Integrated Crop Management News

Links to these articles are strongly encouraged. Articles may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If articles are used in any other manner, permission from the author is required.

Field Testing of N-Hibit™ Seed Treatment in Iowa*

May 2, 2008
Map of the locations of experiments in 2007 where n-Hibit seed treatment was evaluated

By Greg Tylka and Chris Marett, Department of Plant Pathology


N-Hibit™ is a seed-treatment that contains harpin protein, a compound that can stimulate plant defense responses. N-Hibit™ is now being sold in the United States for management of the soybean cyst nematode (SCN).  Iowa State University evaluated the effects of N-Hibit™ seed treatment on soybean yield and SCN population densities in experiments at nine locations throughout Iowa in 2007.


Surface Waters: Ammonium is Not Ammonia – Part 2

May 2, 2008

By John Sawyer, Department of Agronomy

A previous article explained the difference between ammonium and ammonia, the relationship between the two nitrogen forms and the implication of a combined (ammonium-N plus ammonia-N) analysis related to water quality criteria for aquatic life. This article focuses on the implication of ammonia and ammonium for chlorination of drinking water.

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