
Iowa State Extension researchers linked corn "edge effect" yield losses to micro-climate conditions and hot, dry, windy weather in July and August. Some farmers reported severe losses along field edges, with one field yielding zero on the first combine pass.
Edge losses reduce harvested corn volumes in drought years, adding to the supply effect of weather stress. The finding is mainly agronomic and has limited effect on market prices.
After 445 past neutral weather events, CORN moved a median +0.1% over 5 sessions (52% higher; middle half -1.4% to +1.6%), and +0.7% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.