Flooded fields, replanting considerations for Ark. soybeans
click image to zoom Due to the excessive and record-breaking rainfall that occurred early Sunday morning, many fields in an area covering Prairie, Woodruff, Jackson, Monroe, St. Francis, and Cross Counties have been flooded or are still under water.
Currently, we are estimating that 100,000 acres of soybeans will need to be replanted, with many more soybean fields receiving some yield damage due to saturated soil conditions. Due to many of the ditches and rivers being at capacity, many of these fields will remain flooded for several more days.
click image to zoom Many of the fields that I was able to look at since Monday had soybeans ranging from just emerging to V6. At these early growth stages, soybean plants cannot survive being totally submerged much longer than 24 hours with the hot, sunny weather that we have had since Sunday.
Historically, we have said that planting after June 15 results in a 1 to 2 percent yield loss per day, with the yield loss potential increasing to 2 to 3 percent per day after July 1, and not recommending planting after July 15. However, some new research conducted by Dr. Larry Purcell indicates that this may not be the case. This research will be discussed in more detail below.
For soybean growers that are considering replanting, there are several items that need to be addressed.
Late Season Replant Considerations:
- How long was a field flooded? - Those fields that were only submerged less than 24 hour should be evaluated. If new growth is observed three to four days after the flood water has receded, then these fields may not need to be replanted. Any field submerged more than 24 hours will likely need to be replanted.
- Removal of “old” soybean stands - Many of these flooded fields will possibly need to be reworked prior to replanting. This should remove any surviving soybean plants and any weeds that have emerge after the waters recede. For fields that will not be reworked, consider herbicide options to remove remaining soybean plants and any emerging weeds.
- Weed control - Our recommendations would be to plant a Liberty Link soybean variety. Growers will have more weed control options with the Liberty Link system than with Roundup Ready or conventional systems. Growers should also take into consideration what herbicides and rates have been applied to these fields so far this year. Be sure to not apply rates over the labeled amounts for the season. Also, be sure to look at the Plant-Back Intervals for the herbicides to be used. These can be found in here. Many of the common soybean herbicides have as much as a 10 month plant-back to other commodities, and 10 months from July 15 would be May 15 of the following year.
- Maturity group - Below are Dr. Larry Purcell’s comments on a research project evaluating soybean maturity groups by planting dates. For the past two years, his research indicates that late-MG IV varieties had the highest yield potential planted in July than the other maturity groups evaluated.
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