Harvesting Corn at Higher Moisture Can Preserve Yields, Say Iowa State Agronomists
Conventional wisdom has long said that harvesting corn at 15% moisture is ideal—but Iowa State University agronomists say it may be time to rethink that standard. Their recent studies suggest that 20–22% moisture may actually be the sweet spot for corn harvest, offering both yield and cost advantages.
“Iowa State University agronomists say 15 percent moisture has been the magic number in corn for decades but 20-22 percent really is a sweet spot.”
As corn dries down in the field, it becomes more brittle, increasing the risk of kernel loss during harvest.
“Their studies show drier corn can lose kernels as the ear hits the deck plate in the combine and they say every two kernels per square foot lost equals one bushel per acre.”
That kernel loss adds up quickly, especially in larger fields. By harvesting earlier at slightly higher moisture levels, producers can avoid these losses and protect yield potential.
Beyond kernel loss, agronomists also point to declining stalk quality as another risk when waiting too long into the season.
“In addition, agronomists say stock quality is reduced later in the season.”
Corn Market Update
On the trading front, December corn is now testing the lower boundary of its recent three-week price range.
“December corn testing the lower end of the recent three-week range. A drop below 4.15 makes 4.10 next in our view. Buyers stepping in though at that level.”
Analysts are watching closely to see whether prices will find support or continue to trend lower as harvest progresses.
Soybean Market Snapshot
Meanwhile, the soybean market saw a notable shift this week as managed money traders took a bearish stance across the board.
“Managed money traders are now short soybeans, meal and oil. First time that’s happened in over four months.”
This development marks a significant change in sentiment for soybeans and related markets, potentially signaling lower prices ahead.
With corn harvest decisions impacting both yield and profit, farmers may want to revisit moisture targets—and keep an eye on shifting market dynamics for corn and soybeans this fall.
Audio Reporting by Mark Oppold for Southeast AgNet.