Guy McMullen

Research interests

  • Winter and Summer Crop Agronomy
  • Water use efficiency
  • Soil organic matter
  • Fertiliser use efficiency


Guy McMullen is Research Agronomist based at the Tamworth Agricultural Institute. He joined NSW Agriculture* in 2002 working in the northern grains region. He has also worked as Research Agronomist at Wagga Wagga in southern NSW investigating a range of issues including grazing management of dual purpose wheats, wheat agronomy and precision agriculture.

Guy returned to the northern grains region in 2007 to work on several projects in the northern grains region. He currently leads the Northern Barley Agronomy project working closely with collaborators at QDPI&F and with similar projects in southern and western Australia. Guy also coordinates the NSW DPI Northern Barley Evaluation group evaluating breeding lines from Barley Breeding Australia.

Guy also works closely with the Northern Growers Alliance, a GRDC funded grower group that works closely with agribusiness and advisors to set research priorities in the northern region and address these with appropriate research and extension programs.

*NSW Department of Primary Industries was formed on July 1, 2004 through an amalgamation of NSW Agriculture, NSW Fisheries, State Forests of NSW and the NSW Department of Mineral Resources.


  • B.Rur.Sci. (Hons, UNE)
  • PhD (UNE)

Current projects

  • Agronomic management of barley in the northern grains region.
  • Evaluation of elite barley lines for Barley Breeding Australia - North
  • Northern Growers Alliance – North Eastern Farming Systems

Recent publications

McMullen G, Fettell N, Morphett S, Sturgess J and McIntyre K. (2008) Barley varieties and their management. GRDC Update – Goondiwindi

Schwenke G and McMullen G (2008) Nitrogen volatilisation in northern cropping soils. GRDC Update – Goondiwindi

McKenzie P, Poole N, Bowring A, Southwell R, McMullen G, Mitchell A, Schwenke G and Butler G. (2008) Canopy management in short season crops in northern NSW. GRDC Update – Goondiwindi.

Dove H, McMullen G and Kelman W. (2007) Growth rate responses to magnesium or sodium supplements in lambs grazing dual-purpose wheats Journal of Animal and Feed Sciences 16, pp465-470.

Virgona J, McMullen G, Angus J, Muir C and Gummer F (2006) Grazing management and the yield of winter wheat in southern NSW - experiments in 2004 and 2005, GRDC Updates - Southern Region.

McMullen G and Haskins B (2005) Evaluating stripe rust management strategies for wheat in SW NSW in 2004 and 2005, GRDC Updates - Southern Region.

McMullen G and Virgona J (2006) Managing dual-purpose wheats for grazing and grain, GRDC Update – Southern Region

Fields of research

  • 070305 Crop and Pasture Improvement (Selection and Breeding)
  • 070302 Agronomy

Australian and New Zealand Standard Research Classification (ANZSRC)

Keyword/phrase list of research interests

  • Water use efficiency
  • Fertiliser management
  • Crop agronomy
  • Soil organic matter

Contact details