Crops Bulletin
July 1, 2014 
     Issue 6      

Prepared by

Paul Kassel

Extension Field Agronomist



(712) 262-2264




Serving Clay, Buena Vista, Dickinson, Emmet, Hancock, Kossuth, Palo Alto, Pocahontas, Sac and Winnebago Counties



The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Many materials can be made available in alternative formats for ADA clients. To file a complaint of discrimination, write USDA, Office of Civil Rights, Room 326-W, Whitten Building, 14th and Independence Avenue, SW, Washington, DC 20250-9410 or call 202-720-5964.

Soybean Replant:

- Expect a 50-60 percent yield reduction with an early July planted soybean crop compared to a normal planting date.

- Actual soybean yields may to be 15 to 25 bu/a when planted in early July.

- Consider early group I varieties for planting after July 1. Later maturing varieties will work also but will be more susceptible to an early frost event.


Summer Forage: The following are some forage/bedding crop/cover crop options where corn or soybean acres have been lost. Steve Barnhart has more info in this ICM News article.


Crop                                         Dry Hay Yield, Ton/Acre

German millet, one cut                                1-2

Japanese millet, multi-cut                            1-3

Proso millet, multi-cut                                 1-3

Sudangrass, multi-cut                                 1-3

Sorghum-sudan hybrids                               2-4

Grain bearing forage sorghum            8-10 (wet silage yield)

Corn                                                 7-9 (wet silage yield)


Staging Soybean Development: Soybean staging is important for timing of herbicide and fungicide applications. This article has visual descriptions of soybean stages. 


R1 stage = one open flower at any node on the main stem.


R2 stage = open flower at one of the two uppermost nodes on the main stem with a fully developed leaf.


Potato Leafhopper: Recent weather has limited development of leafhopper populations. However, leafhoppers can increase rapidly with typical summer weather. More info is available here.


Growing Degree Days (GDD): The following are GDDs from April 22 to June 30.

  • NW crop reporting district - 996 (-3).
  • NC crop reporting district - 929 (-46).
  • WC crop reporting district - 996 (-10)


Mid-season Crop Management Clinic - July 9, 2014 at the ISU FEEL lab near Boone. Pre-registration is required by July 2.

Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: