Integrated Crop Management News

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Corn Following Corn in 2008

July 3, 2008
Plant height differences between sorn following soybeans and corn following corn

By Mahdi Al-Kaisi, Roger Elmore, Antonio Mallarino, Palle Pedersen, Alison Robertson, John Sawyer, and Jon Tollefson

Degree Days Continue to Lag

July 1, 2008
Image of base 50 degree F degree days in regions of Iowa from May 1 to June 29, 2008

By Rich Pope, Department of Plant Pathology

Another week of slightly cool days with scattered storms has Iowa farmers facing uneven stands in many fields. Cumulative heat during the week of June 23 lagged behind long term averages by 10 to 25 degree days in Iowa. The cool temperatures and still wet soils provide stresses to struggling crops, and those stresses are showing up in poor growth.  As we get more heat the corn and soybean should recover, but this early summer has predisposed the crops to future stresses.

Flooding and Stored Grain

June 24, 2008

By Charles Hurburgh, Department of Agricultural and Biosystems Engineering and Dan Loy, Department of Animal Science


Floodwaters have soaked many grain bins on farms and at commercial elevators. With only a few exceptions, flood soaked grain is not useable for feed or food. Flooding affects both the stored grain and the storage structures.

Grain and Grain Products

A Cool and Thankfully Dry Week

June 23, 2008
Image of base 50 degree F degree days in regions of Iowa from May 1 to June 22, 2008

By Rich Pope, Department of Plant Pathology

Some good news this week, with much-needed access to fields gained across Iowa. Also on the positive side, hay harvest progressed rapidly and hay yields were reportedly good.

Although the week was a bit cooler than average, the dry weather was a welcome relief.

Degree day accumulations by Crop Reporting District

Is It Time to Switch Soybean Maturity Group Varieties?

June 21, 2008

By Palle Pedersen, Department of Agronomy

Many farmers were able to get back into the field this week and start finishing up planting. However, there are still many areas where fields remain flooded and it will take awhile before we can get back in and replant. Some fields need to be replanted and some don’t. It is important to accurately estimate a surviving stand and then evaluate the economics of replanting.