Soybean Harvest Aids
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Except when they have large stems, dead weeds usually cause only minor harvest problems. But unfortunately, only a hard frost will stop the growth and dry up some weeds. However, the average date of the first hard frost in most parts of Missouri is relatively late compared to the average date of soybean maturity and harvest (Figures 1 and 2). Delaying harvest until after a hard frost could result in shattering losses, further delays due to wet weather, delayed wheat planting, and delayed fall tillage. Weed problems could also be more serious in following years because of the extra time weed seeds have to reach maturity.
Archive version. For the most recent information see extension.missouri.edu.