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Evaluation of Corn (Zea mays L.) Yield-loss Estimations by WeedSOFT® in the North Central Region
- Andrew A. Schmidt, William G. Johnson, David A. Mortensen, Alex R. Martin, Anita Dille, Dallas E. Peterson, Corey Guza, James J. Kells, Ryan D. Lins, Chris M. Boerboom, Christy L. Sprague, Stevan Z. Knezevic, Fred W. Roeth, Case R. Medlin, Thomas T. Bauman
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- Journal:
- Weed Technology / Volume 19 / Issue 4 / December 2005
- Published online by Cambridge University Press:
- 20 January 2017, pp. 1056-1064
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- Article
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Field studies were conducted in 2000 and 2001 to evaluate corn yield-loss predictions generated by WeedSOFT, a computerized weed management decision aid. Conventional tillage practices were used to produce corn in 76-cm rows in Illinois, Indiana, Kansas, Michigan, Missouri, Nebraska, and Wisconsin. A total of 21 site-years from these seven states were evaluated in this study. At 4 wk after planting, weed densities and size, crop-growth stage, estimated weed-free yield, and environmental conditions at the time of application were entered into WeedSOFT to generate POST treatments ranked by percent maximum yield (PMY). POST treatments were chosen with yield losses ranging from 0 to 20%. Data were subjected to linear regression analysis by state and pooled over all states to determine the relationship between actual and predicted yield loss. A slope value equal to one implies perfect agreement between actual and predicted yield loss. Slope value estimates for Illinois and Missouri were equal to one. Actual yield losses were higher than the software predicted in Kansas and lower than predicted in Michigan, Nebraska, and Wisconsin. Slope value estimate from a data set containing all site years was equal to one. This research demonstrated that variability in yield-loss predictions occurred at sites that contained a high density of a single weed specie (>100/m2) regardless of its competitive index (CI); at sites with a predominant broadleaf weed with a CI greater than five, such as Palmer amaranth, giant ragweed, common sunflower, and common cocklebur; and at sites that experience moderate to severe drought stress.
Contributors
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- By Tod C. Aeby, Melanie D. Altizer, Ronan A. Bakker, Meghann E. Batten, Anita K. Blanchard, Brian Bond, Megan A. Brady, Saweda A. Bright, Ellen L. Brock, Amy Brown, Ashley Carroll, Jori S. Carter, Frances Casey, Weldon Chafe, David Chelmow, Jessica M. Ciaburri, Stephen A. Cohen, Adrianne M. Colton, PonJola Coney, Jennifer A. Cross, Julie Zemaitis DeCesare, Layson L. Denney, Megan L. Evans, Nicole S. Fanning, Tanaz R. Ferzandi, Katie P. Friday, Nancy D. Gaba, Rajiv B. Gala, Andrew Galffy, Adrienne L. Gentry, Edward J. Gill, Philippe Girerd, Meredith Gray, Amy Hempel, Audra Jolyn Hill, Chris J. Hong, Kathryn A. Houston, Patricia S. Huguelet, Warner K. Huh, Jordan Hylton, Christine R. Isaacs, Alison F. Jacoby, Isaiah M. Johnson, Nicole W. Karjane, Emily E. Landers, Susan M. Lanni, Eduardo Lara-Torre, Lee A. Learman, Nikola Alexander Letham, Rachel K. Love, Richard Scott Lucidi, Elisabeth McGaw, Kimberly Woods McMorrow, Christopher A. Manipula, Kirk J. Matthews, Michelle Meglin, Megan Metcalf, Sarah H. Milton, Gaby Moawad, Christopher Morosky, Lindsay H. Morrell, Elizabeth L. Munter, Erin L. Murata, Amanda B. Murchison, Nguyet A. Nguyen, Nan G. O’Connell, Tony Ogburn, K. Nathan Parthasarathy, Thomas C. Peng, Ashley Peterson, Sarah Peterson, John G. Pierce, Amber Price, Heidi J. Purcell, Ronald M. Ramus, Nicole Calloway Rankins, Fidelma B. Rigby, Amanda H. Ritter, Barbara L. Robinson, Danielle Roncari, Lisa Rubinsak, Jennifer Salcedo, Mary T. Sale, Peter F. Schnatz, John W. Seeds, Kathryn Shaia, Karen Shelton, Megan M. Shine, Haller J. Smith, Roger P. Smith, Nancy A. Sokkary, Reni A. Soon, Aparna Sridhar, Lilja Stefansson, Laurie S. Swaim, Chemen M. Tate, Hong-Thao Thieu, Meredith S. Thomas, L. Chesney Thompson, Tiffany Tonismae, Angela M. Tran, Breanna Walker, Alan G. Waxman, C. Nathan Webb, Valerie L. Williams, Sarah B. Wilson, Elizabeth M. Yoselevsky, Amy E. Young
- Edited by David Chelmow, Virginia Commonwealth University, Christine R. Isaacs, Virginia Commonwealth University, Ashley Carroll, Virginia Commonwealth University
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- Book:
- Acute Care and Emergency Gynecology
- Published online:
- 05 November 2014
- Print publication:
- 30 October 2014, pp ix-xiv
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- By Lenard A. Adler, Pinky Agarwal, Rehan Ahmed, Jagga Rao Alluri, Fawaz Al-Mufti, Samuel Alperin, Michael Amoashiy, Michael Andary, David J. Anschel, Padmaja Aradhya, Vandana Aspen, Esther Baldinger, Jee Bang, George D. Baquis, John J. Barry, Jason J. S. Barton, Julius Bazan, Amanda R. Bedford, Marlene Behrmann, Lourdes Bello-Espinosa, Ajay Berdia, Alan R. Berger, Mark Beyer, Don C. Bienfang, Kevin M. Biglan, Thomas M. Boes, Paul W. Brazis, Jonathan L. Brisman, Jeffrey A. Brown, Scott E. Brown, Ryan R. Byrne, Rina Caprarella, Casey A. Chamberlain, Wan-Tsu W. Chang, Grace M. Charles, Jasvinder Chawla, David Clark, Todd J. Cohen, Joe Colombo, Howard Crystal, Vladimir Dadashev, Sarita B. Dave, Jean Robert Desrouleaux, Richard L. Doty, Robert Duarte, Jeffrey S. Durmer, Christyn M. Edmundson, Eric R. Eggenberger, Steven Ender, Noam Epstein, Alberto J. Espay, Alan B. Ettinger, Niloofar (Nelly) Faghani, Amtul Farheen, Edward Firouztale, Rod Foroozan, Anne L. Foundas, David Elliot Friedman, Deborah I. Friedman, Steven J. Frucht, Oded Gerber, Tal Gilboa, Martin Gizzi, Teneille G. Gofton, Louis J. Goodrich, Malcolm H. Gottesman, Varda Gross-Tsur, Deepak Grover, David A. Gudis, John J. Halperin, Maxim D. Hammer, Andrew R. Harrison, L. Anne Hayman, Galen V. Henderson, Steven Herskovitz, Caitlin Hoffman, Laryssa A. Huryn, Andres M. Kanner, Gary P. Kaplan, Bashar Katirji, Kenneth R. Kaufman, Annie Killoran, Nina Kirz, Gad E. Klein, Danielle G. Koby, Christopher P. Kogut, W. Curt LaFrance, Patrick J.M. Lavin, Susan W. Law, James L. Levenson, Richard B. Lipton, Glenn Lopate, Daniel J. Luciano, Reema Maindiratta, Robert M. Mallery, Georgios Manousakis, Alan Mazurek, Luis J. Mejico, Dragana Micic, Ali Mokhtarzadeh, Walter J. Molofsky, Heather E. Moss, Mark L. Moster, Manpreet Multani, Siddhartha Nadkarni, George C. Newman, Rolla Nuoman, Paul A. Nyquist, Gaia Donata Oggioni, Odi Oguh, Denis Ostrovskiy, Kristina Y. Pao, Juwen Park, Anastas F. Pass, Victoria S. Pelak, Jeffrey Peterson, John Pile-Spellman, Misha L. Pless, Gregory M. Pontone, Aparna M. Prabhu, Michael T. Pulley, Philip Ragone, Prajwal Rajappa, Venkat Ramani, Sindhu Ramchandren, Ritesh A. Ramdhani, Ramses Ribot, Heidi D. Riney, Diana Rojas-Soto, Michael Ronthal, Daniel M. Rosenbaum, David B. Rosenfield, Durga Roy, Michael J. Ruckenstein, Max C. Rudansky, Eva Sahay, Friedhelm Sandbrink, Jade S. Schiffman, Angela Scicutella, Maroun T. Semaan, Robert C. Sergott, Aashit K. Shah, David M. Shaw, Amit M. Shelat, Claire A. Sheldon, Anant M. Shenoy, Yelizaveta Sher, Jessica A. Shields, Tanya Simuni, Rajpaul Singh, Eric E. Smouha, David Solomon, Mehri Songhorian, Steven A. Sparr, Egilius L. H. Spierings, Eve G. Spratt, Beth Stein, S.H. Subramony, Rosa Ana Tang, Cara Tannenbaum, Hakan Tekeli, Amanda J. Thompson, Michael J. Thorpy, Matthew J. Thurtell, Pedro J. Torrico, Ira M. Turner, Scott Uretsky, Ruth H. Walker, Deborah M. Weisbrot, Michael A. Williams, Jacques Winter, Randall J. Wright, Jay Elliot Yasen, Shicong Ye, G. Bryan Young, Huiying Yu, Ryan J. Zehnder
- Edited by Alan B. Ettinger, Albert Einstein College of Medicine, New York, Deborah M. Weisbrot, State University of New York, Stony Brook
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- Book:
- Neurologic Differential Diagnosis
- Published online:
- 05 June 2014
- Print publication:
- 17 April 2014, pp xi-xx
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- By Elizabeth Baker Brite, Gwen P. Bennett, Victor Buchli, Claudia Chang, Geoff Emberling, Alan F. Greene, Charles W. Hartley, MaryFran Heinsch, Fiona Kidd, Philip L. Kohl, Hu Lin, Katheryn M. Linduff, Maureen E. Marshall, Belinda H. Monahan, Eileen M. Murphy, Michelle Negus Cleary, David L. Peterson, Irina Lita Shingiray, Victor A. Shnirelman, Adam T. Smith, Joanna Sofaer, Wu Xin, Yang Jianhua, G. Bike Yazıcıoğlu
- Edited by Charles W. Hartley, University of Chicago, G. Bike Yazicioğlu, University of Chicago, Adam T. Smith, Cornell University, New York
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- Book:
- The Archaeology of Power and Politics in Eurasia
- Published online:
- 05 December 2012
- Print publication:
- 19 November 2012, pp xiii-xviii
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Notes on contributors
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- By Christine Alexander, Simon Avery, Michael Baumber, Birgitta Berglund, Dinah Birch, Miriam Elizabeth Burstein, Janis McLarren Caldwell, Edward Chitham, Stephen Colclough, Ann Dinsdale, Bob Duckett, Maria Frawley, Barbara T. Gates, Janet Gezari, Dudley Green, David Jasper, Drew Lamonica Arms, Elizabeth Langland, Alexandra Lewis, Sara J. Lodge, Sue Lonoff, Jill L. Matus, Victor A. Neufeldt, Linda H. Peterson, Stephen Prickett, Lyn Pykett, Herbert Rosengarten, Jane Sellars, Joanne Shattock, Margaret Smith, Patsy Stoneman, Marianne Thormählen, Ian Ward, Stephen Whitehead, T. J. Winnifrith, Steven Wood
- Edited by Marianne Thormählen, Lunds Universitet, Sweden
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- Book:
- The Brontës in Context
- Published online:
- 05 December 2012
- Print publication:
- 01 November 2012, pp xi-xvii
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- By Kateri Berasi, Carol A. Boyer, Diane R. Brown, Robyn Lewis Brown, Tony N. Brown, Padraic J. Burns, Cleopatra Howard Caldwell, Daniel L. Carlson, Cheryl Corcoran, Manuela Costa, Stephen Crystal, Gary S. Cuddeback, William W. Eaton, Adrianne Frech, Virginia Aldigé Hiday, Stevan E. Hobfoll, Allan V. Horwitz, Robert J. Johnson, Verna M. Keith, Ronald C. Kessler, Corey L. M. Keyes, Jacinta P. Leavell, Harriet P. Lefley, Mary Clare Lennon, Laura Limonic, Bruce G. Link, Athena McLean, David Mechanic, Elizabeth G. Menaghan, Barret Michalec, John Mirowsky, Shirin Montazer, Joseph P. Morrissey, Carles Muntaner, Bernice A. Pescosolido, Christopher Peterson, Jo C. Phelan, Michael Polgar, Sarah Rosenfield, Catherine E. Ross, Ebony Sandusky, Jaime C. Sapag, Teresa L. Scheid, Mark F. Schmitz, Sharon Schwartz, Dena Smith, David T. Takeuchi, Peggy A. Thoits, R. Jay Turner, Edwina S. Uehara, Jerome C. Wakefield, James Walkup, Emily Walton, Blair Wheaton, David R. Williams, Kristi Williams
- Edited by Teresa L. Scheid, University of North Carolina, Charlotte, Tony N. Brown, Vanderbilt University, Tennessee
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- Book:
- A Handbook for the Study of Mental Health
- Published online:
- 05 June 2012
- Print publication:
- 16 November 2009, pp xi-xiv
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A Counting Method for Measuring Single Crystal Diffraction Intensities Using a Weissenberg Camera
- David T. Peterson, C. L. Vold
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- Journal:
- Advances in X-ray Analysis / Volume 1 / 1957
- Published online by Cambridge University Press:
- 06 March 2019, pp. 181-192
- Print publication:
- 1957
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The North American Philips G-M Counting Attachment for use with a Weissenberg camera was modified to achieve greater accuracy and speed in measuring integrated diffraction intensities. The shape, size and divergence of the primary beam was changed to obtain a larger and more reproducible number of counts. The oscillating mechanism was simplified and made more convenient. The receiving slit was enlarged so as to yield integrated intensities which were not affected by the diffraction peak shape. The accuracy and precision of the apparatus was determined by measuring the intensities of equivalent reflections from an ideally shaped crystal of nickel dimethyl glyoxime and by measuring the diffraction intensities from a parameterless structure such as sodium chloride. Very few calculation's are necessary in order to make the proper instrument settings as the necessary angles are read directly from a Weissenberg diffraction pattern.