Mark Hanna

Dr. H. Mark Hanna is an extension agricultural engineer with Iowa State University. Hanna’s main focus is sustainable agricultural systems, including chemical application, energy consumption, tillage/planting, and harvest. His research focus has been on developing ways for field equipment to enhance productivity and environmental stewardship as machinery interacts with crops and soils. His research is accompanied by field days, conferences, and additional outreach activities within the industry. Dr. Hanna holds a number of honors and awards for his work in the industry, including: ASABE Fellow, ASABE Mid-Central Region Engineer of the Year award, and ISU College of Agriculture and Life Sciences Outstanding Achievement in Extension. 

Mark Hanna
September 14, 2017 12:31 PM

It’s always difficult to forecast weather, but if dry field conditions persist, potential for combine and field fires this fall could be a problem. All it takes is a single high-temperature source in the engine area, or an overheated bearing to ignite dry plant material.

During harvest...

Crop Production
June 6, 2016 11:53 AM

Increasing sprayer travel speed causes the controller to increase boom pressure (and decrease droplet size). If field conditions have you running behind and your sprayer travel speed has increased 20–25%, consider using one size larger nozzle tip to minimize drift potential.

Equipment and Machinery, Pesticide Education
April 25, 2016 3:46 PM

Accelerated, early planting in some parts of the state increases pressure on applicators of preemergence herbicide to speed up sprayers to cover a larger numbers of acres. Increased speeds increase boom pressure for existing nozzles, and can tempt applicators to increase boom height. Both...

Equipment and Machinery, Weeds
October 20, 2015 2:45 PM

By Clarke McGrath and Mark Hanna

It’s always difficult to forecast weather, but if dry field conditions persist, the potential for combine and field fires this fall will continue to be a problem. There have already been dozens of significant field fires around the state,...

Crop Production