Crops Bulletin
May 23, 2013
       Issue 4            

 

Prepared by

Paul Kassel

Extension Field Agronomist

 

 

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.

 

 

Corn Late Plant/Replant Information:

 

Planting     DKC 3353     DKC 4327      DKC 4837     DKC 5509 

Date                  RM 83        RM 93           RM 98           RM 105

     ----------bu/a, % h2O---------

4/29               154                 185                 189                 199

5/17                    165                 192                 183                 204

5/27                151  15.4      180   15.3       182   16.8         176   19.2

6/9              129  16.4      146   18.6       143   20.7         128   27.1

Reduction      17%                22%              22%                  33%

 

 

Corn Planting Discussion:

  • Reduction compares May planting dates with the June planting date.
  • Planting in early June compared (98 day hybrid) to the average of the May planting dates reduces corn yields by 15 to 20%, or 25 to 40 bu/a.
  • Grain moisture at harvest increases by 4 points (98 day hybrid).
  • Very early hybrids (83 day) give up yield potential.
  • Reduce planting rates slightly to adjust for reduced yield potential.
  •  Replant when May planted corn is less than 16-20,000 plants per acre.

 

Crop Insurance: A discussion on delayed planting, prevented planting and replanting can be found at this link.

 

Corn Rootworm:

Damage from corn rootworm (CRW) is expected to be less when corn is planted in June. Currently we have 320 soil GDDs and 50% egg hatch occurs at 684 to 767 soil GDDS. However, since the hatch is so far behind, it will be advised to use the CRW insecticide or CRW traits when corn is planted in June.

 

Growing Degree Days:

  • Algona - 5/1 - 29, 280 (-50), 5/16-31, 160 (-10)
  • Forest City- 5/1 - 29, 300 (-20), 5/16-31, 165 (0)

Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: kassel@iastate.edu