, G.W., Casey, K.D., Auvermann, B., Marek, T., Pemberton, B. 2017. Improved chamber systems for rapid, real-time nitrous oxide emissions from manure and soil. Transactions of the ASABE. 60:(4)1235-1258. doi:10.13031/trans.1215a.
Spatial variability in nitrous oxide and methane emissions from beef cattle feedyard pen surfaces - (Abstract Only)
Casey, K., Waldrip, H., Parker, D.B., Todd, R.W. 2017. Spatial variability in nitrous oxide and methane emissions from beef cattle feedyard pen surfaces. Waste to Worth Conference, April 18-21, 2017, Raleigh, NC.
Applied and environmental chemistry of animal manure: A review ()
He, Z., Pagliari, P.H., Waldrip, H.M. 2016. Applied and environmental chemistry of animal manure: A review. Pedosphere. 26:779-816.
Urease inhibitor for reducing ammonia emissions from an open-lot beef cattle feedyard in the Texas High Plains - (Peer Reviewed Journal)
Parker, D.B., Rhoades, M.B., Koziel, J.A., Baek, B., Waldrip, H., Todd, R.W. 2016. Urease inhibitor for reducing ammonia emissions from an open-lot beef cattle feedyard in the Texas High Plains. Applied Engineering in Agriculture. 32(6):823-832. doi:10.13031/aea.32.11897.
Nitrous oxide emissions from open-lot cattle feedyards: A review - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Parker, D.B., Cole, N.A., Rotz, C.A., Casey, K. 2016. Nitrous oxide emissions from open-lot cattle feedyards: A review. Journal of Environmental Quality. doi:10-2134/JEQ2016.04.0140.
Reactive N emissions from beef cattle feedlots - (Abstract Only)
Todd, R.W., Waldrip, H., Parker, D.B., Cole, N.A. 2016. Reactive N emissions from beef cattle feedlots. American Society of Animal Science Annual Meeting 1(2016):44.
Estimating emissions from beef and dairy production systems ()
Waldrip, H. 2016. Estimating emissions from beef and dairy production systems. ENVR 3092/6092 Fundamentals of Air Quality. Meeting Abstract. CDROM.
Phosphorus concentrations in sequentially fractionated soil samples as affected by digestion methods - (Peer Reviewed Journal)
Do Nascimento, C.A.C., Pagliari, P.H., Schmitt, D., He, Z., Waldrip, H. 2015. Phosphorus concentrations in sequentially fractionated soil samples as affected by digestion methods. Scientific Reports. 5:17967(13 pages). DOI:10.1038/srep17967.
Legacy phosphorus in calcareous soils: effects of long-term poultry litter application - (Peer Reviewed Journal)
Waldrip, H., Pagliari, P.H., He, Z., Harmel, R.D., Cole, N.A., Zhang, M. 2015. Legacy phosphorus in calcareous soils: effects of long-term poultry litter application. Soil Science Society of America Journal. 79(2015):1601-1614.
Predicting greenhouse gas emissions from beef cattle feedyard manure - (Abstract Only)
Waldrip, H., Casey, K., Todd, R.W., Cole, N.A. 2015. Predicting greenhouse gas emissions from beef cattle feedyard manure [abstract]. In: ASA-CSSA-SSSA Annual Meeting. Emissions from Livestock Production: I. November 16, 2015, Minneapolis, MN. 96-3.
Legacy phosphorus in calcareous soils: Effects of long-term poultry litter application - (Abstract Only)
Waldrip, H., Pagliari, P.H., Harmel, R.D., He, Z., Cole, N.A. 2016. Legacy phosphorus in calcareous soils: Effects of long-term poultry litter application [abstract]. In: ASA-CSSA-SSSA Annual Meeting. Environmental Implications of Using Poultry Litter in Agriculture. November 18, 2015, Minneapolis, MN. 388-1.
Phosphorus concentrations in sequentially fractionated soil samples as affected by digestion methods - (Abstract Only)
Do Nascimento, C., Pagiliari, P.H., Schmidt, D., He, Z., Waldrip, H. 2016. Phosphorus concentrations in sequentially fractionated soil samples as affected by digestion methods [abstract]. In: ASA-CSSA-SSSA Annual Meeting. Nutrient Management & Soil & Plant Analysis Poster Session. November 18, 2015, Minneapolis, MN. 420-11.
Nitrogen sustainability and beef cattle feedyards: II. Ammonia emissions - (Peer Reviewed Journal)
Waldrip, H., Cole, N.A., Todd, R.W. 2015. Nitrogen sustainability and beef cattle feedyards: II. Ammonia emissions. Professional Animal Scientist. 31(5):395-411.
Process-based modeling of ammonia and nitrous oxide emissions from open lot beef and dairy facilities - (Peer Reviewed Journal)
Bonifacio, H.F., Rotz, C.A., Leytem, A.B., Waldrip, H., Todd, R.W. 2015. Process-based modeling of ammonia and nitrous oxide emissions from open lot beef and dairy facilities. Transactions of the ASABE. 58:827-846.
Legacy phosphorus in calcareous soils: effects of long-term poultry litter application on phosphorus distribution in Texas Blackland Vertisol - (Proceedings)
Ammonia and nitrous oxide model for open lot cattle production systems - (Abstract Only)
Bonifacio, H.F., Rotz, C.A., Leytem, A.B., Waldrip, H., Todd, R.W. 2015. Ammonia and nitrous oxide model for open lot cattle production systems{Abstract}. Waste to Worth. p 72819.
Nitrogen sustainability and beef cattle feedyards: introduction and influence of pen surface conditions and diet - (Peer Reviewed Journal)
Waldrip, H., Cole, N.A., Todd, R.W. 2015. Nitrogen sustainability and beef cattle feedyards: introduction and influence of pen surface conditions and diet. The Professional Animal Scientist 2015. 31:89-100 doi:10.15232/pas.2014-01361
Potential traceable markers of organic matter in organic and conventional dairy manure using ultraviolet–visible and solid-state 13C nuclear magnetic resonance spectroscopy - (Peer Reviewed Journal)
He, Z., Zhang, M., Cao, X., Li, Y., Mao, J., Waldrip, H.M. 2015. Potential traceable markers of organic matter in organic and conventional dairy manure using ultraviolet–visible and solid-state 13C nuclear magnetic resonance spectroscopy. Organic Agriculture. 5:113-122.
Organic and inorganic soil phosphorus after long-term poultry litter amendment: effects of litter rate and land-use type - (Abstract Only)
Can surface-applied zeolite reduce ammonia losses from feedyard manure? A laboratory study - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Cole, N.A. 2015. Can surface-applied zeolite reduce ammonia losses from feedyard manure? A laboratory study. Trans.ASABE 58(1):137-145.
Composition of whole and water extractable organic matter of cattle manure affected by management practices ()
He, Z., Waldrip, H. 2015. Composition of whole and water extractable organic matter of cattle manure affected by management practices. Soil Science Society of America Special Publication, Madison, WI. Book Chapter. 382(2015):41-60. doi:10.2136/sssaspecpub62.2014.0034.
Towards sustainability: nitrogen emissions from beef feedyards ()
Predicting greenhouse gas emissions from beef cattle feedyard manure - (Abstract Only)
Waldrip, H., Casey, K.D., Todd, R.W., Cole, N.A. 2014. Predicting greenhouse gas emissions from beef cattle feedyard manure. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No.100-15.
Can surface-applied zeolite reduce ammonia losses from feedyard manure? A laboratory study - (Abstract Only)
Waldrip, H., Todd, R.W., Cole, N.A. 2014. Can surface-applied zeolite reduce ammonia losses from feedyard manure? A laboratory study. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No.260-6.
Greenhouse gas emissions from beef cattle feedlot pen surfaces in Texas - (Abstract Only)
Casey, K.D., Waldrip, H., Todd, R.W., Cole, N.A. 2014. Greenhouse gas emissions from beef cattle feedlot pen surfaces in Texas. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No.96-1.
Biochar effects on phosphorus pools in three soils from Minnesota - (Proceedings)
Pagliari, P., Waldrip, H., Strock, J., Roiger, A. 2014. Biochar effects on phosphorus pools in three soils from Minnesota. ASA-CSSA-SSSA Proceedings. 99-12.
Nutrient management and environmental and societal issues affecting sustainability of feedlot finishing systems - (Abstract Only)
Cole, N.A., Todd, R.W., Waldrip, H., Hales Paxton, K.E. 2014. Nutrient management and environmental and societal issues affecting sustainability of feedlot finishing systems. Journal of Animal Science. 91-E-SUPPL. 2/J.
Mitigating greenhouse gas emissions from beef cattle housing - (Abstract Only)
Cole, N.A., Todd, R.W., Waldrip, H., Shreck, A., Hales Paxton, K.E. 2014. Mitigating greenhouse gas emissions from beef cattle housing. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No.93-2.
Process-based modeling of ammonia emission from beef cattle feedyards with the integrated farm systems model - (Peer Reviewed Journal)
Waldrip, H., Rotz, C.A., Hafner, S.D., Todd, R.W., Cole, N.A. 2014. Process-based modeling of ammonia emission from beef cattle feedyards with the integrated farm systems model. Journal of Environmental Quality. 43:1159-1168.
Methane emissions from a beef cattle feedyard during winter and summer on the southern High Plains of Texas - (Peer Reviewed Journal)
Todd, R.W., Cole, N.A., Waldrip, H. 2014. Methane emissions from a beef cattle feedyard during winter and summer on the southern High Plains of Texas. Journal of Environmental Quality. 43:1125-1130.
Methane emissions from a beef cattle feedyard: measurements and models ()
Soil amino compound and carbohydrate contents influenced by organic amendments ()
He, Z., Olk, D.C., Waldrip, H.M. 2014. Soil amino compound and carbohydrate contents influenced by organic amendments. In: He, Z., Zhang, H., editors. Applied Manure and Nutrient Chemistry for Sustainable Agriculture and Environment. Amsterdam, the Netherlands: Springer. p. 69-82.
Greenhouse gas emissions from cattle systems: factors affecting emissions and mitigation strategies - (Abstract Only)
Cole, N.A., Todd, R.W., Waldrip, H., Hales Paxton, K.E. 2014. Greenhouse gas emissions from cattle systems: factors affecting emissions and mitigation strategies. Alberta Institute of Agrologists Annual Conference, April 1-3,2014, Banff, Canada. 1;6636.
Feed management for beef feedlots to reduce air emissions ()
Characterization of organic matter in beef feedyard manure by Ultraviolet-Visible and Fourier transform infrared spectroscopies - (Peer Reviewed Journal)
Waldrip, H., He, Z., Todd, R.W., Hunt, J.F., Rhoades, M.B., Cole, N.A. 2014. Characterization of organic matter in beef feedyard manure by Ultraviolet-Visible and Fourier transform infrared spectroscopies. Journal of Environmental Quality. 43:690-700.
Characterization of organic matter in beef feedyard manure by ultraviolet-visible and Fourier transform infrared spectroscopies - (Abstract Only)
Waldrip, H., He, Z., Todd, R.W., Hunt, J.F., Rhoades, M.B., Cole, N.A. 2014. Characterization of organic matter in beef feedyard manure by ultraviolet-visible and Fourier transform infrared spectroscopies. ASA-CSSA-SSSA Annual Meeting Abstracts. poster number 1105.
Effects of long-term poultry litter application on inorganic and enzyme hydrolyzable P of Texas Blackland Vertisol - (Abstract Only)
Pagliari, P., Waldrip, H., He, Z., Harmel, R.D., Zhang, M. 2013. Effects of long-term poultry litter application on inorganic and enzyme hydrolyzable P of Texas Blackland Vertisol. ASA-CSSA-SSSA Annual Meeting Abstracts. poster number 1016.
Impact of management practices on water extractable organic carbon and nitrogen from a poultry litter-amended soil - (Abstract Only)
Zhang, M., He, Z., Waldrip, H., Pagliari, P., Harmel, R.D. 2013. Impact of management practices on water extractable organic carbon and nitrogen from a poultry litter-amended soil. ASA-CSSA-SSSA Annual Meeting Abstracts. poster number 2733.
Phoshatase activities and their effects on phosphorus availability in soils amended with livestock manures ()
Waldrip, H., Acosta Martinez, V. 2014. Phoshatase activities and their effects on phosphorus availability in soils amended with livestock manures. In: He, Z., Zhang, H., editors. Applied Manure and Nutrient Chemistry for Sustainable Agriculture and Environment. New York, NY: Springer Science+Media Dordrecht. p. 123-140.
Soil Enzyme Activities as Affected by Manure Types, Application Rates and Management Practices ()
Acosta Martinez, V., Waldrip, H. 2014. Soil enzyme activities as affected by manure types, application rates and management practices. In: He, Z. and Zhang, H., editors. Applied Manure and Nutrient Chemistry for Sustainable Agriculture and Environment. New York, NY: Springer Science+Business Media Dordrecht. p. 99-122.
Greenhouse gas emissions from beef cattle feedlot pen surfaces in Texas during fall - (Abstract Only)
Casey, K.D., Vaddella, V., Waldrip, H., Todd, R.W., Faulkner, W.B. 2013. Greenhouse gas emissions from beef cattle feedlot pen surfaces in Texas during fall. Biological Engineering (ASABE). 1:1620819.
Prediction of nitrogen excretion by beef cattle: a meta-analysis - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Cole, N.A. 2013. Prediction of nitrogen excretion by beef cattle: a meta-analysis. Journal of Animal Science. 91:4290-4302.
Estimation of ammonia emissions from beef cattle feedyards using process-based model manure-dndc - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Cole, N.A., Li, C., Salas, W. 2013. Estimation of ammonia emissions from beef cattle feedyards using process-based model manure-dndc. Transactions of the ASABE. 56(3):1103-1114.
Process models vs empirical models - (Proceedings)
Waldrip, H. 2013. Process models vs empirical models. Western Dairy Air Quality Symposium. 1:1.
Ammonia emissions from open lot dairies: lessons learned from beef cattle feedyards - (Proceedings)
Todd, R.W., Cole, N.A., Auvermann, B.W., Waldrip, H. 2013. Ammonia emissions from open lot dairies: lessons learned from beef cattle feedyards. Western Dairy Air Quality Symposium. 1:1.
Estimation of ammonia emissions from two commercial beef cattle feedyards in the southern high plains with process-based models - (Proceedings)
Waldrip, H., Rotz, C.A., Li, C., Todd, R.W., Salas, W.G., Cole, N.A. 2013. Estimation of ammonia emissions from two commercial beef cattle feedyards in the southern high plains with process-based models. Proceedings of the National Conference on Livestock and Poultry Environmental quality; from Waste to Worth:spreading science and solutions. 1:85.
Nutrient management and environmental and societal issues affecting sustainability of feedlot finishing systems - (Abstract Only)
Cole, N.A., Todd, R.W., Waldrip, H., Hales Paxton, K.E., Macdonald, J.C. 2013. Nutrient management and environmental and societal issues affecting sustainability of feedlot finishing systems. American Society of Animal Science meeting, Indianapolis, Indiana, July 9-13, 2013. Journal of Animal Science, 91:E-Supplement 2.
Ammonia emissions and emission factors: a summary of investigations at beef cattle feedyards on the southern high plains - (Proceedings)
Todd, R.W., Cole, N.A., Waldrip, H. 2013. Ammonia emissions and emission factors: a summary of investigations at beef cattle feedyards on the southern high plains. 2013 Livestock and Poultry Environmental Learning Center Conference Waste to Worth. 1:86.
Arrhenius equation for modeling feedyard ammonia emissions using temperature and diet crude protein - (Peer Reviewed Journal)
Todd, R.W., Cole, N.A., Aiken, R.M., Waldrip, H. 2013. Arrhenius equation for modeling feedyard ammonia emissions using temperature and diet crude protein. Journal of Environmental Quality. 42(3):666-671. doi:10.2134/jeq2012.0371.
Estimation of ammonia emissions from two commercial beef cattle feedyards in the southern high plains with process-based modeling. - (Abstract Only)
Waldrip, H., Rotz, C.A., Li, C., Todd, R.W., Salas, W.G., Cole, N.A. 2013. Estimation of ammonia emissions from two commercial beef cattle feedyards in the southern high plains with process-based modeling.2013 Livestock and Poultry Environmental Learning Center Conference, Waste to Worth. 1:91.
Analysis of carbon functional groups in mobile humic acid and recalcitrant calcium humate extracted from eight US soils - (Peer Reviewed Journal)
He, Z., Cao, X., Mao, J., Ohno, T., Waldrip, H.M. 2013. Analysis of carbon functional groups in mobile humic acid and recalcitrant calcium humate extracted from eight US soils. Pedosphere. 23(6):705-716.
Effects of organic dairy manure on soil phosphatase activity, available soil phosphorus, and growth of sorghum-sudangrass Reprint Icon - (Peer Reviewed Journal)
Waldrip, H., He, Z., Griffin, T.S. 2012. Effects of organic dairy manure on soil phosphatase activity, available soil phosphorus, and growth of sorghum-sudangrass. Soil Science. 177(11):629-637.
Effects of organic dairy manure amendment on soil phosphatase activities - (Abstract Only)
Waldrip, H., Griffin, T.S., He, Z. 2012. Effects of organic dairy manure amendment on soil phosphatase activities. ASA-CSSA-SSSA Annual Meeting Abstracts. 1:1.
Estimation of ammmonia emissions from beef cattle feedyards in the Southern Plains with process-based modeling - (Abstract Only)
Waldrip, H., Todd, R.W., Cole, N.A., Li, C., Salas, W.H., Rotz, C.A. 2012. Estimation of ammmonia emissions from beef cattle feedyards in the Southern Plains with process-based modeling. ASA-CSSA-SSSA Annual Meeting Abstracts. 1:1.
Characterization of ammonium sorption by beef feedyard manure - (Peer Reviewed Journal)
Waldrip, H., Todd, R.W., Cole, N.A. 2012. Characterization of ammonium sorption by beef feedyard manure. Transactions of the ASABE. 55(4):1609-1619.
Estimation of ammonia emissions from beef cattle feedyards in the southern high plains with process-based modeling - (Abstract Only)
Capillary electrophoresis application in metal speciation and complexation characterization ()
Wang, Y., He, Z., Waldrip, H.M. 2012. Capillary electrophoresis application in metal speciation and complexation characterization. In: He, Z., editor. Capillary Electrophoresis: Fundamentals, Techniques and Applications. New York, NY:Nova Science. p. 117-130.
Application of capillary electrophoresis in agricultural and soil chemistry research ()
He, Z., Waldrip, H.M., Yun, W. 2012. Application of capillary electrophoresis in agricultural and soil chemistry research. In: He, Z., editor. Capillary Electrophoresis: Fundamentals, Techniques and Applications. New York, NY:Nova Science. p. 131-151.
Impacts of humic product application on yields of potato and other field crops - (Abstract Only)
Olk, D.C., Mosa, A.M., Waldrip, H. 2011. Impacts of humic product application on yields of potato and other field crops. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 16-19, 2011, San Antonio, TX. CD-ROM.
Effect of Poultry Manure Amendment on Soil Phosphatase Activity - (Abstract Only)
Waldrip, H., He, Z., Erich, M., Honeycutt, C.W. 2008. Effect of Poultry Manure Amendment on Soil Phosphatase Activity. Soil Science Society of America Annual Meeting. October 2008. CD-ROM.
Enzymatic Quantification of Phytate in Animal Manure - (Peer Reviewed Journal)
He, Z., Waldrip, H., Erich, M., Honeycutt, C.W., Senwo, Z.N. 2009. Enzymatic Quantification of Phytate in Animal Manure. Communications in Soil Science and Plant Analysis. 40:566-575.
Soil Phosphorus Dynamics in Response to Poultry Manure Amendment - (Abstract Only)
Waldrip Dail, H.M., He, Z., Erich, M., Honeycutt, C.W. 2007. Soil Phosphorus Dynamics in Response to Poultry Manure Amendment. Soil Science Society of America Annual Meeting. CD-ROM
Enzymatic Quantification of Phytate in Poultry Manure - (Abstract Only)
He, Z., Waldrip Dail, H.M., Erich, M., Honeycutt, C.W., Senwo, Z.N. 2007. Enzymatic Quantification of Phytate in Poultry Manure. International Symposium on Soil and Plant Analysis. Page 54
EFFECTS OF DRYING ON PHOSPHORUS DISTRIBUTION IN POULTRY MANURE - (Peer Reviewed Journal)
Waldrip Dail, H.M., He, Z., Erich, M.S., Honeycutt, C.W. 2007. Effects of drying on phosphorus distribution in poultry manure. Communications in Soil Science and Plant Analysis. 38:1879-1895