May 23, 2019   
  Issue 3


Corn yields, delayed planting.  

This info is from a date of planting study from the ISU Northern Research Farm near Kanawha in 2017.   Info from 2014 -16 is available here .  
 
                        P0157AM                   P0589AM                   P1197AM       average
                        Yield   H20                 Yield   H20                 Yield   H20
                        bu/a     %                    bu/a     %                    bu/a     %
 
5/9/17              245      16.7                 274      16.7                 303      19.4         274
5/30/17            229      18.0                 241      17.4                 253      24.2         241
change            -7%      +1.3                -12%    +0.7               -17%     +4.8        -12%


  -  The delay in planting from early May to late May shows a yield decrease of 1.5 bu/acre/day and an increase in grain moisture of 0.1 point/day. 
-  The same study at the ISU NWRF/Sutherland had less impact from delayed planting.
-   Planting dates in mid-June produced ~120 bu/a yields with 20 to 30% grain moisture.
-   Corn hybrids require 7 fewer GDDs per day of delay to mature with delayed planting.  
-   The cost of drying 200 bushel per acre corn is about $7.00 per acre per point.  
-   Consider June 5 as a date to change from a corn crop to a soybean crop - because of reduced corn yield and added corn grain drying costs.
 
Soybean Planting . 
This date of planting information is from the ISU Research Farms near Sutherland (NWRF) and Nashua (NERF).   The info from the NWRF and the NERF might be optimistic - the info from PM1851 is based on more data and is more conservative.
 
Planting date               2014-16 NWRF          2014-2016 NERF              ISU PM1851
                                    -------------------- bu/a ----------------------              ---% yield ----
late April                                                                                                         100
early May                            69                                   59                                  96
mid May                              65                                   60                                  99
early June                            60                                   55                                  81
late June                                                                                                           61
early July                             51                                   46                                 33

·   Actual soybean yields may to be 45 to 55 bu/a when planted ~June 10.
·   Use an early group II variety until June 15 -20. 
 
     
Prepared by:
  Paul Kassel- Extension Field Agronomist

 

Phone:  (712) 262-2264

 
 
 

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

 

 

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The Iowa State University Extension and Outreach Policies Page.   

Prepared by Paul Kassel, Extension Field Agronomist

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