3 Unexpected Ways Your Corn Loses Moisture

Holly Thrasher

Sep 17, 2019

As fall approaches, farmers across the corn belt are anxiously awaiting the start of harvest. But you may be asking yourself, “Is my corn crop dry enough to be taken out of the field?”

A handful of factors influence corn grain moisture, and being mindful of them can help guide your schedule of harvest activities.

Above all else, remember that the first step toward corn maturity and subsequent drydown is reaching black layer.

A good rule of thumb is that kernels will reach maximum dry matter, or starch, accumulation 55-65 days after silking, at which point the hard starch layer has advanced all the way down the kernel. As each kernel reaches black layer, its life cycle effectively ends and it will no longer receive—or need, for that matter—nutrients and moisture from the cob.

Kernel moisture typically ranges from 30-35 percent at the onset of black layer. Corn harvested at 24 percent moisture or greater is commonly referred to as high moisture corn and is an excellent option for feeding livestock. If you don’t have a market for high moisture corn, however, you’ll want to optimize field drydown to reduce your drying costs.

Moisture drydown after black layer is due entirely to evaporative loss, and it stems from both environmental and hybrid-dependent factors.

Weather plays a significant role in your drydown rate.

If the weather is warm with low humidity, the evaporation of kernel moisture will be faster and you will reach a lower grain moisture sooner than if it’s cooler and with higher levels of humidity.

There is no set drydown rate. Research by R.L. Nielsen summarized that drydown rates can range from 0.4-0.8 percent per day (with daily extremes as high as one percent and as low as zero drydown). That means it could easily take 15-30 days to see field drydown from 30 percent moisture to 18 percent moisture.

In addition to weather, a few plant characteristics influence how quickly a kernel loses moisture.

  • Husks impact the rate at which moisture evaporates from the ear. For example, husks that are looser or have a shorter husk coverage of ear will allow for faster drydown. If the husks scenesce, or die, more quickly they will also allow for a quicker evaporation of moisture from kernels.

  • The angle of the ear will also affect drydown rate. As ears decline, or drop from an upright position, moisture will be removed from grain more quickly and there is less chance of rain collecting in husks.

  • The relative maturity (RM) of your corn is the third factor contributing to how quickly it will be ready to harvest. Since there is no standard RM assignment to hybrids across seed companies, using the growing degree units to silk stage or black layer provided for your specific hybrids—taken into account with the above factors—can provide a better roadmap to when you may potentially be ready for harvest.

Want to know more? Reach out to one of our FBN agronomists with any questions you have as corn harvest approaches.





Holly Thrasher

Sep 17, 2019