PUBLICATIONS

The effects of summer moisture stress and its interaction with spring cutting managements on the production and persistence of a ryegrass (Lolium perenne L.) sward.
MAgSc. Thesis, Massey University, 1983.

Some Physiological Responses of Sorghum and Six Forage Grasses to Water Deficit Stress.
PhD Dissertation, University of Nebraska-Lincoln, 1990.

Refereed Papers
  1. Barker, D. J.; Chu, A. C. P.; Korte, C. J. 1985: Depletion of soil water from a Tokomaru silt loam by a perennial ryegrass sward. New Zealand journal of agricultural research 28: 525-530.
  2. Barker, D. J.; Chu, A. C. P.; Korte, C. J. 1985: Some effects of spring defoliation and drought on perennial ryegrass swards.Proceedings of the New Zealand Grassland Association 46: 57-63.
  3. Barker, D. J.; Chu, A. C. P. 1985: Strategies for dryland pasture management - A review. Proceedings of the Agronomy Society of New Zealand 15: 115-120.
  4. Barker, D. J.; Lancashire, J. A.; Meurk, C. 1985: ‘Grasslands Wana’ cocksfoot - An improved grass suitable for hill country. Proceedings of the New Zealand Grassland Association 46: 167-172.
  5. Barker, D. J.; Zhang, D. M. 1988: The effects of paraquat spraying, seed placement, and pre-germination on the appearance and survival of white clover, cocksfoot, and ryegrass seedlings from spring oversowing in hill country. New Zealand journal of experimental agriculture 16: 1-9.
  6. Barker, D. J.; Zhang, D. M.; Mackay, A. D. 1988: Root distribution in a low fertility hill country sward grazed by sheep - a short communication. New Zealand journal of experimental agriculture 16: 73-76.
  7. Barker, D. J.; Chapman, D. F.; Anderson, C. B.; Dymock, N. 1988: Oversowing 'Grasslands Wana' cocksfoot, 'Grasslands Maru' phalaris, and 'Grasslands Tahora' white clover in hill country at varying rates of paraquat and glyphosate. New Zealand journal of agricultural research 31: 373-382.
  8. Sanders, P. M.; Barker, D. J. 1988: Applications for electrophoretic identification of enzyme genotypes in pasture plants. Proceedings of the New Zealand Grassland Association 49: 77-80.
  9. Sanders, P. M.; Barker, D. J.; Wewala, G. S. 1989: Phosphoglucoisomerase-2 allozymes for distinguishing perennial ryegrass cultivars in binary mixtures. Journal of agricultural science, Cambridge 112: 179-184.
  10. Stevens, D. R.; Turner, J. D.; Barker, D. J.; Moloney, S. C. 1989: 'Grasslands Maru' phalaris: productive and persistent in hill country. Proceedings of the New Zealand Grassland Association 50: 231-236.
  11. Mackay, A. D.; Tillman, R. W.; Parker, W. J.; Barker, D. J. 1990: Effect of superphosphate, lime, and cocksfoot on summer dry hill country pasture production. Proceedings of the New Zealand Grassland Association 51: 131-134.
  12. Hume, D. E; Barker, D. J. 1991: Natural reseeding of five grass species in dry hill country. Proceedings of the New Zealand Grassland Association 53: 97-104.
  13. Barker, D. J.; Anderson, C. B.; Dymock, N. 1991: 'Grasslands Wana' cocksfoot persistence and autumn/winter production in hill country, under contrasting managements and micro-topographies. New Zealand journal of agricultural research 34: 25-30.
  14. Stevens, D. R.; Lancashire, J. A.; Barker, D. J.; Moloney, S. C.; Archie, W. J.; Pollock, K. M. 1993: Introduction, production and persistence of five grass species in dry hill country 1. Introduction, site descriptions and general methods.New Zealand journal of agricultural research 36: 1-10.
  15. Barker, D. J.; Lambert, M. G.; Dymock, N.; Gray, Y. S. 1993: Introduction, production and persistence of five grass species in dry hill country 5. Central Wairarapa. New Zealand journal of agricultural research 36: 29-39.
  16. Barker, D. J.; Dymock, N. 1993: Introduction, production and persistence of five grass species in dry hill country 6. Ballantrae. New Zealand journal of agricultural research 36: 41-47.
  17. Moloney, S. C.; Lancashire, J. A.; Barker, D. J. 1993: Introduction, production and persistence of five grass species in dry hill country 7. Central Plateau. New Zealand journal of agricultural research 36: 49-59.
  18. Barker, D. J.; Stevens, D. R.; Lancashire, J. A.; Scott, D.; Moloney, S. C.; Turner, J. D.; Dymock, N.; Archie, W. J. 1993: Introduction, production and persistence of five grass species in dry hill country 8. Summary and Conclusions. New Zealand journal of agricultural research 36: 61-66.
  19. Barker, D. J.; Dymock, N. 1993: Effects of pre-sowing herbicide and subsequent sward mass on survival, development, and production of autumn oversown Wana cocksfoot and Tahora white clover seedlings. New Zealand journal of agricultural research 36: 67-77.
  20. Barker, D. J.; Sullivan, C. Y.; Moser, L. E. 1993: Water deficit effects on osmotic potential, cell wall elasticity, and proline in five forage grasses. Agronomy Journal 85: 270-275.
  21. Barker, D.J.; Baars, J.A. 1993: Comparing the seasonal productivity of cocksfoot and resident pastures on hill country farms using a system-model. Proceedings of the New Zealand Grassland Association 55: 81-85.
  22. Awan, M.H.; Kemp, P.D.; Choudary, M.A.; Barker, D.J. 1993: Pasture legume establishment in drought-prone hill country. Proceedings of the New Zealand Grassland Association 55: 101-104.
  23. Awan, M.H.; Barker, D.J.; Kemp, P.D.; Choudary, M.A. 1995: Soil surface moisture measurement and its influence on the establishment of three oversown legume species. Journal of agricultural science, Cambridge 127: 169-174.
  24. Lambert, M.G.; Barker, D.J.; Mackay, A.D.; Springett, J.A. 1996: Biophysical indicators of sustainability of North Island hill pasture systems. Proceedings of the New Zealand Grassland Association 57: 31-36.
  25. Hyslop, M.G.; Kemp, P.D.; Barker, D.J.; Hodgson, J. 1996: The incidence of nodal rooting and plantlet survival in spreading red clover (Trifolium pratense L.) Proceedings of the New Zealand Grassland Association 58: 243-246.
  26. Nie, Z.N.; Mackay, A.D.; Barker, D.J.; Valentine, I.; Hodgson, J. 1997: Changes in plant population density, composition and sward structure of a hill pasture during a pastoral fallow. Grass and Forage Science 52: 190-198.
  27. Nie, Z.N.; Mackay, A.D.; Valentine, I.; Barker, D.J.; Hodgson, J. 1997: Influence of pastoral fallow on plant root growth and soil physical and chemical characteristics in a hill pasture. Plant and Soil 197: 201-208.
  28. Springett, J.A.; Gray, R.A.J.; Barker, D.J.; Lambert, M.G.; Mackay, A.D.; Thomas, V.J. 1998: Population density and distribution of the New Zealand indigenous earthworm Octochaetus multiporous (Megascolecidae: Oligochaeta) in hill pastures. New Zealand Journal of Ecology 22: 87-93.
  29. Nie, Z.N.; Mackay, A.D.; Valentine, I.; Barker, D.J.; Hodgson, J. 1998: Influence of timing and duration of on pastoral fallowing and nitrogen fertiliser on pasture and white clover (Trifolium repens L.) growth in hill country. New Zealand journal of agricultural research 41: 19-30.
  30. Barker, D.J.; Clark, D. A.; Thom, E.; Couchman, J.; Burton, R.; Dymock, N. 1998: Pasture species and drought impacts on milk yield 2) Predicted farm milk yield at four sites. Proceedings of the New Zealand Grassland Association 60: 45-50.
  31. Clark, H.; Newton, P.C.D.; Barker, D.J. 1999: Physiological and morphological responses to elevated CO2 and a soil moisture deficit of temperate pasture species growing in an established plant community. Journal of Experimental Botany 50: 233-242.
  32. Nie, Z.N.; Barker, D.J.; Valentine, I.; Mackay, A.D.; Hodgson, J. 1999: Changes in the population of germinated seed in a hill pasture during and after a pastoral fallow. Grass and Forage Science 54: 127-136.
  33. Betteridge, K.; Mackay, A.D.; Shepherd, T.G.; Barker, D. J.; Budding, P.J.; Devantier, B.P.; Costall, D. A. 1999: Effect of cattle and sheep treading on surface configuration of a sedimentary hill soil. Australian Journal of Soil Research 37: 743-760.
  34. Barker, D.J.; Sheppard, D.G.; Mackay, A.D.; Dymock, N. 1999: Hill Country Farm Investment Options – cocksfoot pasture vs. superphosphate. Proceedings of the New Zealand Grassland Association 61: 17-21.
  35. Dodd, M.B., Barker, D.J.; Dymock, N.; and Orr, S.J. 2000: Factors influencing the contribution of narrow-leaved plantain to North Island hill country pastures. Proceedings of the New Zealand Grassland Association 62: 179-182.

  36. Hopkins, A.; Lambert, M. G.; Barker, D. J.; Costall, D. A.; Sanders, P. M.; Scott A. G.; W. M. Williams. 2000. Determination of management and topographic influences on the balance between resident and Grasslands Huia white clover (Trifolium repens) in an upland pasture using isozyme analysis. Journal of Ag Sci, Camb. 134: 137-145.
  37. McManus, M.T.; Bieleski, R.E.; Caradus, J.R.; Barker, D.J. 2000: Pinitol accumulation in mature leaves of white clover in response to a water deficit. Environmental and Experimental Botany 43: 11-18.
  38. Assuero, S. G.; Matthew, C.; Kemp, P.; Latch, G.C.M.; Barker, D.J.; Haslett, S.J. 2000: Morphological and physiological effects of water deficit and endophyte infection on contrasting tall fescue cultivars. New Zealand journal of agricultural research 43: 49-61
  39. Hazard, L.; Barker, D.J.; Easton, H.S. 2001. Morphogenetic adaptation to defoliation and soil fertility in perennial ryegrass. New Zealand journal of agricultural research 44: 1-12.
  40. Ken Louie, Graeme C. Wake, Greg Lambert, Alec MacKay, David Barker. 2001. A delay model for the growth of ryegrass-clover mixtures: Formulation and preliminary simulations. Submitted to Ecological Modelling May 2001
  41. Woodward, S.J.R.; Barker, D.J., Zyskowski, R.F. 2001: A practical model for predicting soil water deficit in New Zealand. New Zealand journal of agricultural research 44: 91-109.
  42. Assuero, S. G.; Matthew, C.; Kemp, P.; Barker, D.J.; Mazzanti, A.; 2002: Effects of water deficit on Mediterranean and temperate tall fescue. Australian journal of agricultural research 53: accepted for issue 1.
  43. Barker, D. J.; Lambert, M. G.; Springett, J. A.; Mackay, A. D. 2000: Root characteristics of hill pastures following 20 years of contrasting fertiliser inputs and sheep stocking rates. in prep


    44. Non-refereed Papers
  44. Lambert, M. G.; Rhodes, A. P.; Barker, D. J.; Bircham, J. S. 1985: Establishing and managing improved plants in hill country. In “Using and managing improved plants in hill country” R. E. Burgess & J. L. Brock eds. New Zealand Grassland Association p. 31-35.
  45. Barker, D. J.; Chu, A. C. P.; Korte, C. J. 1989: Ryegrass herbage yield components and their response to water deficit stress. Proceedings of the XVI International Grassland Congress, Nice. 503-504.
  46. Barker, D.J.; Caradus, J.R.; McManus, M.T. 1993: Physiological responses of white clover genotypes to water deficit. Proceedings of the XVII International Grassland Congress, Palmerston North. 8-21 February 1993. p. 67-68.
  47. Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J. 1993: Adaptation of sainfoin cultivars and lucerne to water stress. Proceedings of the XVII International Grassland Congress, Palmerston North. 8-21 February 1993. p. 158-159.
  48. Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J. 1993: Comparison of sainfoin cultivars and lucerne, with an emphasis on sainfoin responses to water stress. Proceedings of the Agronomy Society of New Zealand 23: 63-67.
  49. Barker, D.J.; Davies, E.; Lane, G.A.; Latch, G.C.M.; Nott, H.M.; Tapper, B.A. 1993. Effect of water deficit on alkaloid concentrations in perennial ryegrass endophyte associations. Proceedings of the Second International Symposium on Acremonium/Grass Interactions, Palmerston North, New Zealand. 4-6 February 1993. 67-71.
  50. Hume, D.E.; Popay, A.J.; Barker, D.J. 1993. 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, Palmerston North, New Zealand. 4-6 February 1993. 161-164.
  51. Maclean, B.; Matthew, C.; Latch, G.C.M.; Barker, D.J. 1993. The effect of endophyte on drought resistance in tall fescue. Proceedings of the Second International Symposium on Acremonium/Grass Interactions, Palmerston North, New Zealand. 4-6 February 1993. 165-169.
  52. Mir Hosseini Dehabadi, S.R., Kemp, P.D.; Barker, D.J.; Hodgson, J. 1994: Physiological and morphological responses of lucerne to soil moisture stress. Proceedings of the International Symposium on Grassland Resources. 15-20 August 1993, Hohhot, China. pp 661-672.
  53. Awan, M.H.; Barker, D.J.; Kemp, P.D.; Choudary, M.A. 1994: Effect of sowing rate on herbage yield of four legume species oversown in hill. Proceedings of the Agronomy Society of New Zealand 24: 9-14.
  54. Nie, Z.N.; Valentine, I.; Mackay, A.D.; Barker, D.J.; Hodgson, J. 1995: Long-term effects of pastoral fallowing on white clover (Trifolium repens L.) and grass growth in a hill pasture. In White clover: New Zealand’s competitive edge. Agronomy Society of New Zealand Special Publication No. 11, New Zealand Grassland Association Research and Practise Series No. 6, Lincoln University, New Zealand, 21-22 November, 1995. ed. D.R. Woodfield. p 75-78.
  55. Faulalo, K.; Hedley, M.J.; del Pino Machado, A.S.; Mackay, A.D.; Barker D.J. 1996: The development of a pasture growth model based on predicted evapotranspiration and soil fertility status. Proceedings of the Australian Soil Science Society submitted
  56. Barker, D.J.; Dymock, N. 1997: The interaction between root distribution and pasture production during water deficit.Proceedings of the XVIII International Grassland Congress, Canada. Session 7 p. 31.
  57. Barker, D.J.; Hume, D.E.; Quigley, P.E. 1997: Negligible physiological responses to water deficit in endophyte-infected and uninfected perennial ryegrass. Proceedings of the Third International Symposium on Neotyphodium/Grass Interactions, Athens, GA, USA. 28-31 May 1997. 137-140.
  58. Assuero, S.; Mazzanti, A.; Barker, D.J.; Matthew, C. 1997: Reducing and fructosyl sugar contents of two contrasting tall fescue cultivars in response to water stress. Proceedings of the Agronomy Society of NZ (in press)
  59. Awan, M.H.; Kemp, P.D.; Barker, D.J.; Choudary, M.A. 1997: Development and fate of three temperate legumes following oversowing. Proceedings of the XVIII International Grassland Congress, Canada. Session 22 p. 39.
  60. Nicholas, P.K.; Kemp, P.D.; Barker, D.J.; Brock, J.L.; Grant, D.A. 1997: Production, stability and biodiversity of North Island New Zealand hill pastures. Proceedings of the XVIII International Grassland Congress, Canada. Session 21 p. 9.
  61. Nie, Z.N.; Valentine, I.; Barker, D.J.; Mackay, A.D.; Hodgson, J. 1997: 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, Canada. Session 22 p. 109.
  62. Barker, D.J.; Christensen, M.J.; Wever, A.C. 1997: Application of endophyte allozyme analysis to Lolium perenne population ecology in hill country pasture. Proceedings of the Third International Symposium on Neotyphodium/Grass Interactions, Athens, GA, USA. 28-31 May 1997. pp 41-44.
  63. Lane, G.A.; Tapper, B.A.; Davies, E.; Hume, D.E.; Latch, G.C.M.; Barker, D.J.; Easton, H.S.; Rolston, M.P. 1997: Effect of growth conditions on alkaloid concentrations in perennial ryegrass naturally infected with endophyte. Proceedings of the Third International Symposium on Neotyphodium/Grass Interactions, Athens, GA, USA. 28-31 May 1997. pp 179-182.
  64. Nicholas, P.K.; Kemp, P.D.; Barker, D.J. 1998: Biodiversity, stability and pasture management - the role of functional groups. Proceedings of the 9th Australian Agronomy Conference, Wagga Wagga pp 294-297.
  65. Kemp, P.D.; Barker, D.J.; Valentine, I.; Awan, M.H.; Nie, Z.N. 1998: Oversowing legumes into perennial pasture: can we do it better? Proceedings of the 9th Australian Agronomy Conference, Wagga Wagga pp 273-275.
  66. Mackay, A.D.; Lambert, M.G.; Barker, D.J. 1999: Effect of intensification of livestock farming on the physical properties of a hill soil. Proceedings of the 1999 Fertiliser and Lime Research Center Conference , Massey University.

  67. Moore, K.J.; Barker, D.J. 2001: Determining pasture biodiversity with NIRS. Proceedings of the XIX International Grassland Congress, Brazil. Pp 907-908

  68. 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.

Other Publications

  1. Barker, D.J. 1992. Recent and current results from Bromus spp., Maru, and Wana in hill country. AgResearch Science and Technology Transfer Workshop, Lincoln.
  2. Mackay, A.D.; Betteridge, K.; Barker, D.J.; Shepherd, T.G. 1994: Hill farms: the impact of stock treading on soil. Farm Progress (New Zealand Farmer): June, p 47.
  3. Barker, D.J.; Mackay, A.D.; Betteridge, K. 1994: Bull Production: Some issues in North Island, New Zealand hill country. Agricultural Science: in press.
  4. Barker, D.J. 1994: Book review: Pasture Management - Technology for the 21st Century. D. R. Kemp, and D. L. Michalk (Editors). CSIRO, Victoria, Australia, Field Crops Research 38: 122-123.
  5. Lambert, M.G.; Barker, D.J.; Mackay, A.D.; Springett, J.A.; Krause, M.K.; Rhodes, A.P. 1995: Indicators of Farm Resource Status. Proceedings of the Soil and Land Indicators Workshop, Napier, 30 November, in press.
  6. Barker, D.J.; Springett, J.A.; Lambert, M.G.; Mackay, A.D.; Kemp, P.D.; Nicholas, P.K.1997: Anthropogenic Impacts on Some Indigenous Species in North Island, New Zealand, Hill Country Pasture. Paper presented to “Nature Conservation in Production Environments: Managing the Matrix” 1-5 December 1997, Taupo, NZ.
  7. Moore, K.J.; Barker, D.J. 1999: Hill Country Biodiversity, Production and Quality. Agronomy Abstracts pg 149.

  8. 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 – Bay of Islands 8-12 Feb 2000.
  9. Barker, D.J.; Moore, K.J. 2000: Species Richness Across Diverse Pasture Landscapes. Agronomy Abstracts pg 179.