How wet should corn be at harvest?
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Corn is ready for harvest about 20 days after the silk first appears. At harvest time, the silk turns brown, but the husks are still green. Each stalk should have at least one ear near the top. When conditions are right, you may get another ear lower down on the stalk.
Harvest Loss: The optimum harvest moisture content for corn is approximately 23% to 25%. At this moisture level, kernels shell easily and stalks generally stand better, which can make harvesting more efficient. A normal harvest loss level of a timely and efficient harvest is about 1 to 2%.
We usually have two extremes that drive the question: too wet or too dry. The too wet situation is a harvest timing and storage issue; too dry is more of a harvesting issue. My ideal range is 17% to 23% moisture for harvesting corn. This range is something to shoot for but could be expanded with acreage constraints, timing or storage needs.