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Dr.
Robert L. Nielsen
Professor of Agronomy
Extension Corn Specialist
915 W. State Street
Department of Agronomy
Purdue University
West Lafayette, Indiana 47907-2054
My Responsibilities at Purdue University
Extension education in corn management systems.
- Transgenic crop issues
![Ears of corn](pix/corn_ears_right_face.gif)
- Corn growth and development
- Understanding the effects of stress on corn
- Stand establishment issues in corn
- Corn replant decision-making
- Yield-limiting factors in corn production
- Crop problem troubleshooting
- Site-specific crop management technologies
- Working with yield monitor data
- Technology transfer & distance education via the World Wide Web
- Managing the downside risks of continuous corn
- Guidelines for on-farm research
- Managing nitrogen fertilizer for corn
- Profitable corn management practices
Extension Publications
Publications
marked with the symbol
require the Adobe
Reader plugin.
Publications that are not available online may be ordered through Purdue's
Media Distribution Center.
- I've also written a fair number of Extension newsletter articles over
the years. Many of them that have been written since the dawn of prehistoric
[Web] time are archived in my Corny
News Network Archives.
Research interests in corn management systems.
- Effects of Uneven Plant Spacing on Corn Grain Yield (2004 - 2006)
- Fine-Tuning Purdue’s N Rate Recommendations for Corn (2006 - )
- Potential for Using Optical Sensors for Fine-Tuning N Rate Recommendations
in Corn (2006 - )
- Managing Corn Residues in No-till Continuous Corn (2008 - )
- Nitrogen Use Comparisons Between Bt and non-Bt Corn Hybrids (2008
- )
A Fun Extension Project:
![Take a look at our 5-ac corn maze!](pix/BoilerMazer2001.gif)
Downloadable Powerpoint Presentations
- Available Powerpoint® Presentations
for PUCES Ag. Educators
- The links on this page are intended for the exclusive use of Purdue
University Cooperative Extension Service (PUCES) staff for their conduct
of educational programs for the citizens of Indiana. Non-PUCES visitors
to this page who desire to use these presentations for their own purposes
should request permission to do so from the respective authors.
Presentations, Papers, etc.
I
have begun to convert my online Powerpoint® presentations to Adobe®
Flash® versions that should be less memory-intensive to download and
play. They require Adobe's Flash Player which is a standard add-on to
most of today's Web browsers. If you need to download and install the
Flash Player, go to the Adobe download site at http://get.adobe.com/flashplayer.
- Optical
Reflectance Sensors & N Rate Decisons for Corn
![](pix/flashplayer.png)
- This presentation highlights our research with optical reflectance
sensors and their potential for helping fine-tune nitrogen rate decisions
for corn.
- R.L. (Bob) Nielsen and Jim Camberato
- © 2008-2009, Purdue Univ.
- Corn
Growth & Development: Stand Establishment
![](pix/flashplayer.png)
- This presentation describes the stand establishment period from germination
through about leaf stage V6 and the effects that stress can impose on
this critical period.
- R.L. (Bob) Nielsen
- © 2008-2009, Purdue Univ.
- Corn
Growth & Development: Rapid Growth Phase
![](pix/flashplayer.png)
- This presentation addresses the rapid growth phase that begins shortly
after leaf stage V6 and continues until pollination and the effects
that stress can impose during this critical period. The presentation
includes a description of the ear size determination process. The influence
of row spacing and seeding rates are also discussed.
- R.L. (Bob) Nielsen
- © 2008-2009, Purdue Univ.
- Mitigate
the Downside Risks of Second-Year Corn
![](pix/flashplayer.png)
- Agronomically, a continuous corn cropping system is fraught with a
multitude of negative yield influencing factors. Most growers understand
this, yet sometimes they believe crop economics favor growing continuous
corn. While most agronomists certainly do not encourage monoculture
of any kind, one can at least offer suggestions for mitigating the downside
risks of corn following corn for those growers who feel pressured to
do so. A written summary (PDF format) is available HERE.
- R.L. (Bob) Nielsen
- © 2005-2009, Purdue Univ.
- Corn Planter Tuneups: Why Bother?
- Online Powerpoint presentation
(Req. IE v5.0 or newer)
Powerpoint® 2002 version (10.8
MB)
Adobe PDF version (Presentation view)
(2.2 MB)
Adobe PDF version (Handout view)
(1.6 MB)
- A presentation on the importance of uniform plant-to-plant spacing
and emergence in corn, plus guidelines on improving planter performance..
- © 2002-2004, Purdue University.
- Stand Establishment Issues & Concerns for No-Till Corn
- Powerpoint®
2000 version (19.1 MB)
Adobe PDF version
(Presentation view) (3.5 MB)
Adobe PDF version
(Handout view) (1.7 MB)
- This presentation discusses the issues and challenges of achieving
successfull stand establishment in no-till corn. Suggested agronomic
decisions for improving stand establishment are described.
- © 2003, Purdue University.
- Protecting Your Non-GMO Grain From Contamination
- Powerpoint®
2000 version (4.0 MB)
Adobe PDF version
(Presentation view) (2.1 MB)
Adobe PDF version
(Handout view) (1.8 MB)
- Certain transgenic corn traits available to U.S. corn growers are
not yet fully approved in the global marketplace, especially by the
European Union. Consequently, certain U.S. grain buyers restrict their
purchases to that from only approved hybrids and reject grain from non-approved
hybrids or grain from fields of approved hybrids that is "contaminated"
with transgenic grain. This so-called "contamination" can occur from
mechanical mixing (commingling) of grain from different hybrids during
planting, harvesting, or post-harvest operations. Pollen drift from
transgenic hybrids can also cause "contamination" of neighboring fields
due to cross-pollination. Consequently, growers who desire to maintain
the non-transgenic purity of the grain in their production fields need
to understand corn pollen biology, the dynamics of pollen drift, and
possible methodologies for minimizing the risk of significant pollen
"contamination" from adjacent fields of non-approved corn hybrids.
- © 2003, Purdue University.
- Using On-Farm Research: Are Those Real Differences I'm
Seeing?
- Powerpoint® 2000 version
(7.5 MB)
Adobe PDF version (Presentation view)
(2.5 MB)
Adobe PDF version (Handout view)
(1.0 MB)
- The purpose of this presentation is to help growers and consultants
better understand a few of the fundamental concepts of on-farm research.
- © 2003, Purdue University.
- Key Crop Management Issues for Optimizing Grain Yield
& Quality
- Adobe PDF version
(Presentation view) (1.8 MB)
Adobe PDF version
(Handout view) (1.6 MB)
- Adobe Acrobat formatted summaries of a presentation made
at the 5th
Australian Maize Conference, held 18-20 Feb, 2003, in Toowoomba,
QLD.
- © 2002-03, Purdue University.
- Maize: New Uses for an Old Crop
- Adobe PDF version
(Presentation view) (1.3 MB)
Adobe PDF version
(Handout view) (1.2 MB)
- Adobe Acrobat formatted summaries of a presentation made
at the FAR New Zealand
Maize Conference, held 12-13 Feb, 2003, in Hamilton, New Zealand.
- © 2002-03, Purdue University.
- Maize GE Benefits & Bugbears in the U.S.
- Adobe PDF version
(Presentation view) (1.7 MB)
Adobe PDF version
(Handout view) (1.4 MB)
- Adobe Acrobat formatted summaries of a presentation made
at the FAR New Zealand
Maize Conference, held 12-13 Feb, 2003, in Hamilton, New Zealand.
- © 2002-03, Purdue University.
- Developments in Agronomy & Maize Management
- Adobe PDF version
(Presentation view) (1.5 MB)
Adobe PDF version
(Handout view) (0.9 MB)
- Adobe Acrobat formatted summaries of a presentation made
at the FAR New Zealand
Maize Conference, held 12-13 Feb, 2003, in Hamilton, New Zealand.
- © 2002-03, Purdue University.
- Profitable Corn Management Strategies & Production
Practices
- Powerpoint® 2000 version
(18.4 MB)
Adobe PDF version (Presentation
view) (3.6 MB)
Adobe PDF version (Handout view)
(2.3 MB)
- Timeless ideas and suggestions for improving agronomic efficiencies,
and thus profitability, of corn production in Indiana.
- © 2002-03, Purdue University.
- Corn Growth & Development Related to Herbicide Use
- Adobe PDF version (Presentation
view) (1.5 MB)
Adobe PDF version (Handout
view) (460 KB)
- Many post-emergence herbicide labels restrict the size or age of corn
that can be treated. This Adobe Acrobat formatted version
summarizes a presentation made at the 2003 Southwest Indiana Corn and
Soybean Day held in Vanderburgh County, Indiana, on 10 January 2003
that offers insight into the uncertainties of determining corn growth
stages relative to herbicide usage.
- © 2003, Purdue University.
- Stress & the Common Corn Plant
- Adobe PDF version
(Handout view) (5.7 MB)
Adobe PDF summary
(98 KB)
- Corn's maximum yield occurs while it is still in the seed bag. After
the seed is planted, the remainder of the season is devoted to fighting
off stresses of every shape and size. This 2-page Adobe Acrobat
formatted publication summarizes a presentation made at the 2002 SW
Indiana Crops Conference, the 2002 Minnesota Crop Pest Management Short
Course, and the 2003 Illinois Crop Protection Conference that offers
insight into the effects of stress on corn growth and development throughout
the growing season.
- © 2002-03, Purdue University.
- Life's Little Corn Problems: Tips on Crop Diagnostics
- Adobe PDF version
(Handout view) (4.5 MB)
- This presentation shares my experiences in the art of crop diagnostics,
including what questions to ask, how to look at a field, how to resist
the know-it-alls, how to locate that missing puzzle piece, how to sneak
away from the crowd, how to stick your foot in your mouth, and how to
hem and haw with the best of them. I also share some experiences with
photography, including digital imagery, from the perspective of capturing
these precious moments in crop diagnostics. This Adobe Acrobat
document summarizes a presentation given at the 2002 Nebraska Independent
Crop Consultant Association Spring Workshop and revised for the 2002
Mid-Atlantic Crop Management School in Maryland.
- © 2002-03, Purdue University.
- Selecting Hybrids Wisely
- Adobe PDF version (Handout
view) (1.3 MB)
- Hybrid selection is among the most important decisions that a grower
makes each year, yet can be among the challenging.
- © 2002-03, Purdue University.
- A Corny Review of 2001
- Adobe PDF version (Presentation
view) (1.2 MB)
- Looking back at the previous year's corn crop can sometimes give us
insight into future crop management decisions. This Adobe Acrobat
document summarizes a presentation made at the 2002 Indiana Crop Improvement
Association Annual Conference.
- © 2002, Purdue University.
- Stalk Rots and Lodging in Corn
- Adobe PDF version (Presentation
view) (1.4 MB)
- Stalk rots and accompanying root & stalk lodging in corn can be
devastating in their effects on yield and harvest losses. This Adobe
Acrobat document summarizes a presentation given at a grower conference
in southern Indiana in November 2001.
- © 2001, Purdue University.
- Transgenic Crops in Indiana
- Adobe PDF version
(Presentation view) (1.5 MB)
- This Adobe Acrobat document summarizes a presentation
given as a guest lecture at Indiana University (Oct 2001) on the background
and issues of transgenic crops relative to Indiana farmers.
- © 2001, Purdue University.
- Adoption of SSCM Technologies
- Adobe PDF version (Presentation
view)
- This Adobe Acrobat document summarizes a presentation
about the adoption of site-specific crop management (SSCM) technologies
originally presented at the InfoAg 2001 Conference in Indianapolis (Aug
2001).
- © 2001, Purdue University.
- Off the Fence and Into the Field
- Adobe PDF version (Presentation
view)
- This Adobe Acrobat document summarizes a presentation
about my experiences with precision farming technologies originally
presented at the InfoAg 2001 Conference in Indianapolis (Aug 2001).
- © 2001, Purdue University.
- Sparse Versus Dense Spatial Data
- Online Powerpoint™
presentation
- An online version of a talk presented at the 2000 Purdue Top Farmer
Crop Workshop that emphasizes the importance of dense data sets for
interpolating spatial variability for yield influencing factors.
- © 2000, Purdue University.
- Improving Your Cost Efficiency of Crop Production
- Online
Powerpoint™ presentation
- An on-line version of a slide presentation that offers timeless ideas
and suggestions for improving agronomic efficiencies, and thus profitability,
of row crop production in Indiana.
- © 2000, Purdue University.
- Experiences with GPS-Enabled Cropping Technologies in
the Eastern Corn Belt
- Online Powerpoint™ presentation
- Adapted from a presentation given at the Unified Wine & Grape
Symposium in January 2000 at Sacramento, California.
- © 2000, Purdue University.
- Cyberspace & Agricultural Technology Transfer: An
Indiana Experience
- Online Powerpoint™
presentation
- An on-line version of a slide presentation sharing my experiences
using the WWW to fulfill my responsibilities as an Extension Agronomist
in Indiana. Adapted from a presentation given at the Annual Meeting
of the American Society of Agronomy, October 1998.
- © 1998, Purdue University.
- Understanding Factors That Limit Yield in Corn
- Online Powerpoint™ presentation
- An on-line slide presentation of issues relevant to the potential
for improving yields with Precision Farming technology.
- © 1998, Purdue University.
- Establecimiento Variable en el Maíz y Su Efecto
en la Producción de Grano
- (Spanish - español)
- Online Powerpoint™
presentation
- Adapted from a presentation given at the VI National Corn Congress,
Pergamino ARGENTINA, 12 - 14 Nov 1997. The Congreso Nacional de Maíz
was organized by the Asociación
de Ingenieros Agrónomos de la Zona Norte de la Pcia. de Bs. As.
(AIANBA).
- © 1997, Purdue University.
- Hot Topics in the Eastern US CornBelt
- Online Powerpoint™ presentation
- Adapted from a presentation given at the
Ontario Corn Producers Association Annual Convention, London, Ontario
CANADA on 25 February 1997.
- © 1997, Purdue University.
- Cyberspace & Agricultural Technology Transfer in
the 21st Century
- Online Powerpoint™ presentation
- Adapted from a presentation given at the University of Guelph, Ontario,
17 February 1997.
- © 1997, Purdue University.
- The Electronic Coffee Shop: Information Technology for
the New Electric Agriculture
- Online Powerpoint™ presentation
- A WWW presentation for the Managements of the Danish Agricultural
Advisory Centre, The Agricultural EDP-Centre and the The Danish Family
Farmers' Association, 4 June 1996, during a visit to Purdue University.
- © 1996, Purdue University.
- Establishing a Web Presence: An Extension Specialist's
Experience
- Online Powerpoint™ presentation
- Part of a larger discussion on "Weaving Your Way on the Web", presented
as a PUCESA Professional Improvement Seminar, 5 December 1995, on the
campus of Purdue University.
- © 1995, Purdue University.
- The Role of an Extension Corn Specialist in Indiana
Agriculture
- Online Powerpoint™ presentation
- Adapted from a presentation given at the
Executive Workshop on 'Preparing Hungary's Agricultural Universities
for the 21st Century: Integrating Teaching, Research, and Extension',
18-19 October 1995, Gödöllõ
University of Agricultural Sciences, Godollo, HUNGARY.
- © 1995, Purdue University.
My Background
![Nebraska Herbie](pix/site/herbie2.gif)
![The Corn Guy](pix/site/cornguy.jpg)
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