Source: University of Missouri

First freeze of the fall ends the growing season for crops, but extended cool weather before the freeze may have stopped crop maturity early, said a University of Missouri Extension agronomist.

"The science of low temperatures and photosynthesis is not perfect, but we expect some reduced yields in both soybean and corn fields because of unusual fall weather," said Bill Wiebold, MU Extension soybean and corn specialist.

When temperatures fall below 40 degrees, little growth occurs. Photosynthesis slows and then stops with low temperatures and reduced day length. Photosynthesis is the chemical process in which chlorophyll in plants converts carbon dioxide and water into starches and sugars for seed fill.

Original press release