2017 Willie Woltz Seminar

Dr. Jerry Hatfield

Laboratory Director
USDA-ARS National Laboratory for Agriculture and the Environment
Ames, Iowa

Tuesday, April 18, 2017 – 3:00 PM – 2405 Williams Hall
Impacts of Climate on Agriculture
Understanding the linkages between the environment and plant growth and
productivity provides the basis for building a climate smart agricultural system.

Wednesday, April 19, 2017 – 3:40 PM – 2215 Williams Hall
Challenges for Agriculture to Address Production and Environment Goals
Agriculture faces two major challenges: continuing the increase production to meet
future demands for food, feed, and fiber; and reduce the environmental impacts.



A. Douglas Worsham Weed Science Lecture Series – February 23, 2017



Modeling Indaziflam Behavior and Performance: Implications for All Herbicides


Dr. Michael R. Schwarz
R&D Fellow, Agronomic Development
Crop Science Division
Bayer CropScience LP


February 23, 2017
Refreshments at 2:30 pm
Seminar at 3:00 pm
2405 Williams Hall


Michael Schwarz received his Ph.D. in Plant Pathology from the University of Wisconsin.  He has since held positions as an Extension Associate and Adjunct Professor of Plant Pathology at Cornell University, and various positions within Bayer CropScience such as Director of Seed Treatment Product Development, Group Leader for Fungicide Early Development, and Field Development Representative in the Northeastern United States.  Dr. Schwarz currently holds positions of R&D Fellow, Agronomic Development, at Bayer CropScience with primary responsibilities for developing and implementing integrated crop protection solutions for horticultural crops, and Adjunct Professor of Plant Pathology at North Carolina State University.  Dr. Schwarz has been recognized as an innovative leader in the development and implementation of short- to long-term strategic initiatives for seed treatment, soil-insecticide, fungicide, herbicide, nematicide, biological control, and transgenic solutions.


The series is named in honor of Dr. Douglas Worsham.  Dr. Worsham had a distinguished career in weed science at North Carolina State University for many years.  He had a positive influence on many students at both undergraduate and graduate levels.  Dr. Worsham also served many groups in North Carolina as well as groups at national and international levels through his generosity in sharing his knowledge and expertise in weed science.  Dr. Worsham has long been considered a unifying figure among weed scientists at North Carolina State University.

Farm to Feast Dinner at the NC State Agroecology Education Farm.


Exit Seminar – Evaluating the flush of CO2 as a Short-Term Biological Indicator of Soil Nitrogen Availability

Soil Science Exit Seminar
Mary Pershing, M.S. Student, Soil Science, NCSU, will present an exit seminar titled:

“Evaluating the Flush of CO2 as a Short-Term Biological Indicator of Soil Nitrogen Availability” (under the direction of Dr. Alan Franzluebbers)

on 30 September 2016 at 9:00 am in the McKimmon Room (2223 WMS).
All are welcome to attend.

Determining the appropriate nitrogen (N) rate for field crops is critical to farm economics and environmental protection. In North Carolina, N fertilizer recommendations are not modified by residual inorganic N or biologically active N, but only by realistic yield expectation set for each soil type and crop. However, due to increasingly popular conservation management practices such as cover cropping and no-till farming, residual N can remain in the soil in a biologically active form for potential plant uptake, resulting in greater supply of N than expected. Measuring biologically active carbon (C) is strongly related to net N mineralization, and may be less complicated, expensive, and time consuming than measuring biologically active N, due to the rapidly changing nature of soil N. Soil samples (n=759) from research stations and private farms representing three physiographic regions of North Carolina (coastal plain, piedmont, and mountains), as well as from cooperating locations in Virginia, Pennsylvania, Oklahoma, Nebraska, and Georgia were analyzed for various soil chemical and biological properties in the laboratory and utilized in four separate greenhouse growth trials. Unfertilized Sorghum bicolorwas grown for eight weeks in each soil sample to test for N availability. Dry matter accumulation and N concentration of plants were measured, which allowed for determination of above ground plant N uptake. The flush of CO2 following rewetting of dried soil was a key indicator of interest, as was net N mineralization during 24 days, soil microbial biomass C, particulate organic C and N, and total organic C and N. In Greenhouse Trial 1, the flush of CO2 was the second best indicator of greenhouse growth (R2=0.78) behind net N mineralization (R2= 0.81). In Greenhouse Trial 2, total soil N was the best indicator of greenhouse growth (R2 = 0.82). In Greenhouse Trial 3, the flush of CO2was the best indicator of greenhouse growth (R2 = 0.96). In Greenhouse Trial 4, the flush of CO2 was the second best indicator of plant N uptake (R2=0.83) behind net N mineralization (R2= 0.88). Among all samples, the flush of CO2 explained 69% of the variation in N uptake. The slope to predict greenhouse growth in soils from Oklahoma, Georgia, and Pennsylvania, was significantly different from Virginia and North Carolina. The interaction effect of state on the flush of CO2 improved prediction of dry matter production from 50 to 71% and of plant N uptake from 68 to 89%. Samples originating from NC and VA (n=516) were predicted by the flush of CO2 with an R2=0.81 for plant N uptake and R2=0.66 for dry matter production. The biologically active fraction of organic matter was the most dominant and consistent way to determine plant N uptake in this study (i.e. through net N mineralization and potential C mineralization). Sometimes soil nutrient concentrations and initial inorganic N were additionally helpful. In conclusion, the flush of CO2 has the potential to be a simple, rapid, and reliable predictor of potentially available N in the mid-Atlantic United States.  

Seminar – Text recycling and self-plagiarism in scientific research writing

Thursday, September 22
3:30pm in 2405 Williams Hall


Cary Moskovitz, Ph.D.
Director, Writing in the Disciplines
Duke University, Thompson Writing Program

“Text-recycling” refers to a writer’s reusing excerpts from previously published writing, either verbatim or in a slightly altered form, in a new publication without attribution. This practice is more common and accepted than generally acknowledged, especially in the natural and medical sciences, where it is often tacitly expected. In contrast, textual recycling is generally considered anathema in the humanities, where it is likely referred to as “self-plagiarism.” Those who practice textual recycling in academic writing have two motivations: convenience and consistency. In contexts where originality of prose is not highly valued, authors have no motivation to rework prose that does its job effectively merely for the purpose of avoiding replication. Maintaining consistent language from one paper to another stabilizes meaning for readers of multiple papers comprising an ongoing line of research. Examples from different fields demonstrate the regularity of textual recycling and show that recycling tends to occur at specific locations such as in the introduction and methods sections of scientificresearch reports.  Despite its frequent use, textual recycling is routinely ignored in writing guides, textbooks, and writing courses—even in the sciences. This talk concludes with comments on pedagogical implications for writing instruction.

Agroecology Education Farm ‘Open House’ on Friday, Sept 16 – 3:30 – 5:30

12971078_697231963713713_2931705674774030045_oAgroecology Education Farm ‘Open House’ on Friday, Sept 16 3:30-5:30.

Where: Agroecology Education Farm, 4400 Mid Pines Rd, at the Lake Wheeler Field Station
(*we are on google maps).
You can drive in a park before the hoop house.
All are invited to join us for a mixer at the Agroecology Education Farm to kick off the new semester.
For faculty and staff, come out for the first time to see how you can use this facility for your classes or revisit us and let us know how we can improve things.
Students come out and meet other agroecology undergraduates and graduate students with similar interests.
Come out and see the new hoop house and what’s happening on the farm!
Light refreshments and hors d’oeuvres will be served.
NC State Agroecology Education Farm  website:

Dr. Rex Liebl inaugural speaker of the “Arch Douglas Worsham Weed Science Lecture Series”

Drs. Rex Liebl (left) and Doug Worsham (right) following the first seminar in the “Arch Douglas Worsham Weed Science Lecture Series” on September 1.

Drs. Rex Liebl (left) and Doug Worsham (right) following the first seminar in the “Arch Douglas Worsham Weed Science Lecture Series” on September 1.


Dr. Rex Liebl of BASF Corporation, pictured on the left, was the inaugural speaker of the “Arch Douglas Worsham Weed Science Lecture Series” on September 1.  His seminar was entitled The Challenge of Herbicide Resistance: Possibilities for New Sites for Herbicides.  The series is named after Dr. Doug Worsham, retired faculty member in the Department of Crop Science at North Carolina State University who did pioneering research in the area of weed management in conservation tillage systems.   In his introduction, Dr. Alan York pointed out the many contributions Dr. Worsham made to the department, university and state as a faculty member.  He also told the audience that one of Dr. Worsham’s greatest legacies continues to be his instruction of the undergraduate weed science course at North Carolina State University.  This interaction helped establish a foundation for many individuals that has proven valuable in their careers.

Future speakers in the series include Drs. David Mortenson and Stanley Culpepper.  Along with Dr. Liebl, these individuals received their PhD at North Carolina State University in the discipline of weed science and have gone on to have productive and impactful careers. – Dr David Jordan

Seminar – Dr. Rex Liebl of BASF Corporation

Arch Douglas Worsham Weed Science Lecture Series

September 1, 2016
Witherspoon Student Center
Washington Sankofa Room
Refreshments at 3:00 pm, Seminar at 3:30 pm

The Challenge of Herbicide Resistance: Possibilities for New Target Sites for Herbicides

Dr. Rex Liebl of BASF Corporation


The series is designed to be an annual event that includes three to five lectures from a broad spectrum of weed scientists. It is named after Dr. Doug Worsham who had a distinguished career at NC State, making contributions in witchweed management, no-tillage systems and other important aspects of sustainable weed management.

Seminar – Laura O. Taylor

Thursday, August 25th at 3:30 in 2405 Williams Hall

Water Resources, Land-Use, and Valuing our Natural Capital

Laura O. Taylor
Professor, Department of Agricultural and Resource Economics
Director, Center for Environmental and Resource Economic Policy (CEnREP)

This seminar will provide an overview of a few select research projects in water resource management, land-use change modeling, and non-market valuation of our natural resources.  Focus will be given to framing research questions through the lens of economic science, broadly describing methodological approaches, and summarizing research results and impacts.  The goal is to provide insights into environmental economics research that can further stimulate collaborative research among natural and physical scientists and economists.