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1/21/2013 - 1/27/2013

Herbicide Resistance and Weed Management Tactics Survey

By Micheal Owen, Department of Agronomy

Farmer and agribusiness participation is requested in an online survey being conducted by Kevin Bradley at University of Missouri. Specifically, the survey is asking for input on adoption of cultural management practices across the Midwest in response to herbicide resistance. Specifically, the impacts of GR weeds and some of the changes that are occurring in weed management as a result.  Information on the adoption of cultural management techniques is of great interest. The survey is only 12 questions and this information will be most helpful in understanding weed management perspectives and actions. The survey can be found at The results will be presented at the Weed Science Society of America meetings.


Micheal Owen is a professor of agronomy and weed science extension specialist with responsibilities in weed management and herbicide use. He can be reached at (515) 294-5936 or e-mail

Soil Fertility Short Course Offered by ISU Extension and Outreach

By John Sawyer, Department of Agronomy, and Brent Pringnitz, Ag and Natural Resources

With high input costs and volatile nutrient prices, crop production professionals know it’s more important than ever to make sound management soil fertility decisions. A two-day short course offered by Iowa State University Extension and Outreach will focus on principles of soils, soil fertility and nutrient management to help those in crop production make important decisions.

The Soil Fertility and Nutrient Management Short Course will be held Feb. 13-14 at the Scheman Building on the Iowa State campus in Ames. In addition to classroom work, the course includes a tour of the ISU Soil and Plant Analysis Laboratory. Sign-in and refreshments will be available at 8:30 a.m. on Feb. 13 with classwork beginning at 9 a.m. The short course will conclude at 4:30 p.m. on Feb. 14.

A program brochure and registration form is available at Registrations can be completed online with a credit card, or online forms may be downloaded and completed to be faxed or submitted by mail.

Registration is limited to 40 participants and pre-registration is required. Registration and $275 course fee must be received by Feb. 6. Registrations will not be accepted at the door for this program. Registration includes a reference binder and class notes, lunches and breaks.

For more information, visit or contact ANR Program Services at 515- 294-6429 or


John Sawyer is a professor of agronomy with research and extension responsibilities in soil fertility and nutrient management. He can be reached at (515) 294-7078 or Brent Pringnitz is an ANR program services coordinator. He can be reached at (515) 294-6429 or

Reflections on Iowa's 2012 Drought

By Mahdi Al-Kaisi, Department of Agronomy

Enormous challenges were presented by the 2012 drought. Poor water availability and high temperatures resulted in significant stress during critical phases of corn (Zea mays L.) and soybean (Glycine max L.) development. These stress factors lead to management challenges with insects, diseases and reduced nutrient availability and uptake by plants. The drought triggered soil changes, particularly in conventional tillage systems, such as increased fracturing, crusting and deterioration of soil structure and aggregation. All this reinforced the need for soil conservation planning, especially its necessary role in buffering against unpredictable conditions and the impacts of dry and wet events on production and soil quality. In 2011, the USDA's National Drought Mitigation Center reported that 43 percent of Iowa experienced moderate-drought conditions and nearly 10 percent experienced severe-drought conditions. In 2012, 100 percent of Iowa experienced severe-drought conditions, while 65 percent experienced extreme-drought conditions by October. The article in the following link,, addresses several effects of drought on soil and crop production and lessons learned that will help develop appropriate drought mitigation strategies for future soil and crop management practices.

Mahdi Al-Kaisi is a professor in agronomy with research and extension responsibilities in soil management and environmental soil science. He can be reached at or 515-294-8304.

This article was published originally on 1/28/2013 The information contained within the article may or may not be up to date depending on when you are accessing the information.

Links to this material are strongly encouraged. This article may be republished without further permission if it is published as written and includes credit to the author, Integrated Crop Management News and Iowa State University Extension. Prior permission from the author is required if this article is republished in any other manner.