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.

Corn Disease Publication Now Available

October 16, 2008

By Alison Robertson, Department of Plant Pathology
Corn producers and other professionals in the agriculture industry depend on the Iowa State University Extension publication Corn Diseases, PM 596. It is always in high demand, and after a revision, is back on the shelf to be ordered from the Extension online store.

Watch the Soil Temperature

October 13, 2008
Map of Iowa 4 inch soil temperatures Oct. 12, 2008

By Elwynn Taylor and John Sawyer, Department of Agronomy
Soil temperature is the best indicator we have to reduce the risk of nitrogen loss when fall application of anhydrous ammonia, or manure with high ammonia content, is deemed expedient.  Experience has taught us that the conversion to nitrate is greatly reduced at soil temperatures below 50 F, though not totally avoided.

Fall Tillage Considerations for Soybean Disease Management

October 8, 2008
Image of soybean plants with sudden death syndrome

By XB Yang, Department of Plant Pathology

Fall tillage operations become a consideration at harvest time, and plentiful soil moisture makes moisture conservation a non-issue. However, the management of soybean diseases could be a consideration if you have fields with severe disease problems this year.

Deciding Between Grain and Forage Harvest for Late Maturing Soybeans

October 6, 2008
Table of yield and quality of soybean forage as affected by harvest maturity

By Stephen K. Barnhart and Palle Pedersen, Department of Agronomy

Late season evaluation involves reviewing normal crop growth and development, assessing the condition of the crops in individual fields relative to normal, and thinking through several autumn season scenarios such as: How will this field develop between now and the normal frost time?  What are the concerns or alternatives if a frost comes one or two weeks earlier than normal?

Fall Frost Effects of Forage

October 6, 2008

By Stephen K. Barnhart, Department of Agronomy
The first frost of the autumn generally brings a flurry of forage related questions centered around three general topics:

  • toxic prussic acid potential and management of frosted sudangrass and sorghum sudangrass hybrids;
  • is frosted alfalfa toxic to grazing animals; and
  • now that we've had frost, should I harvest the last alfalfa cutting?