Considering that an estimated 50% of the total corn plant yield remains in the field after harvest, those acres harvested for corn can represent a potential forage source that is often overlooked, says Rory Lewandowski, an Ohio State University Extension agricultural and natural resources educator says.
That is significant, because the drought of 2012 has been one of the worst on record, leaving many livestock producers short on hay and silage. The lack of substantial rainfall, extreme heat and dryness left many producers looking for any alternative forage supplies.
"This corn residue is out there and sometimes not utilized at all," Lewandowski says, calling it an "overlooked resource that, especially in this type of year, can be a significant benefit for producers."
While most of the harvest residue is the stalk, there are also leaves, husks, some corn grain and cobs that remain, with the amount of corn grain left on the field averaging some three bushels per acre, he says.
"Drought-stressed corn often yields more grain in harvest residue because some of the stressed stalks are susceptible to breaking, lodging and dropping ears, leaving more stalks and ears that don't pass through combine," Lewandowski says.
Often, post-harvest residue is left on cropland simply because the farmer doesn't raise livestock. Those who do raise livestock might not consider it because cornfields typically aren't fenced.
"By using an electrical fence, the livestock folks can let their cows graze harvested corn fields," Lewandowski says. "It allows you to make use of some of these unused resources like corn stalks without having to invest a lot of time or money."
Other tips to consider when using harvest residue as a potential forage supply:
* Grazing, rather than baling, typically provides the best utilization of corn residue, with the best use gained when livestock graze the field as soon after harvest as possible.
* Corn stalks and corn residue don't provide nutrients adequate for high production livestock such as dairy cows, young growing livestock or lactating beef cattle, sheep or goats. But it does well for dry cows, ewes or does that may be in early to mid-gestation.
* Baling may be an acceptable option if particle length is reduced by chopping stalks before baling, which can increase forage utilization.
* Growers can also use the corn residue as an ensiled product, wrapping bales in plastic, with corn residue at a moisture level of around 60%. It may be possible to push the moisture content to 55%, but the risk of poor fermentation increases with drier material.