A Burrus Seeds representative says soybeans that have
reached R7 are generally safe from frost damage.
Josh Gunther is their Product Lead serving Illinois, Missouri and southern Wisconsin. He tells Brownfield frost has negative yield impacts on R6 soybeans and below.
“Because the seed isn’t fully finished inside those pods yet and if we have a killing frost that damages those leaves, we don’t have the photosynthesis to come through and finish filling those out.
Continue reading Seed rep says frost can impact yields of soybeans before R7 at Brownfield Ag News.