NK Seeds offers a free “Corn Replanting Calculator” tool to help farmers make corn replanting decisions

NK® Corn Replant Calculator recommendations are generated from publicly available data, and calculations are based on farmer location, original planting date, replanting date, seed density, current planting and the desired planting density. Although the calculator provides replanting recommendations based on academic data, there is no definitive resource for replanting decisions.

“Farmers make countless decisions throughout the growing season, but the decision of whether or not to replant a corn crop is arguably one of the most important in terms of potential return on investment,” says Todd McRoberts, Agronomy Manager NK Seeds. “It’s not always a black and white decision, but there are simple steps farmers can take to build confidence in their decision to invest in replanting.”

Steps to consider for potential replanting

  1. Determine your existing stand. To estimate stand, count the number of healthy plants in the length of a row that equals 1/1000 of an acre (Table 1) and multiply the number of plants by 1000.

    “Make multiple counts in different areas of the field to get an accurate end position,” advises McRoberts. “If stand loss is occurring in separate areas, limit your stand count measurements to the areas to be replanted.”

  2. Compare estimated replant yield potential to existing stand potential. Refer to Table 2 to determine your corn percent yield potential by emerged stand and planting date.

    “This calculation will provide a lot of clarity on the potential return offered by the two options,” adds McRoberts.

  3. Decide if relative maturity needs to be reduced for replanting. Once a farmer decides to replant corn, the next big decision is whether to cut back the hybrid RM.

    “Choose a hybrid that can reach maturity before the first frost,” says McRoberts. “Hybrids compensate for the abbreviated growing season and will reach the black layer in fewer growth degree units than if planted earlier.”

Now is the time for farmers to design a replanting plan, if necessary, and decide if a different RM is needed. McRoberts warns that the increased yield potential of a fuller season hybrid often exceeds the cost of drying the grain. He recommends that farmers plant full-season hybrids suitable for a given area until the last week of May, then switch to a mid-season hybrid (4-7 RM) — and never switch to 8-11RM hybrids earlier than suitable mid-season hybrids unless grain drying is not an option.

Visit NKSeeds.com/ReplantCalculator to access the NK Corn Replant Calculator. To learn more about NK corn hybrids or soybean varieties in your area, contact your NK Seeds retailer.

* The Replanting Calculator is provided by Syngenta as a reference tool for agronomists and farmers. It is not intended to be and should not be used as a definitive source of agronomic advice on any subject. The Replant Calculator provides data gathered from the academic data and publications listed below. Syngenta assumes no responsibility for the results of this data, nor does it represent that the data is current. Universities periodically update their databases; therefore, the replant calculator may not reflect the most recent data.

About Syngenta
Syngenta Crop Protection and Syngenta Seeds are part of the Syngenta Group, one of the world’s leading agricultural companies. Our ambition is to help feed the world safely while taking care of the planet. Our goal is to improve the sustainability, quality and safety of agriculture through world-class science and innovative cultivation solutions. Our technologies enable millions of farmers around the world to make better use of limited agricultural resources.

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SOURCE NK Seeds

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