After the slowest start to planting since 2013, farmers across the Midwest found a window to plant last week. However, farmers in the northern Corn Belt are still struggling, and it’s a race against the calendar.

IN-DEPTH MARKET ANALYSIS: Wednesday was a risk-off day in the agricultural commodity markets.

U.S. wheat futures fell sharply on Wednesday following a report about efforts by the United Nations to restore Ukraine grain shipments along with news of potential Russian wheat exports.

Corn futures fell sharply, erasing gains posted early this week, as spillover from a selloff in the wheat market and prospects for a resumption of grain shipments out of Ukraine sparked active profit-taking.

Wet fields have slowed farmers’ planting progress to a snail’s pace in some states, but that’s had little effect on broadleaf weeds and grasses. Many are growing rapidly in parts of the Midwest.

Kansas City wheat scored record highs on Tuesday, exceeding the highs set in 2008.