Conferences
Nave, RLG; R. M. Sulc, D. J. Barker, "Forage nutritive value changes in a stratified canopy of a mixed cool-season grass sward affected by season." XXII International Grassland Congress 2013.
Barker, D.J. Sparks, P.M., "Running Buffalo clover - Lost, Forgotten, or Overlooked?" Am. Forage and Grassl. Council 2013.
D.J. Barker, R.M. Sulc, R. La Guardia Nave, and F.P. Ferraro, "Use of pasture mass as a predictor of herbage accumulation rate, and some implications for pasture management" Proceedings of the American Forage and Grassland Council [CD-ROM Computer File #2]. AFGC, Elmhurst, IL. 2011.
M.B. Dodd, J.R. Crush, A.D. Mackay, D. Barker, "The ‘root’ to more soil carbon under pastures" New Zealand Grassland Association 2011.
D.J. Barker, "The long and short of Grazing: pre-graze and post-graze targets." 9th Heart of America Grazing Conference 2010.
Ferraro, F.P., R.M. Sulc, D.J. Barker, R. La Guardia Nave, F. Lopes, and K.A. Albrecht., "Seasonal effects on rising plate meter calibration for forage" Proceeding of the American Forage and Grassland Council [CD-ROM Computer File #35]. AFGC, Elmhurst, IL. 2009.
D.J. Barker, F.P. Ferraro, W.S. Klooster, R. La-Guardia-Nave, S. Short, and S.L. Wedryck, "Spatial patterns in grassland at local and landscape scales" Proceedings of the American Forage and Grassland Council. [CD-ROM Computer File #78]. AFGC, Elmhurst, IL. 2009.
Hume, D.E.; Barker, D.J., "Growth and Management of Endophytic Grasses in Pastoral Agriculture" 2008.
Fae, G.S., R.M. Sulc, D.J. Barker, R.K. Dick, and M.L. Eastridge, "Changes in soil carbon and soil physical properties in an integrated crop-livestock system" Proceedings of the International Symposium on Integrated Crop-Livestock Systems 2007.
Diedrick, K.A., Sulc, R.M., Barker, D.J., and McCormick, J.S., "Field performance of alfalfa cultivars selected for resistance to lodging and fast recovery after harvest." Proceedings of the American Forage and Grassland Council 2007.
Hensler, A.L., D.J. Barker, R.M. Sulc, S.C. Loerch, and L.B. Owens, "Comparison of management intensive and continuous grazing in beef cattle pasture" Proceedings of the American Forage and Grassland Council 2007.
Brown, C.L.; D.J. Barker, B.K. Slater, "Spatial variation of endophyte distribution in beef and dairy cattle pasture" Proceedings of the American Forage and Grassland Council 2007.
Hume D.E. and Barker D.J., "Growth and Management of Endophytic Grasses in Pastoral Agriculture" Proceedings of the Fifth International Symposium on Neotyphodium/Grass Interactions 2005.
Barker, D.J., R.M. Sulc, M.R. Burgess, T.L. Bultemeier, "Species richness affects grassland yield and yield stability across seasons, sites and years" Pastoral Systems in Marginal Environments. Proceedings of a Satellite Workshop of the XXth International Grassland Congress 2005.
Barker, D.J., R. Little, D. Samples, C.D. Penrose, R.M. Sulc, J.S. McCormick, T.L. Bultemeier, M.R. Burgess., "Comparative lamb and heifer growth rates on non-toxic and endophyte-free tall fescue" Proceedings of the American Forage and Grassland Council 2005.
McCormick, J.S., R.M. Sulc, D.J. Barker, J.E. Beuerlein and L.H Rhodes, "Forage yield and quality of winter-hardy cereals and winter-sensitive species for grazing" Proceedings of the American Forage and Grassland Council 2004.
Burgess, M.R., D.J. Barker, D.A. Mangione, R.M. Sulc, S.K. Harrison and D.L. Zartman., "Financial analysis of three pasture types for meat goat production from grazing." Proceedings of the American Forage and Grassland Council 2004.
Lambert, M.G.; A.D. Mackay, B.P. Devantier, D.B. McDougall, Barker, D.J., and Z. Park Ng, "Redefining the production potential of hill pastures using fertiliser nitrogen." Proceedings of the New Zealand Grassland Association 2003.
Barker, D.J.; R.M. Sulc, A. Deak, M.H. Hall, M.A. Sanderson, and T.L. Bultemeier, "Performance of pastures with high and low species richness in northeast USA." Proceedings of the American Forage and Grassland Council 2003.
Burgess, M.R.; D.J. Barker, D.L. Zartman, R.M. Sulc, and S.K. Harrison, "Forage species and spatial effects on the dietary intake of goats" Proceedings of the American Forage and Grassland Council 2003.
Bultemeier, T.L.; D.J. Barker, R.M. Sulc, S.K. Harrison, and E.E. Regnier., "Quackgrass contribution to production of pasture mixtures under grazing" Proceedings of the American Forage and Grassland Council 2003.
Dodd, M.B.; D.J. Barker; M.E. Wedderburn, "Practical benefits of pasture diversity in hill country" Proceedings of the New Zealand Grassland Association 2003.
Barker,D,J; Moore,K,J; Guretzky,J,A, "Spatial variation in species richness under contrasting topographies and grazing regimes" American Forage and Grassland Council Conference 2002.
Barker,D,J; Moore,K,J; Guretzky,J,A, "Spatial variation in species richness under contrasting topographies and grazing regimes" American-Forage-and-Grassland-Council Conference 2002.
Barker, D.J.; Moore, K.J.; Guretzky, J.A., "Spatial variation in species richness under contrasting topographies and grazing regimes" 2002.
Barker, D.J.; Moore, K.J.; Guretzky, J.A., "Spatial variation in species richness under contrasting topographies and grazing regimes" 2002.
Barker, D.J.; Moore, K.J.; Guretzky, J.A., "Spatial variation in species richness under contrasting topographies and grazing regimes" American-Forage-and-Grassland-Council Conference 2002.
Barker, D.J.; Moore, K.J.; Guretzky, J.A., "Spatial variation in species richness under contrasting topographies and grazing regimes" American-Forage-and-Grassland-Council Conference 2002.
Barker, D.J.; Caradus, J.R., "Adaptation of forage species to drought" 2001.
Moore, K.J.; Barker, D.J., "Determining pasture biodiversity with NIRS." XIX International Grassland Congress 2001.
Barker, D.J.; Caradus, J.R., "Adaptation of forage species to drought" 19th International Grassland Congress 2001.
Moore, K.J.; Barker, D.J., "Determining pasture biodiversity with NIRS" 2001.
Moore, K.J.; Barker, D.J., "Determining pasture biodiversity with NIRS" 19th International Grassland Congress 2001.
Barker, D.J.; and Caradus, J.R., "Adaptation of forage species to drought" Proceedings of the XIX International Grassland Congress 2001.
Dodd, M.B., Barker, D.J.; Dymock, N.; and Orr, S.J., "Factors influencing the contribution of narrow-leaved plantain to North Island hill country pastures" Proceedings of the New Zealand Grassland Association 2000.
Barker, D.J.; Sheppard, D.G.; Mackay, A.D.; Dymock, N., "Hill Country Farm Investment Options – cocksfoot pasture vs. superphosphate" Proceedings of the New Zealand Grassland Association 1999.
Mackay, A.D.; Lambert, M.G.; Barker, D.J., "Effect of intensification of livestock farming on the physical properties of a hill soil" Proceedings of the 1999 Fertiliser and Lime Research Center Conference 1999.
Kemp, P.D.; Barker, D.J.; Valentine, I.; Awan, M.H.; Nie, Z.N., "Oversowing legumes into perennial pasture: can we do it better?" Proceedings of the 9th Australian Agronomy Conference 1998.
Nicholas, P.K.; Kemp, P.D.; Barker, D.J., "Biodiversity, stability and pasture management - the role of functional groups" Proceedings of the 9th Australian Agronomy Conference 1998.
Barker, D.J.; Clark, D. A.; Thom, E.; Couchman, J.; Burton, R.; Dymock, N., "Pasture species and drought impacts on milk yield 2) Predicted farm milk yield at four sites." Proceedings of the New Zealand Grassland Association 1998.
Barker, D.J.; Christensen, M.J.; Wever, A.C., "Application of endophyte allozyme analysis to Lolium perenne population ecology in hill country pasture" Third International Symposium on Neotyphodium/Grass Interactions 1997.
Barker, D.J.; Hume, D.E.; Quigley, P.E., "Negligible physiological responses to water deficit in endophyte-infected and uninfected perennial ryegrass." Third International Symposium on Neotyphodium/Grass Interactions 1997.
Assuero, S.; Mazzanti, A.; Barker, D.J.; Matthew, C, "Reducing and fructosyl sugar contents of two contrasting tall fescue cultivars in response to water stress" Proceedings of the Agronomy Society of New Zealand 1997.
Barker, D.J.; Christensen, M.J.; Wever, C., "Application of endophyte allozyme analysis to Lolium perenne population ecology in hill country pasture" 3rd International Symposium on Acremonium/Grass Interactions 1997.
Lane, G.A.; Tapper, B.A.; Davies, E.; Hume, D.E.; Latch, G.C.M.; Barker, D.J.; Easton, H.S.; Rolston, M.P., "Effect of growth conditions on alkaloid concentrations in perennial ryegrass naturally infected with endophyte" Third International Symposium on Neotyphodium/Grass Interactions 1997.
Lane, G.A.; Tapper, B.A.; Davies, E.; Hume, D.E. et al., "Effect of growth conditions on alkaloid concentrations in perennial ryegrass naturally infected with endophyte" 3rd International Symposium on Acremonium/Grass Interactions 1997.
Barker, D.J.; Hume, D.E.; Quigley, P.E., "Negligible physiological responses to water deficit in endophyte-infected and uninfected perennial ryegrass" 3rd International Symposium on Acremonium/Grass Interactions 1997.
Assuero,S,G; Mazzanti,A; Barker,D; Matthew,C; KEMP,P, "Non-response of reducing and fructosyl sugar concentrations in tall fescue during water deficit" 27th Annual Conference of the Agronomy Society of New Zealand/NZIAS/NZSHS 1997.
Barker, D.J.; Dymock, N., "The interaction between root distribution and pasture production during water deficit" Proceedings of the XVIII International Grassland Congress 1997.
Nicholas, P.K.; Kemp, P.D.; Barker, D.J.; Brock, J.L.; Grant, D.A., "Production, stability and biodiversity of North Island New Zealand hill pastures" Proceedings of the XVIII International Grassland Congress 1997.
Awan, M.H.; Kemp, P.D.; Barker, D.J.; Choudhary, M.A., "Development and fate of three temperate legumes following oversowing." Proceedings of the XVIII International Grassland Congress. 1997.
Barker, D.J.; Christensen, M.J.; Wever, C., "Application of endophyte allozyme analysis to Lolium perenne population ecology in hill country pasture" 1997.
Lane, G.A.; Tapper, B.A.; Davies, E.; Hume, D.E. et al., "Effect of growth conditions on alkaloid concentrations in perennial ryegrass naturally infected with endophyte" 1997.
Nie, Z.N.; Valentine, I.; Barker, D.J.; Mackay, A.D.; Hodgson, J., "Impact of a pastoral fallow on the morphology and growth of white clover (Trifolium repens L.) in a New Zealand hill pasture" Proceedings of the XVIII International Grassland Congress 1997.
Barker, D.J.; Hume, D.E.; Quigley, P.E., "Negligible physiological responses to water deficit in endophyte-infected and uninfected perennial ryegrass" 1997.
Lambert, M.G.; Barker, D.J.; Mackay, A.D.; Springett, J.A., "Biophysical indicators of sustainability of North Island hill pasture systems" Proceedings of the New Zealand Grassland Association 1996.
Faulalo, K.; Hedley, M.J.; del Pino Machado, A.S.; Mackay, A.D.; Barker D.J., "The development of a pasture growth model based on predicted evapotranspiration and soil fertility status." Proceedings of the Australian Soil Science Society 1996.
Hyslop, M.G.; Kemp, P.D.; Barker, D.J.; Hodgson, J., "The incidence of nodal rooting and plantlet survival in spreading red clover (Trifolium pratense L.)" Proceedings of the New Zealand Grassland Association 1996.
Nie, Z.N.; Valentine, I.; Mackay, A.D.; Barker, D.J.; Hodgson, J., "Long-term effects of pastoral fallowing on white clover (Trifolium repens L.) and grass growth in a hill pasture" Proceedings of the Joint Symposium - White clover: New Zealand’s competitive edge 1995.
AWAN, M.H.; BARKER, D.J.; KEMP, P.D.; CHOUDHARY, M.A., "Effect of sowing rate on herbage yield of four legume species oversown in hill country" 1994.
Awan, M.H.; Barker, D.J.; Kemp, P.D.; Choudary, M.A., "Effect of sowing rate on herbage yield of four legume species oversown in hill country" Annual Conference of the Agronomy Society of New Zealand 1994.
AWAN, M.H.; BARKER, D.J.; KEMP, P.D.; CHOUDHARY, M.A., "Effect of sowing rate on herbage yield of four legume species oversown in hill country" 24th Annual Conference of the Agronomy-Society-of-New-Zealand 1994.
Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J., "Physiological and morphological responses of lucerne to soil moisture stress" Proceedings of the International Symposium on Grassland Resources 1994.
Awan, M.H.; Kemp, P.D.; Choudhary, M.A.; Barker, D.J., "Pasture legume establishment from oversowing in drought-prone hill country" Proceedings of the New Zealand Grassland Association 1993.
Barker, D.J.; Caradus, J.R.; McManus, M.T., "Physiological responses of white clover genotypes to water deficit." Proceedings of the XVII International Grassland Congress 1993.
Hume, D.E.; Popay, A.J.; Barker, D.J., "Effect of Acremonium endophyte on growth of ryegrass and tall fescue under varying levels of soil moisture and Argentine stem weevil attack." Proceedings of the Second International Symposium on Acremonium/Grass Interactions 1993.
Barker, D.J.; Baars, J.A., "Comparing the seasonal productivity of cocksfoot and resident pastures on hill country farms using a system-model" Proceedings of the New Zealand Grassland Association 1993.
Maclean, B.; Matthew, C.; Latch, G.C.M.; Barker, D.J., "The effect of endophyte on drought resistance in tall fescue." Proceedings of the Second International Symposium on Acremonium/Grass Interactions 1993.
Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J., "Adaptation of sainfoin cultivars and lucerne to water stress" Proceedings of the XVII International Grassland Congress 1993.
Barker, D.J.; Davies, E.; Lane, G.A.; Latch, G.C.M.; Nott, H.M.; Tapper, B.A., "Effect of water deficit on alkaloid concentrations in perennial ryegrass endophyte associations." Proceedings of the Second International Symposium on Acremonium/Grass Interactions 1993.
Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J., "Comparison of sainfoin cultivars and lucerne, with an emphasis on sainfoin responses to water stress." Proceedings of the Agronomy Society of New Zealand 1993.
DEHABADI, S.; KEMP, P.D.; BARKER, D.J.; HODGSON, J., "A COMPARISON OF SAINFOIN CULTIVARS AND LUCERNE, WITH AN EMPHASIS ON SAINFOIN RESPONSES TO WATER STRESS" 1993.
DEHABADI, S.R.M.H.; KEMP, P.D.; BARKER, D.J.; HODGSON, J., "A COMPARISON OF SAINFOIN CULTIVARS AND LUCERNE, WITH AN EMPHASIS ON SAINFOIN RESPONSES TO WATER STRESS" 23rd Annual Conference of the Agronomy-Society-of-New-Zealand 1993.
Hume, D. E; Barker, D. J., "Natural reseeding of five grass species in summer dry hill country" Proceedings of the New Zealand Grassland Association 1991.
Mackay, A. D.; Tillman, R. W.; Parker, W. J.; Barker, D. J., "Effect of superphosphate, lime, and cocksfoot on summer dry hill country pasture production" Proceedings of the New Zealand Grassland Association 1990.
Stevens, D. R.; Turner, J. D.; Barker, D. J.; Moloney, S. C., "‘Grasslands Maru’ phalaris: productive and persistent in hill country" Proceedings of the New Zealand Grassland Association 1989.
Barker, D.J.; Chu, A.C.P.; Korte, C.J., "Ryegrass herbage yield components and their response to water deficit stress" Proceedings of the XVI International Grassland Congress 1989.
Sanders, P. M.; Barker, D. J., "Pasture plant identification using isozyme electrophoresis" Proceedings of the New Zealand Grassland Association 1988.
Barker, D. J.; Chu, A. C. P.; Korte, C. J., "Some effects of spring defoliation and drought on perennial ryegrass swards" Proceedings of the New Zealand Grassland Association 1985.
Barker, D. J.; Lancashire, J. A.; Meurk, C., "‘Grasslands Wana’ cocksfoot - An improved grass suitable for hill country" Proceedings of the New Zealand Grassland Association 1985.
Barker, D. J.; Chu, A. C. P., "Strategies for dryland pasture management – A review" Proceedings of the Agronomy Society of New Zealand 1985.
Presentations
"HCS Curriculum Revisions." In HCS Departmental Seminar Series. 2016.
"Impressions from Saudi Arabia." In HCS Departmental Seminar Series. 2016.
"Managing your forage mass." In Ohio Forage and Grassland Council. 2014.
"Management Intensive Grazing." In Monthly Meeting OSU Horsemen’s Club. 2010.
"Pasture cover: Measurement of pasture mass and its use as a metric for forage/grazing systems." In Monthly Webinar American Forage and Grassland Council. 2010.
"The long and short of grazing: pre-graze and post-graze targets." In Annual Conference of Michigan Forage and Grassland Council. 2010.
"What do the rising plate meter and your forage inventory have in common?." In Annual Meeting of the Ohio Forage and Grassland Council. 2010.
"Pasture Management." In Quarterly meeting of the Ohio Alpaca Breeders Assoc. 2010.
"Mud, Dirt or Soil? Soil Science 101 - An Introduction to Soil and Its Effects on Native Plants." In Monthly Meeting of the "Wild Ones". 2010.
"Rotational grazing management – when to hold & when to fold." In Annual Meeting of the Ohio Forage and Grassland Council. 2009.
"Nitrogen: Clover vs Fertilizer, responses and economics." In North Central Ohio Dairy Grazing Conference. 2009.
"Economics of endophyte control in beef systems." In University of Illinois, Dudley Smith Field Day. 2008.
"Update on OSU research." In North Central Ohio Dairy Grazing Conference. 2008.
"New options in forage management." In Annual Seed Seminar Central Farm and Garden, Inc.. 2008.
"Pasture Fertility – Implications of Grazing." In Annual Meeting of the Ohio Forage and Grassland Council. 2007.
"Forage Grazing Research in Ohio - Update." In Ohio Forage and Grassland Council Annual Meeting. 2006.
"Species richness affects grassland yield and yield stability across seasons, sites and years." In XX International Grassland Congress. 2005.
"The endophyte problem & The non-toxic solution." In Ohio Forage and Grassland Council Annual Meeting. 2005.
"OSU Research Update." In Ohio Forage and Grassland Council Annual Meeting. 2004.
"Seeding Method Comparisons to Improve Kura Clover Establishment." In Grazinglands Conservation Initiative (GLCI) National Conference. 2003.
"Plenary presentation - Drought Adaption in Forage Species." In International Grassland Congress. 2001.
"A pasture competition model in which Hopf bifurcations are induced by a delay." In Australian and NZ Industrial Applied Mathematics Conference. 2000.
"Anthropogenic Impacts on Some Indigenous Species in North Island, New Zealand, Hill Country Pasture." In Nature Conservation in Production Environments: Managing the Matrix. 1997.
"Indicators of Farm Resource Status." In Proceedings of the Soil and Land Indicators Workshop. 1995.
"Recent and current results from Bromus spp., Maru, and Wana in hill country." In AgResearch Science and Technology Transfer Workshop. 1992.
Technical Reports
J.S. McCormick, R.M. Sulc, D. J. Barker, "2016 Ohio Forage Performance Trials" 2016.
McCormick, J.S., Sulc, R.M., and Barker, D.J., "Ohio Forage Performance Trials 2014" 2014.
McCormick, J.S., Sulc, R.M., and Barker, D.J., "Ohio Forage Performance Trials 2013" 2013.
McCormick, J.S., Sulc, R.M., and Barker, D.J., "Ohio Forage Performance Trials 2012" 2012.
Barker, D.J., Sulc, R.M. and McCormick, J.S., "Field Guide for Lambsear Establishment" 2012.
Barker, D.J., Sulc, R.M., and McCormick, J.S., "Field Guide for Lambsear Management" 2012.
Sulc, R.M., McCormick, J.S., and Barker, D.J., "Ohio Forage Performance Trials 2011" 2011.
Sulc, R.M., McCormick, J.S., and Barker, D.J., "Ohio Forage Performance Trials 2010" 2010.
Sulc, R.M., McCormick, J.S., Barker, D.J. and K.A. Diedrick., "Ohio Forage Performance Trials 2009" 2009.
Sulc, R.M., McCormick, J.S., Barker, D.J. and Diedrick, K.A., "Ohio Forage Performance Trials 2008" 2008.
Sulc, R.M., McCormick, J.S., Barker, D.J. and Diedrick, K.A., "Ohio Forage Performance Trials 2007" 2007.
McCormick, J.S., Sulc, R.M., Rhodes, L.H., Barker, D.J. and Diedrick, K.A., "Ohio Forage Performance Trials 2006" 2006.
Barker, D.J., and Sulc, R.M., "Pasture and grazing management. Chapter 9 In Ohio Agronomy Guide, 14th ed. Bull. 472" 2005.
Sulc, R.M., and D.J. Barker, "Forage production. Chapter 7 in Ohio Agronomy Guide. 14th ed, Bulletin 472" 2005.
Sulc, R.M., McCormick, J.S., Rhodes, L.H., and Barker, D.J., "Ohio Forage Performance Trials 2005" 2005.
Sulc, R.M., McCormick, J.S., Rhodes, L.H., and Barker, D.J., "Ohio Forage Performance Trials 2004" 2004.
McCormick, J.S., Sulc, R.M., Rhodes, L.H., and Barker, D.J. Hammond, R.B., "Ohio Forage Performance Trials 2003" 2003.
McCormick, J.S., Sulc, R.M., Rhodes, L.H., and Barker, D.J. Hammond, R.B., "Ohio Forage Performance Trials 2002" 2002.
McCormick, J.S., Sulc, R.M., Rhodes, L.H., and Barker, D.J. Hammond, R.B., "Ohio Forage Performance Trials 2001" 2001.
Sulc, R.M., McCormick, J.S., Rhodes, L.H., Willson, H., Barker, D.J., Grimes, J., Hammond, R.B., "Ohio Forage Performance Trials 2000" 2000.
