Soybean Flowering Fallacy

Shawn P. Conley, Extension Soybean and Small Grains Agronomist, University of Wisconsin-Madison

In a bean pod…

  • There is an old rule-of-thumb that soybean does not flower until after the summer solstice — the longest day of the year occurring on June 21st in the Northern Hemisphere — yet many of us have seen soybean flower much earlier.
  • Early planted soybean experience shorter days before June 21st, so floral induction and the subsequent appearance of flowers may occur ahead of the summer solstice.
  • Soybean management decisions depend on proper identification of reproductive stage R1 (1st flower), which means relying on scouting to observe flowers, not calendar date.

To read this full article, click here.

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