Blog

Jody Korthaus
May 23, 2016 2:57 PM

A lot of soybean planting progress was made across the state this past week, as farmers tried to get ahead of this week's daily rain forecast. Most corn planting has been completed in Iowa, with 75% already emerged, according to the May 23 USDA Crop Progress Report....

Crop Production

Meaghan Anderson
May 20, 2016 12:29 PM

Alison Robertson
May 20, 2016 12:29 PM

Several corn fields in southeast Iowa are having disease issues this spring. After visiting with several ag retailers and farmers, I had Alison Robertson and Tom Kaspar, a plant physiologist with the USDA-ARS, out yesterday to look at some fields with issues. When we put all the pieces together...

Plant Diseases

Bob Hartzler
May 20, 2016 9:47 AM

I've had several questions on how long to wait following the frost event this past weekend before making a postemergence application. The answer depends on several factors, including 1) stage of corn at frost injury, 2) vigor of corn at time of frost, 3) weather following the frost, and 4)...

Weeds

Bob Hartzler
May 19, 2016 1:08 PM

While driving to a field plot in Webster County earlier this week I saw a land roller being used in a field. My first thought: "If we have time to roll fields, why is there such resistance to the suggestion of mechanical weed control?"

Most farmers of my age have memories of long days on...

Weeds

Bob Hartzler
May 18, 2016 6:26 AM

Scouring rush and field horsetail are two species in the Equisetum genus. These are primitive plants that produce spores rather than seeds, but they spread primarily by underground rhizomes. Until recently these two weeds were found primarily in roadside ditches, but the reduction in...

Weeds

Paul Kassel
May 16, 2016 1:52 PM

My area has a real range of conditions with corn planting 65-75% complete in the northwest part of my area. There is maybe 15% of the soybean crop planted in the northwest part of my area. The corn and soybean planting progress is 95%+ complete in the northeast part of...

Crop Production

Mark Licht
May 16, 2016 8:51 AM

Temperature is the key for both corn and soybean. Temperature below 28oF for a couple of hours will be lethal to growing tissue that has emerged. Temperatures between 28oF and 32oF will result in definite frost injury to above ground tissue. And temperatures...

Crop Production

Erin Hodgson
May 16, 2016 8:41 AM

As Merle Haggard said in his song, Under the Bridge, “you’ll find some great grub feedin’ here below.” I got a couple calls about grub injury in seedling corn last week and how to identify annual grubs (e.g., masked chafers and Japanese beetle) from true white grubs (May and June beetles) with a...

Crop Production, Insects and Mites

Joel DeJong
May 13, 2016 11:16 AM

In the NW corner of Iowa it has, once again, been a wet week. There have even been localized rains as high as 6" for the week, although most received significantly less. Getting back to planting, it's has been difficult, and we are lagging the rest of the state in planting progress. We aren't...

Crop Production

Jody Korthaus
May 9, 2016 4:47 PM

Iowa has 80% corn planted as of May 8, according to Monday's USDA Crop Progress Report, up from 57% the previous week. The report shows that soybeans planted also made a notable jump from 7% complete on May 1 to 29%.


Many farmers were able to get back in the...

Crop Production

Clarke McGrath
May 6, 2016 4:08 PM

I've been getting a lot of questions about needing additional N for corn; growers are torn between putting some UAN in with herbicides vs. spreading urea. I’d caution them against using UAN as a carrier on emerged corn if they are applying herbicides. Yes, there are a few products that allow...

Crop Production, Soil Fertility

Angie Rieck-Hinz
May 5, 2016 12:33 PM

My home drinking water source comes from the Xenia Rural Water District. Depending on where you are located within the district, your water comes from an alluvial aquifer, or surface water from the Raccoon River or the Des Moines River. The water is treated and delivered to my home and,...

Crop Production

Paul Kassel
May 4, 2016 1:58 PM

We have had a couple nice days and farmers are looking forward to some predicted good weather. Farmers are taking this all in stride since many have been through this before.

There has been a fairly abrupt line of heavy rainfall/planting progress in the area. Areas east of roughly highway...

Crop Production

Jody Korthaus
May 4, 2016 9:39 AM

As of May 1, the USDA reported 57% of corn had been planted in Iowa. See below for area conditions and planting progress around the state from Iowa State University Extension and Outreach field agronomists. ISU...

Crop Production

Jody Korthaus
May 3, 2016 3:52 PM

The United States has almost half of the corn crop planted for the season at 45% complete, according to the United States Department of Agriculture (USDA) Crop Progress Report on May 2.

The USDA reported 57% of corn planted in Iowa as of May 1, with the 5-year average being 28%. The...

Crop Production

Clarke McGrath
May 3, 2016 3:12 PM

Mark Licht
May 3, 2016 3:12 PM

Replanting is something we hope we don’t have to do a lot of, but if we do, there are some good resources to use to help make those decisions.

Stand assessment and replant decisions are often (OK, almost always) agonizing. It is hard to leave a stand that is below a growers normal...

Crop Production

John Sawyer
May 3, 2016 9:45 AM

You should visit the newly formatted and revised Corn Nitrogen Rate Calculator (CNRC) website. The site has a new url ( http://cnrc.agron.iastate.edu/ ). For Iowa, there are now two regions, the Main Iowa area and a Southeast Iowa area (SEIA) – see...

Soil Fertility

Paul Kassel
April 29, 2016 4:18 PM

We have had a couple windows of opportunity for fieldwork this spring. The week of April 10 to 17 saw a lot of fieldwork completed. Also, there was some fieldwork completed on April 23. I am referring to an area around Clay County and parts of Dickinson and Buena Vista counties.

However,...

Crop Production

Mark Hanna
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

Clarke McGrath
April 25, 2016 11:52 AM

Corn typically requires 90 to 120 Growing Degree Days (GDD) from planting to emergence. Of course this GDD range assumes adequate soil moisture and varies with planting depth, tillage system and residue cover. As a rule of thumb, if 120 GDD have accumulated since planting and seedlings haven’t...

Crop Production

Bob Hartzler
April 23, 2016 9:48 AM

Had a question why winter annuals, specifically henbit, are so thick this year.  Two main factors: 1) ample moisture at the end of last year's growing season, and 2) a relatively mild winter.  Most winter annuals emerge in late August-September, in many years we don't have...

Weeds

Rebecca Vittetoe
April 20, 2016 1:25 PM

I’ve received a few questions asking what the purple weed is that is appearing in the landscape. It is probably either purple deadnettle (Lamium purpureum) or henbit (Lamium amplexicaule).


These weeds often get confused because they look similar...

Weeds

Alison Robertson
April 20, 2016 11:12 AM

Many of you are aware that a few years ago we collected diseased soybean seedlings from fields across the Midwest and identified organisms associated with the rotted roots. This soybean seedling disease survey was funded by USDA-NIFA and soybean check-off and the identification of the organisms...

Plant Diseases

Meaghan Anderson
April 20, 2016 10:24 AM

I received one report of a cereal rye control failure this week as temperatures warmed and rye growth resumed. Some follow-up questions and photos showed that concerns regarding burndown applications during cool, early-spring conditions have merit.

A southeast Iowa farmer applied 1.5 lb...

Weeds

Paul Kassel
April 19, 2016 2:42 PM

The recent rainfall broke a string of dry days for us. Spencer received about 0.7 inches of rain. Storm lake, Spirit Lake and other areas in the highway 71 corridor received a similar 0.4 to 0.7 inches. However, areas east of Highway 4 did not receive much rain and are returning to the field...

Crop Production

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