Considerations for Replanting Corn

Categories: PLANTING, CORN
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  • Always start your replant decision with a good assessment of remaining stand and its productivity
  • The Golden Harvest replant app simplifies the process for understanding replant yield advantage
  • Yield advantages associated with replanting can be negated by replant costs exceeding the value of additional grain
Many factors can cause unexpected stand loss or unevenness. Deciding to replant for desired plant population can be difficult. Before making a replant decision that incurs additional costs, it is important to evaluate the existing stand, plant health, plant spacing, uniformity and yield potential in comparison to what might be achieved by replanting. 

Taking emotion out of the equation and making a data-driven decision based on yield and economic advantage or disadvantage of replanting is critical. Making good decisions can be broken into the 2 steps listed below: first, determine if a yield advantage exists, and second, understand if the yield advantage is large enough to overcome the incremental costs that go along with replanting.
  • Yield advantage of replanting
    1. Determine plants per acre remaining
    2. Evaluate stand productivity by viable plants, spacing and uniformity of emergence
    3. Estimate the yield potential of a delayed planting
  • Consider economics of replanting
    1. Replant input costs such as time, labor, seed cost, fuel, wear on equipment and drying costs
    2. Understand if replant input costs cancel out replant yield gain
1. Determine Plants Per Acre Present 
The first step in determining a field’s yield potential is to understand how many viable plants are still present. Count the number of plants in 1/1,000th of an acre (see reference chart below as a guide) and multiply by 1,000 to obtain number of plants per acre. Attempt to divide fields into manageable zones you’re considering replanting, and take the average of multiple stand counts within the area.
 

2. Calculate Expected Yield from Existing Stand
To help transform your stand count info into a data-driven decision, Golden Harvest has developed a calculator to understand if existing stands will yield more or less than a delayed replant scenario. Go to https://geodav.syngentadigitalapps.com/ReplantApp/ and enter your original and replant dates, along with current and anticipated replant stand counts, to quickly understand the yield benefit or loss from replanting. 

3. Adjust for Stand Productivity of Surviving Plants
Understanding the number of surviving plants is important for determining yield potential. However, yield potential can be further decreased without uniform plant emergence. Research has commonly found an additional 4-6% yield loss when multiple plants (17-75% of the stand) emerge 6-12 days later than the remainder of the plants. Uneven emergence can be quantified by comparing the number of leaf stages present between plants. In cases where there are differences of 2 or more leaf stages on at least half of the emerged plants, add an additional 10% yield potential toward the replant advantage of the field you’re evaluating.

4. Consider the Economics

    Delayed field emergence with more than 2 leaf stages difference


In absence of a yield advantage for replanted corn, it is easy to make a decision to not replant. It is much more difficult to make replant decisions when small yield advantages exist. In these scenarios, it is important to consider replant seed, grain drying, herbicide, insecticide, tractor fuel, labor and equipment depreciation costs. Combined, these costs could easily offset a 5-10% yield advantage for replanting.

Should You Replant an Earlier Corn Maturity?
Depending on when you can get back into the field to replant, you may need to consider moving to an earlier corn relative maturity. Careful consideration around anticipated fall frost dates, and your ability to manage higher moisture corn, must be understood when contemplating switching to an earlier corn hybrid. Refer to “Should I switch to an earlier maturity corn hybrid?” for more detailed information. 

Golden Harvest Replant App Tip:
  1. Enter the replant app at https://geodav.syngentadigitalapps.com/ReplantApp/ from your iPhone Safari app
  2. Select the icon at bottom of screen and then select “Add Bookmark” to your favorites to have easy access when evaluating stands in your fields.  
Contact your Golden Harvest Seed Advisor with questions or for additional agronomic insights.

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