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Delta Farm Press
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.