David Barker
Associate Professor
Department of Horticulture and Crop Science

226 Kottman Hall 2021 Coffey Road Columbus, OH 43210 Phone: 614-247-6258 Fax: 614-292-7162

Email: barker.169@osu.edu

at OSU since 2000

ASSIGNMENT: 60% Research; 0% Extension; 40% Teaching

EDUCATION:

"My research has focused on the ecology of grasslands, under stressed conditions such as low fertility, drought and frequent grazing. Specific projects have included community-scale studies such as species composition and the balance between species in pastures subjected to stress. More detail studies have investigated the genetic structure of key species (white clover and ryegrass) within the population. Applied projects have evaluated new species and varieties under grazing, and this has developed over recent years to consideration of biodiversity effects in pastures, especially those effects related to species richness. Two studies have measured the effects of endophyte on grassland ecology."
Research projects:

• The Interaction Between Biodiversity and Water Deficit on Forage Biomass Characteristics


• Application of Biodiversity Theory to Species Mixtures for Grazing


• Population Stability in Endophyte-free Novel-endophyte Tall Fescue Pastures


• The Measurement of Intra-species Diversity and its Influence on Forage Biomass Characteristics


• Pasture Species Mixtures For Sustainable Forage Production Under Grazing


• Survey of endophyte in perennial ryegrass in Ohio

Courses taught:

SELECTED SCHOLARLY CONTRIBUTIONS DURING LAST FIVE YEARS Refereed journal papers, books, and book chapters (career total= 37 )

• P.R. Thomison, D.J. Barker, A. B. Geyer, L. D. Lotz, H. J. Siegrist, and T. L. Dobbels (2003) Amino acid composition of TopCross high-oil maize grainn. Plant Genetic Resources: Characterization and Utilization 1:89-95.


• White, T.A., Barker, D.J. and Moore, K.J. (2004) Vegetation diversity, growth, quality and decomposition in managed grasslands. Agriculture Ecosystems and Environment101:73-84.


• White, T.A., Barker, D.J. and Moore, K.J. (2004) The importance of local scale processes to landscape scale patterns of grassland vegetation diversity. New Zealand journal of agricultural research 47: 199-207.


• M.B. Dodd, D.J. Barker, M.E. Wedderburn. (2004) Plant diversity effects on herbage production and compositional changes in New Zealand hill country pastures . Grass and Forage Sci. 59:29-40.


• M. A. Sanderson, D.J. Barker, G.R. Edwards, B. Tracy, R. H. Skinner, D. Wedin (2004) Plant species diversity and management of temperate forage and grazing land ecosystems. Crop Sci. 44:1132-1144.


• T. L. Bultemeier, D.J. Barker, R. M. Sulc, S. K. Harrison, E.E. Regnier (2005) Species interactions with quackgrass and their effects on forage production. Crop Sci. 45:290-296.


• Barker, D.J.; R. M. Sulc, T. L. Bultemeier, J. McCormick, R. Little, C. D. Penrose, D. Samples (2005) Contrasting toxic-endophyte contamination between endophyte-free and nontoxic-endophyte tall fescue pastures. Crop Sci (accepted)


• M. E. Wedderburn, S. J. Orr, D. F. Chapman, D. J. Barker , N. Dymock (2004) Genetic differentiation in white clover (Trifolium repens) populations during eight years of contrasting phosphorus supply in New Zealand hill country. New Zealand journal of agricultural research (submitted Jan 2004)


• Liu, J; D.J. Barker, R.M. Sulc (2005) Morphological variation within and between four ryegrass cultivars. Crop Sci. (submitted)


• Blevins, D., and D.J. Barker. 2004. Plant nutrient and water interactions. In. Forages: Volume II. The Science of Grassland Agriculture. R.F Barnes, C.J. Nelson, M. Collins and K.J. Moore, Editors. Iowa State Press/Blackwell Publishing Company, Ames, Iowa. 6 th Edition.


• Barker, D.J., and M. Collins. 2003. Forage fertilization and nutrient management. p. 263-293. In. Forages: Volume I. An Introduction to Grassland Agriculture. R.F Barnes, C.J. Nelson, M. Collins and K.J. Moore, Editors. Iowa State Press/Blackwell Publishing Company, Ames, Iowa. 6 th Edition.


• Hume D.E. and Barker D.J. 2005. Growth and Management of Endophytic Grasses in Pastoral Agriculture. p. 199-225. In C.A. Roberts, C.P. West, and D.E. Spiers (eds.) Neotyphodium in cool-season grasses. Blackwell Publishing, Ames, IA. Proceedings of the Fifth International Symposium on Neotyphodium/Grass Interactions, Fayetteville, Arkansas, USA. 23-26 May 2004.

Refereed/Edited Proccedings and Conference publications (career total=54 )

• Barker, D.J.; R.M. Sulc, A. Deak, M.H. Hall, M.A. Sanderson, and T.L. Bultemeier. 2003. Performance of pastures with high and low species richness in northeast USA. American Forage and Grasslands Congress Proceedings 12:172-176.


• Bultemeier, T.L.; D.J. Barker, R.M. Sulc, S.K. Harrison, and E.E. Regnier. 2003. Quackgrass contribution to production of pasture mixtures under grazing. American Forage and Grasslands Congress Proceedings 12:135-139.


• Burgess, M.R.; D.J. Barker, D.L. Zartman, R.M. Sulc, and S.K. Harrison. 2003. Forage species and spatial effects on the dietary intake of goats. American Forage and Grasslands Congress Proceedings 12:182-186.


• Dodd, M.B.; D.J. Barker; M.E. Wedderburn. 2003. Practical benefits of pasture diversity in hill country. Proceedings of the New Zealand Grassland Association 65: 127-132.


• Lambert, M.G.; A.D. Mackay, B.P. Devantier, D.B. McDougall, Barker, D.J., and Z. Park-Ng 2003. Redefining the production potential of hill pastures using fertiliser nitrogen. Proceedings of the New Zealand Grassland Association 65 :35-40.


• Burgess, M.R., D.J. Barker, D.A. Mangione, R.M. Sulc, S.K. Harrison and D.L. Zartman. 2004. Financial analysis of three pasture types for meat goat production from grazing. Proceedings of the American Forage and Grasslands Congress 13: 245-249


• McCormick, J.S., R.M. Sulc, D.J. Barker, J.E. Beuerlein and L.H Rhodes (2004) Forage yield and quality of winter-hardy cereals and winter-sensitive species for grazing. American Forage and Grasslands Congress Proceedings 13: 225-229.


• Barker, D.J. and R.M. Sulc. 2005. Forage crops and rangeland. Chapter 20 in Hartmann's Plant Science: Growth, Development, and Utilization of Cultivated Plants (4th Edition). ed. M. McMahon et al. Publ. Prentice Hall (in press).


• McCormick, J.S., R.M. Sulc, D.J. Barker, and J.E. Beuerlein. 2005. Customizing rising plate meter calibration for annual species and environments.American Forage and Grasslands Congress Proceedings 14: submitted.

Extension, technical, trade, or popular articles (career total=38)

• Samples, D.H., Sulc, R.M, Barker, D.J, Lewandowski, R., Penrose, C.D. 2003. Seeding Method Comparisons to Improve Kura Clover Establishment. Poster at the Grazinglands Conservation Initiative (GLCI) National Conference, Nashville, TN 7-10 December.


• Barker, D.J.; N.S. Hill, and J.G. Andrae (2003) Measuring endophyte in tall fescue - plants, fields and farms. Chapter 6 in the online e-book Tall Fescue Information System


• Bultemeier, T. L. and Barker, D.J. [advisor]. Species Interactions with Quackgrass and Their Effect on Forage Production. M.S., The Ohio State University, 2003.


• Burgess, M.R. and Barker, D.J. [advisor]. Species Richness and Spatial Pattern Effects on Goat Intake. M.S., The Ohio State University, 2003.


• Barker, D.J., Landon Rhodes, Megan Burgess, Rory Lewandowski, Tom Noyes, Dean Slates (2004) Factors Affecting the Occurrence of Endophyte in Perennial Ryegrass and Tall Fescue in Ohio Dairy Pastures. American Forage and Grasslands Congress Proceedings 13:505.


• Barker, D.J ., R. M. Sulc, M. R. Burgess, M. H. Hall, A. Deak, M. A. Sanderson (2004) Effects of Biodiversity on Forage Yield in Wet and Dry Years. [CD-ROM Computer File] Agronomy Abstracts #5780 ASA, Madison, WI.

Web sites, videos and/or other electronic media (career total= 5 )

Cultivars, Varieties and/or Patents (career total= 0 )
none


Invited out-of-state and/or international presentations (career total= 5)

• Barker, D.J .; and Caradus, J.R. 2001: Adaptation of forage species to drought. Plenary paper - Proceedings of the XIX International Grassland Congress, Brazil. Pp 241-246.


• Barker, D.J. 2000 Leu Distinguished Lecture (by invitation), Center for Grassland Studies, University of Nebraska (and 2 associated lectures to students). Biodiversity of New Zealand Grasslands


• Louie, K.; Lambert, M.G.; Mackay, A.D.; Barker, D.J. 2000: A pasture competition model in which Hopf bifurcations are induced by a delay. Paper presented to the Australian and NZ Industrial Applied Mathematics Conference.

1. Develop a research theme and Hatch Project, focusing on forage plant species and their interactions with each other and their environment.


2. Pursue scientific and applied research of relevance to Ohio agriculture, USA, and the world, and especially to promote applications for use of forage species under grazing.


3. Develop undergraduate and graduate teaching and advising to support the above two goals.


4. Develop interactions with the Ohio, USA and international farming and agricultural research community to ensure that my forage research and teaching is both relevant to current problems, and that information I have is extended to others.

AREA OF EXPERTISE:
My primary areas of research and teaching interest are:

a) Production and performance of forages within grazing systems.

b) Biodiversity effects (species and population composition) on forage production and performance.

c) Drought effects on forage production and performance.

Last modified: 5/14/2008