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Full-Text Articles in Life Sciences

The Evolutionary Genetics Of Seed Shattering And Flowering Time, Two Weed Adaptive Traits In Us Weedy Rice, Carrie S. Thurber Sep 2012

The Evolutionary Genetics Of Seed Shattering And Flowering Time, Two Weed Adaptive Traits In Us Weedy Rice, Carrie S. Thurber

Open Access Dissertations

Weedy rice is a persistent weed of cultivated rice (Oryza sativa) fields worldwide, which competes with the crop and drastically reduces yields. Within the US, two main populations of genetically differentiated weedy rice exist, the straw-hulled (SH) group and the black-hulled awned (BHA) group. Current research suggests that both groups are derived from Asian cultivated rice. However, the weeds differ from the cultivated groups in various morphological traits. My research focus is on the genetic basis of two such traits: seed shattering ability and differences in flowering time. The persistence of weedy rice has been partly attributed to its ability ...


Diversifying Monoculture Crops By Incorporating Prairie Buffer Strips, Sarah Marie Hirsh Jan 2012

Diversifying Monoculture Crops By Incorporating Prairie Buffer Strips, Sarah Marie Hirsh

Graduate Theses and Dissertations

Monoculture crop production and prevailing farming practices have greatly reduced perennial plants on the landscape and nearly eliminated native Iowa prairie vegetation. The STRIPs (Science-based Trials of Row crops Integrated with Prairies) project is a watershed-scale experiment at the Neal Smith National Wildlife Refuge, in Jasper County, Iowa, US, in which strips of prairie vegetation were planted within watersheds of corn (Zea mays) and soybean (Glycine max) production to aid in soil and water conservation. The project includes 12 0.5- to 3.2-ha watersheds. Nine watersheds included buffer strips in one of three design treatments that varied the number ...


Crop Updates 2010 - Genetically Modified Crops, Nutrition And Soils, James Fisher, Désirée Futures, Peter Tozer, Mike Jackson, John Moore, Jamees Neilsen, Geoff Anderson, Wen Chen, Richard Bell, Paul Blackwell, Allan Herbert, Stephen Davies, Ross Brennan, Mike Bolland, James Easton, Ryan Guthrie, Rowan Madderm, Robert Belford, Wal Anderson, Ian Edwards, Reg Lunt, Bill Bowden, Nigel Metz, Peter Newman, Breanne Best, Chris Gazey, Joel Andrew Feb 2010

Crop Updates 2010 - Genetically Modified Crops, Nutrition And Soils, James Fisher, Désirée Futures, Peter Tozer, Mike Jackson, John Moore, Jamees Neilsen, Geoff Anderson, Wen Chen, Richard Bell, Paul Blackwell, Allan Herbert, Stephen Davies, Ross Brennan, Mike Bolland, James Easton, Ryan Guthrie, Rowan Madderm, Robert Belford, Wal Anderson, Ian Edwards, Reg Lunt, Bill Bowden, Nigel Metz, Peter Newman, Breanne Best, Chris Gazey, Joel Andrew

Crop Updates

GENETICALLY MODIFIED CROPS

1. Evaluation of the environmental and economic impact of Roundup Ready® canola in the Western Australian crop production system, James Fisher and Désirée Futures, York, Western Australia, Peter Tozer, PRT Consulting, Armidale NSW

2. Controlling wild radish (Raphanus raphanistrum) in Roundup Ready®1 Canola: Outcomes from the Nufarm 2009 Roundup Ready small plot trial Program, Mike Jackson, Nufarm Australia Limited

3. Weed strategies for glyphosate tolerant crops, John Moore, Department of Agriculture and Food

4. Results of the 2009 Western Australia Roundup Ready® canola trials, Dr James Neilsen, Canola Systems Specialist, Monsanto Australia

NUTRITION

5. Modelling P ...


Use Of Short-Term Floods As An Additional Management Strategy For Controlling Dodder (Cuscuta Gronovii Willd.) In Commercial Cranberry Production, James M. O'Connell Jan 2010

Use Of Short-Term Floods As An Additional Management Strategy For Controlling Dodder (Cuscuta Gronovii Willd.) In Commercial Cranberry Production, James M. O'Connell

Masters Theses 1911 - February 2014

Dodder (Cuscuta gronovii Willd.) is a weed of serious concern to cranberry (Vaccinium macrocarpon Ait.) growers. It develops vigorously and has a long-lived seed bank. Cranberries are a perennial crop and therefore strategies available to growers of annual crops are not practical. Herbicides, the primary management tool for dodder, although effective, have a narrow window of application and extended seedling emergence after applications can result in escapes. This project examined the effect of water temperature on dodder seed germination and the use of short-term floods (less than 72 hr) for dodder management.

Experiments investigated the effect of water temperature on ...


Crop Updates 2009 - Cereals, Jeff Baldock, Doug Edmeades, Mark Seymour, Paul Carmody, Ian Pritchard, Alan Meldrum, Michael Robertson, Roger Lawes, Rob Sands, Peter White, Felicity Byrne, Andrew Bathgate, Kedar Adhikari, Tanveer Khan, Stuart Morgan, Alan Harris, P. Gaur, K. M. H. Siddique, H. Clarke, N. C. Turner, W. Macleod, S. Morgan, Chris Veitch, Tony Leonforte, Kith Jayasena, Geoff Thomas, Rob Loughman, Kazue Tanaka, Ravjit Khangura, M. Amjad, Richard Oliver, Dusty Severtson, Peter Mangano, John Botha, Brenda Coutts, Manisha Shankar, Kasia Rybak, Michael Baker, Andrea Hills, Shahajahan Miyan, Peter Portmann, Nicole Rice, Robert Henry, Jeff J. Russell, B. H. Paynter, Linda Price, Brenda Shackley, Vicki Scanlan, Darshan Sharma, Christine Zaicou-Kunesch Feb 2009

Crop Updates 2009 - Cereals, Jeff Baldock, Doug Edmeades, Mark Seymour, Paul Carmody, Ian Pritchard, Alan Meldrum, Michael Robertson, Roger Lawes, Rob Sands, Peter White, Felicity Byrne, Andrew Bathgate, Kedar Adhikari, Tanveer Khan, Stuart Morgan, Alan Harris, P. Gaur, K. M. H. Siddique, H. Clarke, N. C. Turner, W. Macleod, S. Morgan, Chris Veitch, Tony Leonforte, Kith Jayasena, Geoff Thomas, Rob Loughman, Kazue Tanaka, Ravjit Khangura, M. Amjad, Richard Oliver, Dusty Severtson, Peter Mangano, John Botha, Brenda Coutts, Manisha Shankar, Kasia Rybak, Michael Baker, Andrea Hills, Shahajahan Miyan, Peter Portmann, Nicole Rice, Robert Henry, Jeff J. Russell, B. H. Paynter, Linda Price, Brenda Shackley, Vicki Scanlan, Darshan Sharma, Christine Zaicou-Kunesch

Crop Updates

This session covers twenty seven papers from different authors:

PLENARY

1. Building soil carbon for productivity and implications for carbon accounting, Jeff Baldock, CSIRO Land and Water, Adelaide, SA

2. Fact or Fiction: Who is telling the truth and how to tell the difference, Doug Edmeades, agKnowledge Ltd, Hamilton

3. Four decades of crop sequence trials in Western Australia, Mark Seymour,Department of Agriculture and Food

BREAK CROPS

4. 2008 Break Crops survey Report, Paul Carmody,Development Officer, Department of Agriculture and Food

5. Attitudes of Western Australian wheatbelt growers to ‘Break Crops’, Paul Carmody and Ian Pritchard, Development Officers ...


Crop Updates 2009 - Weeds, Catherine Borger, Abul Hasham, Mike Clarke, Ail Cheam, Harmohinder Dhammu, Vince Lambert, Chris Roberts, Russell Quartermaine, David Nicholson, Mike Jackson, Bill Campbell, John Moore, Mario D'Antuono, Paul Matson, Peter Newman, Sally Peltzer, Dave Minkey, Stephen B. Powels, Qin Yu, Mechelle Owen, Roberto Busi, Sudheesh Manalil, Leigh Smith, Peter White, Fions Evans, Pippa Michael, Siew Lee, Rob Grima, Glenn Adam, Trevor Bell, Steve Davies, Glen Riethmuller Feb 2009

Crop Updates 2009 - Weeds, Catherine Borger, Abul Hasham, Mike Clarke, Ail Cheam, Harmohinder Dhammu, Vince Lambert, Chris Roberts, Russell Quartermaine, David Nicholson, Mike Jackson, Bill Campbell, John Moore, Mario D'Antuono, Paul Matson, Peter Newman, Sally Peltzer, Dave Minkey, Stephen B. Powels, Qin Yu, Mechelle Owen, Roberto Busi, Sudheesh Manalil, Leigh Smith, Peter White, Fions Evans, Pippa Michael, Siew Lee, Rob Grima, Glenn Adam, Trevor Bell, Steve Davies, Glen Riethmuller

Crop Updates

This session covers twenty three papers from different authors:

Herbicides

1. New pre-seeding grass selective herbicides – How well do they work in zero or no-till systems? Dr Catherine Borgerand Dr Abul Hashem, Department of Agriculture and Food

2. Velocity®—An alternate mode of action for the control of wild radish in cereals, Mike Clarke, Bayer Cropscience Pty Ltd, Dr Aik Cheam, Department of Agriculture and Food, Dr Michael Walsh, WAHRI, University of Western Australia

3. Herbicide tolerance of new barley varieties, Harmohinder Dhammu, Vince Lambert, Chris Roberts and Russell Quartermaine, Department of Agriculture and Food

4. Herbicide tolerance of Desi ...


The Potential Role Of Sheep In Dryland Grain Production Systems, H. B. Goosey, P. G. Hatfield, Andrew W. Lenssen, Sue L. Blodgett, R. W. Kott Aug 2005

The Potential Role Of Sheep In Dryland Grain Production Systems, H. B. Goosey, P. G. Hatfield, Andrew W. Lenssen, Sue L. Blodgett, R. W. Kott

Andrew W. Lenssen

In dryland farming areas of Montana, annual precipitation is not sufficient for annual planting of cereal grains. Instead, a crop-summer fallow farming system is used to conserve soil moisture and increase available nitrogen for subsequent crop growth. Managing this summer fallow, either by mechanical means or with herbicides, is the highest variable cost associated with dryland grain production in Montana. Wheat stem sawfly, Cephus cinctus (Hymenoptera: Cephidae) is the most damaging insect pest to Montana’s US$ 1 billion per year grain industry. Weed management is the largest variable cost associated with dryland grain production and summer fallow management. Six ...


Crop Updates 2004 - Cereals, Wal Anderson, Vivian Vanstone, Robert Loughman, Vanessa Stewart, Darshan Sharma, Christine Zaicou-Kunesch, Brenda Shackley, Mohammad Amjad, Steve Penny Jr, Glen Riethmuller, Jeromy Lemon, Mario D'Antuono, Veronika Reck, Ben Curtis, Judith Devenish, Melaine Kupsch, Anne Smith, Blakely Paynter, Roslyn Jetter, Leanne Schulz, Jocelyn Ball, Tom Sweeny, Stephen Loss, Ashleigh Brooks, Justin Fuery, Geoff Anderson, Zed Rengel, Paul Damon, Eddy Pol, Narelle Hill, Ray Tugwell, Ron Mctaggart, Nathan Moyes, John Majewski, Manisha Shanker, James Piotrowski, Ciara Beard, Kithsiri Jayasena, Kazue Tanaka, Grey Poulish, Debbie Thackray, Rohan Prince, Roger Jones, Peter Nelson, Nigel Metz, Leisa Armstrong, Yee Leong (Alex) Yung, Moin Salam, David Tennant Feb 2004

Crop Updates 2004 - Cereals, Wal Anderson, Vivian Vanstone, Robert Loughman, Vanessa Stewart, Darshan Sharma, Christine Zaicou-Kunesch, Brenda Shackley, Mohammad Amjad, Steve Penny Jr, Glen Riethmuller, Jeromy Lemon, Mario D'Antuono, Veronika Reck, Ben Curtis, Judith Devenish, Melaine Kupsch, Anne Smith, Blakely Paynter, Roslyn Jetter, Leanne Schulz, Jocelyn Ball, Tom Sweeny, Stephen Loss, Ashleigh Brooks, Justin Fuery, Geoff Anderson, Zed Rengel, Paul Damon, Eddy Pol, Narelle Hill, Ray Tugwell, Ron Mctaggart, Nathan Moyes, John Majewski, Manisha Shanker, James Piotrowski, Ciara Beard, Kithsiri Jayasena, Kazue Tanaka, Grey Poulish, Debbie Thackray, Rohan Prince, Roger Jones, Peter Nelson, Nigel Metz, Leisa Armstrong, Yee Leong (Alex) Yung, Moin Salam, David Tennant

Crop Updates

This session covers twenty eight papers from different authors:

PLENARY

1. Declining profitability in continuous cropping systems. Is more wheat the answer on Duplex soil? Dr Wal Anderson, Department of Agriculture

2. Disease implications of extending the wheat phase in low-medium rainfall areas, Dr Vivian Vanstone and Dr Robert Loughman, Department of Agriculture

3. Prolonged wheat phase on duplex soils – where do weeds set the boundary? Vanessa Stewart, Department of Agriculture

WHEAT AGRONOMY

4. Management of small grain screenings in wheat, Dr Wal Anderson and Dr Darshan Sharma, Department of Agriculture

5. Agronomic responses of new wheat varieties, Christine Zaicou-Kunesch ...


Integrated Weed Management Plan For The Lower Las Vegas Wash, Elizabeth Bickmore Sep 2003

Integrated Weed Management Plan For The Lower Las Vegas Wash, Elizabeth Bickmore

Publications (WR)

The Las Vegas Wash (Wash) is the primary drainage for the metropolitan Las Vegas Valley, eventually finding its way into the Colorado River watershed system. Pursuant to the recommendations of the Water Quality Citizens Advisory Committee, the Las Vegas Wash Coordination Committee (LVWCC) was formed in 1998 to develop a comprehensive plan for the long-term stabilization and management of the Wash. Consisting of representatives from 28 government agencies, businesses, environmental groups and citizens, the LVWCC formulated the Las Vegas Wash Comprehensive Adaptive Management Plan (CAMP) and designated the Southern Nevada Water Authority (SNWA) as the lead agency for the implementation ...


Crop Updates 2002 - Weeds, Vanessa Stewart, Alexander Douglas, Peter Newman, Glen Adams, Andrew Blake, Natalie Lauritsen, Sally Peltzer, Paul Matson, Abul Hasham, Nerys Wilkins, David Minkey, Glen Riethmuller, Tim Cusack, Kathryn Steadman, Pippa Michael, Paul Blackwell, Dave Brindal, Glen Adam, Michael Walsh, Wayne Parker, Clinton Revell, Giles Glasson, Dean Thomas, Alister Draper, Bill Roy, Marta Monjardin, David Pannell, Stephen Powles, Robert Barrett-Lennard, Martin Bent, Paul Neve, Art Diggle, Patrick Smith, Mechelle Owen, Abul Hashem, Christopher Preston, Tracey Gillam, Rick Llewellyn, Richard Quinlan, Aik Cheam, Siew Lee, Mike Clarke, David Nicholson, Harmoohinder S. Dhammu, Terry Piper, Chad Sayer, Ian Rose, Andrew Blake, Jerome Critch, Gordon R. Cumming, Sam Taylor, John Moore, Rosyln Jettner, Stuart Bee, Lionel Martin, Keith Devenish, Felicity Flugge, Amir Abadi, Duncan Peter, Stuart Mcalpine Feb 2002

Crop Updates 2002 - Weeds, Vanessa Stewart, Alexander Douglas, Peter Newman, Glen Adams, Andrew Blake, Natalie Lauritsen, Sally Peltzer, Paul Matson, Abul Hasham, Nerys Wilkins, David Minkey, Glen Riethmuller, Tim Cusack, Kathryn Steadman, Pippa Michael, Paul Blackwell, Dave Brindal, Glen Adam, Michael Walsh, Wayne Parker, Clinton Revell, Giles Glasson, Dean Thomas, Alister Draper, Bill Roy, Marta Monjardin, David Pannell, Stephen Powles, Robert Barrett-Lennard, Martin Bent, Paul Neve, Art Diggle, Patrick Smith, Mechelle Owen, Abul Hashem, Christopher Preston, Tracey Gillam, Rick Llewellyn, Richard Quinlan, Aik Cheam, Siew Lee, Mike Clarke, David Nicholson, Harmoohinder S. Dhammu, Terry Piper, Chad Sayer, Ian Rose, Andrew Blake, Jerome Critch, Gordon R. Cumming, Sam Taylor, John Moore, Rosyln Jettner, Stuart Bee, Lionel Martin, Keith Devenish, Felicity Flugge, Amir Abadi, Duncan Peter, Stuart Mcalpine

Crop Updates

This session covers fifty eight papers from different authors:

1. INTRODUCTION Vanessa Stewart, DEPARTMENT OF AGRICULTURE

INTEGRATED WEED MANAGEMENT

IWM system studies / demonstration sites

2. Major outcomes from IWM demonstration sites, Alexandra Douglas Department of Agriculture

3. Integrated weed management: Katanning, Alexandra Douglas Department of Agriculture

4. Integrated weed management: Merredin, Vanessa Stewart Department of Agriculture

5. Long term resistance site: Get ryegrass numbers low and keep them low! Peter Newman and Glen Adams Department of Agriculture

6. Using pastures to manage ryegrass populations, Andrew Blake and Natalie Lauritsen Department of Agriculture

Weed biology and competition

7. Understanding the weed ...


Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson Feb 2001

Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson

Crop Updates

This session covers twenty six papers from different authors:

INTRODUCTION,

1. Introduction, Dr Mark Sweetingham LUPIN RESEARCH AND INDUSTRY DEVELOPMENT, Agriculture Western Australia

VARIETIES

2. Lupin variety performance: Are you making the most of it? Bevan J. Buirchell, Agriculture Western Australia

3. Adaption of restricted-branching lupins in Western Australia, Bob French and Laurie Wahlsten, Agriculture Western Australia

4. Isolated microspore culture of lupin for production of doubled haploids, Dr Janet Wroth, Dr Kirsty Bayliss and A/Prof. Wallace Cowling, Plant Sciences, Faculty of Agriculture, The University of Western Australia

NUTRITION

5. Banding manganese fertiliser below the seed increases seed yields ...


Crop Updates 2000 Cereals - Part 3, Roslyn Jettner, Blakely Paynter, Glen Mcdonald, Pierre Fievez, Ian Foster, David Tennant, Wal Anderson, James Ridsdill-Smith, Celia Pavri, Ross Chapman, Senthold Asseng, Steve Carr, Brad Nutt, Lindrea Latham, Roger Jones, Anyou Liu, Clinton Revell, David Ferris, Roy Latta, Lisa-Jane Blacklow, Chris Matthews, Ted Woodburn, Paul Yeoh, Ian Rose, Anita Lyons, Simon Cook, Matthew L. Adams, Robert J. Corner Feb 2000

Crop Updates 2000 Cereals - Part 3, Roslyn Jettner, Blakely Paynter, Glen Mcdonald, Pierre Fievez, Ian Foster, David Tennant, Wal Anderson, James Ridsdill-Smith, Celia Pavri, Ross Chapman, Senthold Asseng, Steve Carr, Brad Nutt, Lindrea Latham, Roger Jones, Anyou Liu, Clinton Revell, David Ferris, Roy Latta, Lisa-Jane Blacklow, Chris Matthews, Ted Woodburn, Paul Yeoh, Ian Rose, Anita Lyons, Simon Cook, Matthew L. Adams, Robert J. Corner

Crop Updates

This session covers eighteen papers from different authors:

BARLEY AND OAT AGRONOMY

1. Unicorn barley must meet malting specifications to be a viable option, Roslyn Jettnerand Blakely Paynter, Agriculture Western Australia

2. Optimum oat seed rates, Glenn McDonald, Agriculture Western Australia

3. Production and Quality of export Oaten Hay (1998 and 1989), Pierre Fievez, Pierre Fievez and Associates

FROST

4. Climatology of Frost in Southern Western Australia, Ian Foster, Agriculture Western Australia

5. Flowering calculator, David Tennant, Agriculture Western Australia

6. Some options for managing the risk of frost damage, Wal Anderson, Agriculture Western Australia

PASTURE

7. TIMERITE® Control of ...


Crop Updates 2000 - Weeds, Vanessa Stewart, David Minkey, Abul Hashem, Glen Riethmuller, Martin Harries, Peter Newman, Cameron Weeks, Harmohinder S. Dhammu, Aik Cheam, David Bowran, Terry Piper, Alexandra Wallace, Bill Roy, Keith L. Devenish, Lisa J. Leaver, Brad Rayner, Mike Collins, Marta Monardino, David Pannell, Stephen Powles, Sally Peltzer, Michael Walsh, Charles Boyle, P. Neve, D. Lorraine-Colwill, C. Preston, Art Diggle, Rick Llewellyn, Ryan Duane, Siew Lee, David Nicholson, Peter Carlton, Stewart Smith, Bill Crabtree, Gordon Cumming, David Cameron, Mike Jackson, Scott Paton, John R. Peirce, Greg Shea Feb 2000

Crop Updates 2000 - Weeds, Vanessa Stewart, David Minkey, Abul Hashem, Glen Riethmuller, Martin Harries, Peter Newman, Cameron Weeks, Harmohinder S. Dhammu, Aik Cheam, David Bowran, Terry Piper, Alexandra Wallace, Bill Roy, Keith L. Devenish, Lisa J. Leaver, Brad Rayner, Mike Collins, Marta Monardino, David Pannell, Stephen Powles, Sally Peltzer, Michael Walsh, Charles Boyle, P. Neve, D. Lorraine-Colwill, C. Preston, Art Diggle, Rick Llewellyn, Ryan Duane, Siew Lee, David Nicholson, Peter Carlton, Stewart Smith, Bill Crabtree, Gordon Cumming, David Cameron, Mike Jackson, Scott Paton, John R. Peirce, Greg Shea

Crop Updates

This session covers thirty six papers from different authors:

INTRODUCTION, Vanessa Stewart Agriculture Western Australia

INTEGRATED WEED MANAGEMENT

  1. Effect of seeding density, row spacing and Trifluralin on the competitive ability of Annual Ryegrass in a minimum tillage system, David Minkey, Abul Hashem, Glen Riethmuller and Martin Harries, Agriculture Western Australia

  2. High wheat seeding rates coupled with narrow row spacing increases yield and suppresses grass, Peter Newman1 and Cameron Weeks2,1Agronomist, Elders Limited 2Mingenew/Irwin Group

  3. Resistant ryegrass management in a wheat – lupin rotation, Abul Hashem, Harmohinder S. Dhammu, Aik Cheam, David Bowran and Terry Piper, Agriculture ...


Weeds Can Poison Crops, Aik Hock Cheam Jan 1996

Weeds Can Poison Crops, Aik Hock Cheam

Journal of the Department of Agriculture, Western Australia, Series 4

Weeds can interfere with the growth of a crop simply by competing with the crop for nutrients, moisture and light. But some weeds also release chemicals that inhibit the germination and growth of crop plants; the technical term for this is allelopathy. Aik Cheam outlines the problems caused by two common weeds and the discusses preventative measures.


Maine's Endangered And Threatened Plants, Maine State Planning Office Jan 1990

Maine's Endangered And Threatened Plants, Maine State Planning Office

Maine Collection

Maine's Endangered and Threatened Plants

Executive Department, Maine State Planning Office, Critical Areas Program, 1990.


Noteworthy Collections: Virginia, W. John Hayden Sep 1989

Noteworthy Collections: Virginia, W. John Hayden

Biology Faculty Publications

The above collections represent the second record for the state of Virginia, and may well establish the northernmost station for the species in the eastern United States. According to B.L. Lipscomb (Sida 8:320-327. 1980), this Old World weed is spreading throughout the warmer regions of North America. The only previous record of the species from the state is a Fernald specimen from Owl Creek in Virginia Beach. R.W. Tyndall, who found the species in northeastern North Carolina, was unable in 1978 to locate the plant at Fernald's Virginia Beach locality (Castanea 48:277-280. 1983). The Amelia ...


Research On Declared Plants And Other Weeds, G. A. Pearce Jan 1984

Research On Declared Plants And Other Weeds, G. A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

Knowledge about weeds is necessary to assess their significance, devise control measures and to select those which are to be declared for the purposes of the Agricultural and Related Resources Protection Act.

Once a plant has been declared in Western Australia, all landowners must control and prevent its spread to new areas and work towards eradicating known infestations. The Act also declares plants which are prohibited from entering the State.

It is becoming more and more important to provide specific reasons for the declaration of a weed and its placement in a certain category. Such decisions require appropriate action to ...


Rare Vascular Plants Of Maine : A Critical Areas Program Report, Susan C. Gawler, L. M. Eastman Jun 1981

Rare Vascular Plants Of Maine : A Critical Areas Program Report, Susan C. Gawler, L. M. Eastman

Maine Collection

Rare Vascular Plants of Maine : A Critical Areas Program Report

Based on Rare Vascular Maine Plants (1978) with Additional Herbarium Data and Rare Plants Information by L.M. Eastman.

Introduction, Criteria, Annotated Rare Plant List, Species Accounts, Additional Herbarium Data, County & Town Index Editing by Susan C. Gawler.

Executive Department, State Planning Office, 189 State Street, Augusta, Maine, 04333 (June 1981).

Contents: Acknowledgements / List of Tables / List of Figures / Part One: Introduction / Part Two: List of the Rare Vascular Plants of Maine / Part Three: Species Accounts / Part Four: Subspecific Taxa / Appendices / Bibliography / Index by County and Town / Index to Families ...


Faster Weed Germination With Early Cultivation, Geoffrey A. Pearce Jan 1973

Faster Weed Germination With Early Cultivation, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

The key to cultural control of weeds in cereal crops is an understanding of the factors which govern germination of the weed seeds.

Covering the seed with soil keeps out light, provides a stable moisture supply and makes germination faster than if the seed is left on the soil surface.

Shallow cultivation at the start of the growing season provides the soil cover needed for fast, even germination of weed seeds.


Annual Pasture And Weed Plant Ecology, B J. Quinlivan Jan 1972

Annual Pasture And Weed Plant Ecology, B J. Quinlivan

Journal of the Department of Agriculture, Western Australia, Series 4

The purpose of this article is to outline a few basic principles of pasture and weed ecology with particular reference to seed dormancy mechanisms.

These principles apply to many pasture plants and weeds, although their relative importance varies with the particular plants under study.


Cotton Bush (Asclepias Fruticosa L.) : Garden Plant Now A Noxious Weed, G R W Meadly Jan 1971

Cotton Bush (Asclepias Fruticosa L.) : Garden Plant Now A Noxious Weed, G R W Meadly

Journal of the Department of Agriculture, Western Australia, Series 4

THE cotton bush is native to South Africa but is now naturalised in most tropical and sub-tropical countries of the world. Its spread is, in no small measure, due to being grown frequently as a garden subject.


Calotropis Or Rubber Tree (Calctropis Procera (Linn.) Dryand), G R W Meadly Jan 1971

Calotropis Or Rubber Tree (Calctropis Procera (Linn.) Dryand), G R W Meadly

Journal of the Department of Agriculture, Western Australia, Series 4

TWO SPECIES of Calotropis have been introduced to the northern parts of Western Australia. They are closely related in most respects but differ in one fundamental feature which decides their significance as undesirable plants.


The Control Of Doublegee, Geoffrey A. Pearce Jan 1967

The Control Of Doublegee, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

FOUR years ago no practical recommendations could be made for the control of doublegee.

With money provided by the State Wheat Research Fund, research has been undertaken into the control of this weed, and there is now no reason why most farmers cannot bring doublegee under control.


Co2:O2 Ratios In Relation To Weed Seed Germination , Gary Donnell Sells Jan 1965

Co2:O2 Ratios In Relation To Weed Seed Germination , Gary Donnell Sells

Retrospective Theses and Dissertations

No abstract provided.


Weeds In Lawns. 1. Identification Of Weeds In Lawns, Robert Dunlop Royce Jan 1963

Weeds In Lawns. 1. Identification Of Weeds In Lawns, Robert Dunlop Royce

Journal of the Department of Agriculture, Western Australia, Series 4

ACCURATE identification of weeds is the first principal of weed control with modern chemicals.

This is as true for weeds in lawns as any other weeds.


Special Seeds Help Weeds To Spread, Robert Dunlop Royce Jan 1962

Special Seeds Help Weeds To Spread, Robert Dunlop Royce

Journal of the Department of Agriculture, Western Australia, Series 4

PERHAPS the most important characteristic of a plant which establishes it as a weed is that it serves no useful purpose under the circumstances in which it occurs.


Cotton Fireweed : A Native Weed Menace, G R W Meadly Jan 1961

Cotton Fireweed : A Native Weed Menace, G R W Meadly

Journal of the Department of Agriculture, Western Australia, Series 4

INTRODUCED plants have provided most of our weed problems. Cape tulip, double gee and soursob come from South Africa, Saffron thistle, Paterson's curse, wild turnip and wild radish from Europe, mesquite from the southern United States and Bathurst burr from South America.

The relatively few native plants which have become troublesome weeds include Afghan thistle and Sarsaparilla.


Factors In Weed Propagation, G R W Meadly Jan 1961

Factors In Weed Propagation, G R W Meadly

Journal of the Department of Agriculture, Western Australia, Series 4

I N crop and pasture plants, seed production and harvesting are of vital impartance.

In a negative way, the formation of seeds by weeds can be equally important.


Afghan Thistle (Solanum Hystrix R. Br.), G R W Meadly Jan 1960

Afghan Thistle (Solanum Hystrix R. Br.), G R W Meadly

Journal of the Department of Agriculture, Western Australia, Series 4

DURING the summer months it is usual to receive many specimens of a prickly plant with blue flowers similar to those of a potato. It is commonly known as Afghan Thistle or Prickly Potato Weed.

This plant is not a thistle, although it has the prickly foliage characteristic of many members of that group. The botanical name is Solanum hystrix which places it in the same family as the tomato, potato and tobacco.

Relatives also include weeds such as the thornapples, black nightshade and apple of Sodom.

The name Prickly Potato Weed, although somewhat unwieldy is therefore more appropriate than ...


Transpiration As A Factor In Crop Production, T. A. Kiesselbach Jun 1916

Transpiration As A Factor In Crop Production, T. A. Kiesselbach

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

The object of experiments reported in this bulletin has been to determine principles according to which water is used by crops. In many agricultural districts, water is frequently a seriously limiting factor in crop production. It has been thought that some means might be devised through a correct understanding of the principles involved, whereby economy in the use of water in farm practice could be increased. In this effort there are two chief points of attack, namely, (1) adjusting the external factors to the needs of the plant, and (2) selecting plants adapted to the conditions.