84 research outputs found
Emission spectra and intrinsic optical bistability in a two-level medium
Scattering of resonant radiation in a dense two-level medium is studied
theoretically with account for local field effects and renormalization of the
resonance frequency. Intrinsic optical bistability is viewed as switching
between different spectral patterns of fluorescent light controlled by the
incident field strength. Response spectra are calculated analytically for the
entire hysteresis loop of atomic excitation. The equations to describe the
non-linear interaction of an atomic ensemble with light are derived from the
Bogolubov-Born-Green-Kirkwood-Yvon hierarchy for reduced single particle
density matrices of atoms and quantized field modes and their correlation
operators. The spectral power of scattered light with separated coherent and
incoherent constituents is obtained straightforwardly within the hierarchy. The
formula obtained for emission spectra can be used to distinguish between
possible mechanisms suggested to produce intrinsic bistability.Comment: 18 pages, 5 figure
Optimisation of piston compression ring for improved energy efficiency of high performance race engines
The primary function of the piston compression ring is to seal the combustion chamber from the bottom end of the engine. As a result, its conformance to the cylinder liner surface is of prime importance. This close-contact contiguity results in increased friction, making this contact conjunction responsible for a significant proportion of energy losses. The frictional losses can be as much as 2–6% of the expended fuel energy, which is quite significant for such a diminutive contact. Under these conditions, the geometrical profile, the surface topography and the inertial properties of the ring assume significant importance. The paper presents an integrated mixed-hydrodynamic analysis of the compression ring–cylinder liner contact with multi-parameter optimisation, based on the use of a genetic algorithm. The multi-objective functionality includes minimisation of the parasitic energy loss, reduction in the incidence of asperity level interactions as well as minimisation of the ring mass. Both cold running engine conditions and hot running engine conditions in line with the New European Drive Cycle were considered. Hitherto, such an approach has not been reported in the literature
Message in a Bottle -- An Update to the Golden Record
Communication is an essential asset enabling humankind to forge an advanced
civilization. Using approximately 31,000 languages from the Stone Age to our
present digital information society, humans have connected and collaborated to
accomplish remarkable feats. As the newly dawned Space Age progresses, we are
attempting to communicate with intelligent species beyond our world, on distant
planets and in Earth's far future. Absent mutually understood signs, symbols,
and semiotic conventions, this study, the "Message in a Bottle", uses
scientific methods to assess and design a means of communication encapsulating
the story of humanity, conveying our thoughts, emotions, ingenuity, and
aspirations. The message will be structured to provide a universal yet
contextual understanding of modern human society, evolution of life on Earth,
and challenges for the future. In assembling this space and time capsule, we
aim to energize and unite current generations to celebrate and preserve
humanity
Algorithmic Self-Assembly of DNA Sierpinski Triangles
Algorithms and information, fundamental to technological and biological organization, are also an essential aspect of many elementary physical phenomena, such as molecular self-assembly. Here we report the molecular realization, using two-dimensional self-assembly of DNA tiles, of a cellular automaton whose update rule computes the binary function XOR and thus fabricates a fractal pattern—a Sierpinski triangle—as it grows. To achieve this, abstract tiles were translated into DNA tiles based on double-crossover motifs. Serving as input for the computation, long single-stranded DNA molecules were used to nucleate growth of tiles into algorithmic crystals. For both of two independent molecular realizations, atomic force microscopy revealed recognizable Sierpinski triangles containing 100–200 correct tiles. Error rates during assembly appear to range from 1% to 10%. Although imperfect, the growth of Sierpinski triangles demonstrates all the necessary mechanisms for the molecular implementation of arbitrary cellular automata. This shows that engineered DNA self-assembly can be treated as a Turing-universal biomolecular system, capable of implementing any desired algorithm for computation or construction tasks
Crop Updates 1999 - Oilseeds
This article contains eighteen papers
INTRODUCTION, Paul Carmody, Agriculture Western Australia
PLENARY SESSION
Transgenic canola in Western Australia: Outlook and challenges, Phil Salisbury, University of Melbourne
Farming system issues for herbicide tolerant canola, Rick Madin, Rick Madin and Associates, David Bowran, Agriculture Western Australia
Beating blackleg in 1999, Martin Barbetti, Ravjit Khangura, Paul Carmody, Graham Walton, Agriculture Western Australia
The Mustard Industry in Australia – Opportunities for a new oilseed, Phil Parker, NSW Agriculture
Management of blackleg with fungicides, Ravjit Khangura and Martin Barbetti, Agriculture Western Australia
Effect of aphid feeding damage on canola yields in 1998, Francoise Berlandier and Linnet Cartwright, Agriculture Western Australia
Post-anthesis duration and rainfall affect oil content of canola, Ping Si, University of West Australia, Graham Walton, Agriculture Western Australia, Nick Galwey and David Turner, University of West Australia
Canola responded to high rates of fertiliser in 1998, Wayne Pluske, CSBP
Impact of agronomic practices on canola quality, Graham Walton, Agriculture Western Australia
Survey reveals widespread infection with two virus diseases in Western Australian canola crops, Roger Jones and Brenda Coutts, Agriculture Western Australia
Calculating canola yields and oil contents as a function of soil and fertiliser nitrogen supply, Bill Bowden and Isabel Arevalo-Vigne, Agriculture Western Australia
Canola benchmarks 1997/98 – Central Eastern District, Jeff Russell, Agriculture Western Australia
Seeding rate affects the yield and some architectural features of canola, Syed H. Zaheer, Nick W. Galwey and David Turner, University of Western Australia
Foliar applied fungicides for blackleg, Andrew Simon and Art Diggle, Agriculture Western Australia
Farm based demonstration 1998 canola N – Wheel evaluation, Jeff Russell, Agriculture Western Australia
Effect of sowing date on seed yield of canola, Dave Eksteen, Agriculture Western Australia
Investigating water use of summer crops on the South Coast of Western Australia, Arjen Ryder, Agriculture Western Australia, Bill Crabtree, Western Australia No Till Farming Association, Serena Wyatt, Catchment Landcare Coordinator, Wellstead, Jim Baily, Subasio Downs, Wellstead
INTRODUCTION, Paul Carmody, Agriculture Western Australia
PLENARY SESSION
Transgenic canola in Western Australia: Outlook and challenges, Phil Salisbury, University of Melbourne
Farming system issues for herbicide tolerant canola, Rick Madin, Rick Madin and Associates, David Bowran, Agriculture Western Australia
Beating blackleg in 1999, Martin Barbetti, Ravjit Khangura, Paul Carmody, Graham Walton, Agriculture Western Australia
The Mustard Industry in Australia – Opportunities for a new oilseed, Phil Parker, NSW Agriculture
Management of blackleg with fungicides, Ravjit Khangura and Martin Barbetti, Agriculture Western Australia
Effect of aphid feeding damage on canola yields in 1998, Francoise Berlandier and Linnet Cartwright, Agriculture Western Australia
Post-anthesis duration and rainfall affect oil content of canola, Ping Si, University of West Australia, Graham Walton, Agriculture Western Australia, Nick Galwey and David Turner, University of West Australia
Canola responded to high rates of fertiliser in 1998, Wayne Pluske, CSBP
Impact of agronomic practices on canola quality, Graham Walton, Agriculture Western Australia
Survey reveals widespread infection with two virus diseases in Western Australian canola crops, Roger Jones and Brenda Coutts, Agriculture Western Australia
Calculating canola yields and oil contents as a function of soil and fertiliser nitrogen supply, Bill Bowden and Isabel Arevalo-Vigne, Agriculture Western Australia
Canola benchmarks 1997/98 – Central Eastern District, Jeff Russell, Agriculture Western Australi
Crop Updates 2000 - Oilseeds
This session covers seventeen papers from different authors:
Introduction, Paul Carmody, Centre for Cropping Systems
CANOLA AGRONOMY
2. Genotype, location and year influence the quality of canola grown across southern Australia, PingSi1, Rodney Mailer2, Nick Galwey1 and David Turner1, 1Plant Sciences, Faculty of Agriculture, The University of Western Australia, 2Agricultural Research Institute, New South Wales Agriculture
3. Development of Pioneer® Canola varieties for Australian market,Kevin Morthorpe, StephenAddenbrooke, Pioneer Hi-Bred Australia Pty Ltd
4. Canola, Erucic Acid, Markets and Agronomic Implications, Peter Nelson, The Grain Pool of Western Australia
5. The control of Capeweed in Clearfield Production System for Canola, Mike Jackson and ScottPaton, Cyanamid Agriculture Pty Ltd
6. Responsiveness of Canola to Soil Potassium Levels: How Low Do We Have To Go? Ross Brennan, Noeleen Edwards, Mike Bolland and Bill Bowden,Agriculture Western Australia
7. Adaption of Indian Mustard (Brassica juncea) in the Mediterranean Environment of South Western Australia, C.P. Gunasekera1, L.D. Martin1, G.H. Walton2 and K.H.M. Siddique2 1Muresk Institute of Agriculture, Curtin University of Technology, Northam, 2Agriculture Western Australia
8. Physiological Aspects of Drought Tolerance in Brassica napus and B.juncea, Sharon R. Niknam and David W. Turner, Plant Sciences, Faculty of Agriculture, The University of Western Australia
9. Cross resistance of chlorsulfuron-resistant wild radish to imidazolinones, Abul Hashem, Harmohinder Dhammu and David Bowran, Agriculture Western Australia
10. Canola Variety and PBR Update 2000, From The Canola Association of Western Australia
11. Development of a canola ideotype for the low rainfall areas of the western Australian wheat belt, Syed H. Zaheer, Nick W. Galwey and David W. Turner, Faculty of Agriculture, The University of Western Australia
DISEASE MANAGEMENT
12. Evaluation of fungicides for the management of blackleg in canola, Ravjit Khangura and Martin J. Barbetti, Agriculture Western Australia
13. Impact-IFÃ’: Intergral in the control of Blackleg, Peter Carlton, Trials Coordinator, Elders Limited
14. Forecasting aphid and virus risk in canola, Debbie Thackray, Jenny Hawkes and Roger Jones, Agriculture Western Australia and Centre for Legumes in Mediterranean Agriculture
15. Beet western yellow virus in canola: 1999 survey results, wild radish weed reservoir and suppression by insecticide, Roger Jones and Brenda Coutts, Agriculture Western Australia
16. Are canola crops resilient to damage by aphids and diamond back moths? Françoise Berlandier, Agriculture Western Australia
ECONOMIC OUTLOOK
17. Outlook for prices and implications for rotations, Ross Kingwell1,2, Michael O’Connell1 and Simone Blennerhasset11Agriculture Western Australia 2University of Western Australi
Crop Updates 2000 Cereals - part 4
This session covers twelve papers from different authors:
BREEDING
1.Response to subsoil acidity of wheat genotypes differing in Al-tolerance, C. Tang, Z. Rengel, E. Diatloff and B. McGann, Soil Science and Plant Nutrition/CLIMA, University of Western Australia
2. Application of molecular markers in Barley Improvement, Mehmet Cakir1, Nick Galwey1 and David Poulsen2, 1Plant Sciences, Faculty of Agriculture, University of Western Australia, 2Queensland Department of Primary Industries, Hermitage Research Station, Queensland
3. Implementation of molecular markers for wheat improvement in the Western Region, M. Carter1, A. Briney1, R. Wilson2, R.H. Potter1 and M.G.K. Jones1, 1Western Australian State Agricultural Biotechnology Centre, Murdoch University, 2Crop Industries, Agriculture Western Australia
4. Performance in 1999 of recently released wheat varieties in Western Australia, Robin Wilson, Iain Barclay, Robyn McLean, Dean Diepeveen and Robert Loughman, Agriculture Western Australia
ECONOMICS
5. Outlook for prices and implications for rotations, Ross Kingwell1 2, Michael O’Connell1, Simone Blennerhasset1 1Agriculture Western Australia, 2University of Western Australia
6. Price Risk Management and the Western Australian Grain Producer, Benjamin Michael Tiller, Muresk Institute of Agriculture
FORECASTING
7. Can we forecast wheat yields in Western Australia, Senthold Asseng1, Holger Meinke2, and Bill Bowden3, 1CSIRO Plant Industry, 2 APSRU/DPI, 3Agriculture Western Australia
ON FARM TESTING
8. On-farm testing, the quiet revolution continues, Jeff Russell1, Ivan Lee2 1Agriculture Western Australia, 2 Farmer Kunjin TopCrop group, Corrigin
GRAIN STORAGE
9. CD-ROM tool for growers and advisers: Managing on-farm grain storage – effective practices for the delivery of quality assured products, Clare Johnson1, Chris Newman2 1Quality Wheat CRC Ltd, 2Production Resource Protection Services, Agriculture Western Australia
10. The Internet as a tool for managing grain insects, Robert Emery, Romolo Tassone and Ernestos Kostas, Agriculture Western Australia
SUMMER CROPS AND WINDBREAK EFFECT ON YIELD
11. Summer crop Update and agronomic considerations, Graeme Ralph, Pioneer Hi-Bred Australia Pty Ltd
12. The effect of tree windbreaks on grain yield in the medium and low rainfall areas in Western Australia, Robert Sudmeyer, David Hall and Harvey Jones, Agriculture Western Australi
Crop Updates 1999 - Lupins
This article contains twenty three papers
1998 LUPIN HIGHLIGHTS
LUPIN ANTHRACNOSE
1. Anthracnose overview, Greg Shea, Geoff Thomas and Mark Sweetingham, Agriculture Western Australia
2. Anthracnose – Critical seed infection levels for resistant and susceptible varieties, Geoff Thomas, Mark Sweetingham, Bill O\u27Neill and Greg Shea, Agriculture
Western Australia
3. Fungicide seed treatment for anthracnose and brown spot control in lupin, G. Thomas and M. Sweetingham, Agriculture Western Australia
LUPIN BREEDING AND AGRONOMY
4. Anthracnose resistance in lupins – an innovative Australian research effort 1996-1998, Wallace Cowling1\u272, Bevan Buirchell1,2 Mark Sweetinqham1,2, Hua\u27an Yang2,
Geoff Thomas 1, David Luckett3, Allan Brown4 and John Hamblin2, 1 Agriculture Western Australia, 2 Centre for Legumes in Mediterranean Agriculture, University of Western Australia, 3 NSW Agriculture, Agricultural Institute, Wagga Wagga, NSW, 4 Consultant, 16 Rochester Way, Dianella, WA
5. Gene transfer to pulses: Challenges through 1989-99. Joanne E. Barton, Centre for Legumes in Mediterranean Agriculture, University of Western Australia
6. Can we select for restricted branching in narrow-leafed lupin (Lupinus angustifolius) Kedar Adhikari1, Nick Galwey1and Miles Dracup2, 1Plant Sciences, Faculty of Agriculture, The University of Western Australia,2 Agriculture Western Australia
7. Getting the beat out of new lupin varieties, Dr Bob French, Grain Legume Agronomist, Agriculture Western Australia
8. Starter nitrogen on lupins, Dr Bob French, Grain Legume Agronomist, Agriculture Western Australia
APHIDS AND VIRUS CONTROL
9. Forecasting aphid and virus risk in lupins, Debbie Thackray and Roger Jones, CRC for Legumes in Mediterranean Agriculture and Agriculture Western Australia
10. Screening for resistance to cucumber mosaic virus in lupins, Roger Jones, Brenda Coutts, Narelle Reeve, Wallace Cowling and Bevan Buirchell, Agriculture Western Australia and CRC for Legumes in Mediterranean Agriculture
11. The non-necrotic strain of bean yellow mosaic virus spreads faster than the necrotic strain in lupins, Y. Cheng 1 and R.A.C. Jones 1•2, 1 Cooperative Research Centre for Legumes in Mediterranean Agriculture, 2 Agriculture Western Australia
12. Spraying to control aphid feeding damage increases yields of some lupin varieties and faba bean, Francoise Berlandier and Linnet Cartwright, Entomology, Agriculture Western Australia
LUPIN NUTRITION
13. Calculated lime requirements for rotations, James Fisher1, Art Diggle 1•2 and Bill Bowden 1•2, 1 Centre for Legumes in Mediterranean Agriculture, 2 Agriculture Western Australia
14. What does lime do to acidic soils – lupin nutrition, Chris Gazey, Research Officer, Agriculture Western Australia
15. Effect of application method of manganese fertiliser and manganese concentration of seed source on seed yield of lupins grown in the West Midlands,
Luigi Moreschi, CSBP Area Manager
HERBICIDE TOLERANCE AND WEED CONTROL
16. Herbicide tolerance of lupins, Terry Piper, Weed Science Group, Agriculture Western Australia
17. Weed control in Wodjil yellow lupins, Terry Piper, Weed Science Group, Agriculture Western Australia
18. Herbicide tolerance of new lupin varieties, Peter Newman, Agronomist, Elders Mingenew
19. Control of volunteer canola in lupins, Terry Piper and Dave Nicholson, Weed Science Group, Agriculture Western Australia
LUPIN ESTABLISHMENT
20. A new seed pressing system for healthy lupin establishment and productivity, Mohammad Amjad, Glen Riethmuller and Ron Jarvis, Agriculture Western
Australia
21. Encouragement for controlled traffic farming in the Northern Wheatbelt, Paul Blackwell, Agriculture Western Australia
LUPIN HARVESTING
22. Improved lupin harvesting efficiency with different knife guard extensions, Glen Riethmuller, Agriculture Western Australia
LUPIN AND PULSE UTILISATION
23. The value of pulse grains for sheep, C.L. White, CSIRO Division of Animal Productio
Crop Updates 2001 - Cereals
This session covers forty two papers from different authors:
PLENARY
1. Planning your cropping program in season 2001, Dr Ross Kingwell, Agriculture Western Australia and University of Western Australia
WORKSHOP
2. Can we produce high yields without high inputs? Wal Anderson, Centre for Cropping Systems, Agriculture Western Australia
VARIETIES
3. Local and interstate wheat variety performance and $ return to WA growers, Eddy Pol, Peter Burgess and Ashley Bacon, Agritech Crop Research
CROP ESTABLISHMENT
4 Soil management of waterlogged soils, D.M. Bakker, G.J. Hamilton, D. Houlbrooke and C. Spann, Agriculture Western Australia
5. Effect of soil amelioration on wheat yield in a very dry season, M.A Hamza and W.K. Anderson, Agriculture Western Australia
6. Fuzzy tramlines for more yield and less weed, Paul Blackwell1 and Maurice Black2 1Agriculture Western Australia, 2Harbour Lights Estate, Geraldton
7. Tramline farming for dollar benefits, Paul Blackwell, Agriculture Western Australia
NUTRITION
8. Soil immobile nutrients for no-till crops, M.D.A. Bolland1, R.F. Brennan1,and W.L. Crabtree2, 1Agriculture Western Australia, 2Western Australian No-Tillage Farmers Association
9. Burn stubble windrows: to diagnose soil fertility problems, Bill Bowden, Chris Gazey and Ross Brennan, Agriculture Western Australia
10. Calcium: magnesium ratios; are they important? Bill Bowden1, Rochelle Strahan2, Bob Gilkes2 and Zed Rengel2 1Agriculture Western Australia, 2Department of Soil Science and Plant Nutrition, UWA
11. Responses to late foliar applications of Flexi-N, Stephen Loss, Tim O’Dea, Patrick Gethin, Ryan Guthrie, Lisa Leaver, CSBP futurefarm
12. A comparison of Flexi-N placements, Stephen Loss, Tim O’Dea, Patrick Gethin, Ryan Guthrie, Lisa Leaver, CSBP futurefarm
13. What is the best way to apply potassium? Stephen Loss, Tim O’Dea, Patrick Gethin, Ryan Guthrie, CSBP futurefarm
14. Claying affects potassium nutrition in barley, Stephen Loss, David Phelps, Tim O’Dea, Patrick Gethin, Ryan Guthrie, Lisa Leaver, CSBP futurefarm
15. Nitrogen and potassium improve oaten hay quality, Stephen Loss, Tim O’Dea, Patrick Gethin, Ryan Guthrie, Lisa Leaver, CSBP futurefarm
AGRONOMY
16. Agronomic responses of new wheat varieties in the northern wheatbelt, Darshan Sharma and Wal Anderson, Agriculture Western Australia
17. Wheat agronomy research on the south coast, Mohammad Amjad and Wal Anderson, Agriculture Western Australia
18. Influence of sowing date on wheat yield and quality in the south coast environment, Mohammad Amjadand Wal Anderson, Agriculture Western Australia
19. More profit from durum, Md.Shahajahan Miyan and Wal Anderson, Agriculture Western Australia
20. Enhancing recommendations of flowering and yield in wheat, JamesFisher1, Senthold Asseng2, Bill Bowden1 and Michael Robertson3 ,1AgricultureWestern Australia, 2CSIRO Plant Industry, 3CSIRO Sustainable Ecosystems
21. When and where to grow oats, Glenn McDonald, Agriculture Western Australia
22. Managing Gaidner barley for quality, Kevin Young and Blakely Paynter, Agriculture Western Australia
PESTS AND DISEASES
23. Strategies for leaf disease management in wheat, Jatinderpal Bhathal1, Cameron Weeks2, Kith Jayasena1 and Robert Loughman1 ,1Agriculture Western Australia. 2Mingenew-Irwin Group Inc
24. Strategies for leaf disease management in malting barley, K. Jayasena1, Q. Knight2 and R. Loughman1, 1Agriculture Western Australia, 2IAMA Agribusiness
25. Cereal disease diagnostics, Dominie Wright and Nichole Burges, Agriculture Western Australia
26. The big rust: Did you get your money back!! Peter Burgess, Agritech Crop Research
27. Jockey – winning the race against disease in wheat, Lisa-Jane Blacklow, Rob Hulme and Rob Giffith, Aventis CropScience
28. Distribution and incidence of aphids and barley yellow dwarf virus in over-summering grasses in WA wheatbelt, Jenny Hawkes and Roger Jones, CLIMA and Agriculture Western Australia
29. Further developments in forecasting aphid and virus risk in cereals, Debbie Thackray, Jenny Hawkes and Roger Jones, Agriculture Western Australia and Centre for Legumes in Mediterranean Agriculture
30. Effect of root lesion nematodes on wheat yields in Western Australia, S. B. Sharma, S. Kelly and R. Loughman, Crop Improvement Institute, Agriculture Western Australia
31. Rotational crops and varieties for management of root lesion nematodes in Western Australia, S.B. Sharma, S. Kelly and R. Loughman, Crop Improvement Institute, Agriculture Western Australia
WEEDS
32. Phenoxy herbicide tolerance of wheat, Peter Newman and Dave Nicholson, Agriculture Western Australia
33. Tolerance of wheat to phenoxy herbicides,Harmohinder S. Dhammu, Terry Piper and Mario F. D\u27Antuono, Agriculture Western Australia
34. Herbicide tolerance of durum wheats, Harmohinder S. Dhammu, Terry Piper and David Nicholson, Agriculture Western Australia
35. Herbicide tolerance of new wheats, Harmohinder S. Dhammu, Terry Piper and David F. Nicholson, Agriculture Western Australia
BREEDING
36. Towards molecular breeding of barley: construction of a molecular genetic map, Mehmet Cakir1, Nick Galwey1, David Poulsen2, Garry Ablett3, Reg Lance4, Rob Potter5 and Peter Langridge6,1Plant Sciences, Faculty of Agriculture, UWA, 2Queensland Department of Primary Industries, Qld, 3Centre for Plant Conservation Genetics Southern Cross University, Lismore NSW, 5SABC Murdoch University, WA, 6Department of Plant Science University of Adelaide, Glen Osmond SA
37. Toward molecular breeding of barley: Identifying markers linked to genes for quantitative traits, Mehmet Cakir1, Nick Galwey1, David Poulsen2, Reg Lance3, Garry Ablett4, Greg Platz2, Joe Panozzo5, Barbara Read6, David Moody5, Andy Barr7 and Peter Langridge7 , 1Plant Sciences, Faculty of Agriculture, UWA, 2Queensland Department of Primary Industries, Warwick, QLD,3Agriculture Western Australia, 4Centre for Plant Conservation Genetics, Southern Cross University, Lismore NSW, 5VIDA Private Bag 260, Horsham VIC, 6NSW Dept. of Agriculture, Wagga Wagga NSW, 7Department of Plant Science, University of Adelaide, Glen Osmond SA
38. Can we improve grain yield by breeding for greater early vigour in wheat? Tina Botwright1, Tony Condon1, Robin Wilson2 and Iain Barclay2, 1CSIRO Plant Industry, 2Agriculture Western Australia
MARKETING AND QUALITY
39. The Crop Improvement Royalty, Howard Carr, Agriculture Western Australia
40. GrainGuardÔ - The development of a protection plan for the wheat industry, Greg Shea, Agriculture Western Australia
CLIMATE
41. Rainfall – what happened in 2000 and the prospects for 2001, Ian Foster, Agriculture Western Australia
42. Software for climate management issues, David Tennant,Agriculture Western Australia
CONTRIBUTING AUTHOR CONTACT DETAIL
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