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by Jeremy Ross, Professor and Extension Agronomist - Soybeans - June 11, 2021
With the exceptional rainfall we have had over the past two weeks, especially in southern Arkansas, I have had numerous calls asking how flooding will affect a soybean plant. The answer to this question is, it depends. There are several factors that will determine if a soybean plant will survive flooded conditions. These factors include plant growth stage, duration of the flood, depth of the flood, clarity of the water, movement of the water, air temperature, and amount of sunlight. There could be additional factors, but the bottom line is, the longer plants are in submerged conditions the less likely they will survive. As a rule, soybean plants in submerged conditions over 48 hours will begin to stress and die. At this point, early estimates for the southeastern portion of Arkansas that had the most flooding is 20% or greater of the soybean acreage will be affected. Many of these acres will be replanted, and below are my recommendations to consider for late-planted soybean.
Use seed treatments to prevent soil insect/disease damage, and reduce the likelihood of a replant situation. Data shows a yield advantage with these seed treatments on the extremes of the planting window, and we are at the end of the planting window.
Previous research has shown a significant yield increase with the use of soybean inoculants, even where soybeans have been grown in the past. Data from a multi-year evaluation of inoculants and planting dates show a soybean grain yield increase of 6 and 11 bu/ac with June and July planting dates, respectively. Several inoculant products were tested, and all preformed equally. When treating seed with inoculants, ensure that the inoculant product has not expired, check inoculant label for recommended insecticide/fungicide seed treatments, and do no use chlorinated water for seed treatment slurry.
Scout field often prior to and during reproduction. Corn earworms and stinkbugs could be a huge problem on late planted soybeans. Try and plant soybean varieties with good disease packages. Strobilurin- resistant Frogeye leaf spot has been reported in Arkansas, and combination products will need to be applied to control this disease.