Most customers in the Hoegemeyer footprint received some much-needed rain over the last several days. Many areas of Nebraska received a nice, gentle rain, totaling between 1 and 4 inches, but a good portion of central Nebraska received totals in excess of 6 inches. Producers have been calling, asking, “How long will my newly emerging crop survive being ponded or flooded?” Here are some guidelines taken from the University of Nebraska-Lincoln Extension.
Small seedlings will be more susceptible to flooding and ponding than larger plants. The smaller the plant stature, the better chance of it being covered with silt, getting mud in the whorl (which can lead to both fungal and bacterial pathogens causing stand loss), or just not having the ability to respire. Germinating seeds are living organisms and require oxygen to survive. Oxygen levels in fully submerged soils will be down to zero after 48 hours. Cooler air temperatures could help, as we are experiencing now, but it is unlikely that any seed, emerged or not, will be able to survive more than four days under water. Larger seedlings could survive up to four days in saturated conditions if air temperature is below 80 degrees Fahrenheit (See Table 1). If temperatures get into the 90s, corn seedlings may only survive for 24 hours.
Soybeans will share a similar fate to corn. Soybeans that have been submerged for two days will likely experience stand losses of 20 to 40%, depending on conditions after the flooding or if ponding subsides. Soybeans that are submerged for more than two days will likely need to be replanted.
If you feel you may need to replant, or have unexpected stand loss, don't hesitate to reach out to your local Hoegemeyer representative so we can help evaluate options. Hoegemeyer also offers free replant to Hoegemeyer corn customers who are part of the loyalty club, and free replant for any customer using Hoegemeyer brand LumiGEN soybean seed treatment. Evaluating and resolving these issues as early as possible will get you on track to having the best opportunity for a successful crop.
- Craig Langemeier, Western Product Agronomist
corn, replant guidelines, soybeans
Early frost damage is a concern for growers throughout the Western Corn Belt each Spring with the unpredictability of Midwest weather. After the freezing temperatures we experienced last weekend, determining the level of frost damage to plants is important for producers. With many of our producers finishing up planting, we understand the importance of knowing how the freeze impacts your plants.
Some plants will recover from early frost, however depending on the damage, some may need replanting. Corn can survive a frost if a seedling’s growing point is not affected.
What steps should you take after a frost?
Analyze the frost damage – Frozen leaves will turn silver in the first few hours after temperatures return to normal. Leaf tissue becomes dark and water-soaked, then brown and dry. New leaves will typically emerge within 3-4 days if the growing point is unharmed.
Patience. Patience. Patience. Waiting for new growth to emerge is necessary to make a final decision on potential harm done to the crop.
Decide if replanting is required – After 3-4 days, the extent of damage can be better determined. To accurately establish an estimate of the damage, check out plants from three different parts of the field.
Corn seedlings can handle frost much better than soybean seedlings. The growing point of corn doesn’t emerge from the soil surface until V5-V6 stages. Soybeans growing point is located above the cotyledon; but has risk of frost damage as the cotyledons are emerging through the soil. Below is a picture of a soybeans plant structures. Notice the growing point just above the Unifoliate leaf.
Soybean replant decisions should be based on accurate stand count and interacting factors, including yield potential of the existing stand, planting date, maturity group, and the true cost of replanting. Unfortunately, producers tend to make replant decisions based on quick visual estimations that often underestimate the existing plant population. Seedlings are usually in an early vegetative growth stage with only a few leaves when early stand counts are made. Narrow row widths exaggerate the impression of a low stand level because there are larger within-row spaces between plants.
-Eric Solberg, Eastern Region Product Agronomist
This spring has been a whirlwind of weather patterns throughout our region. While many farms have corn and even soybeans out of the ground, and others are still weeks away from planting, knowing your options for the possibility of a replant before that seed gets put into the ground can ease some tension if the problem may arise.
First and foremost, know that as a 100% by-crop customer of Hoegemeyer that is planting products with the LumiGEN™seed treatment, you have the opportunity to get your replant seed for FREE*. Even if you are not a 100% customer, know that, under some conditions, you may still have this opportunity. Speak with your DSM or Agronomist to learn more.
It is also important to consider the potential for yield loss from delayed planting due to replant. The possibility of a reduced stand in your first planting may still be more feasible than the potential yield loss due to a shorter growing season that your replant seed will have to deal with. While every situation is different, the main points to consider no matter what weather or planting situation you’ve been dealt is outlined below.
Planting date - and possible planting date of the replant
Expected stand loss
Hybrid or variety planted
Soil conditions that may hinder any growth problems into the future
In summary, if you feel you may need to replant or have unexpected stand loss, don't hesitate to reach out to your local Hoegemeyer representative so we can evaluate options. Evaluating and resolving these issues as early as possible will get you on track to having the best opportunity for a successful crop.
- Jonathan Williams, Southern Team Product Agronomist
*Refer to 2018-19 Hoegemeyer Business Manual for specific Replant Program Guidelines
Components of LumiGEN technologies for soybeans are applied at a Corteva Agriscience, Agriculture Division of DowDuPont production facility, or by an independent sales representative of Corteva Agriscience or
its affiliates. Not all sales representatives offer treatment services, and costs and other charges may vary. See your sales representative for details.
Seed applied technologies exclusive to Corteva Agriscience and its affiliates.®, TM, SM Trademarks or Service Marks of Dow AgroSciences, DuPont or Pioneer and their affiliated companies or respective owners.
Corn, Corn and soybeans, Jonathan Williams, LumiGEN seed treatment, replant guidelines, Soybeans