Fall rainfall is good for wheat and next year’s crops, but it does have its drawbacks. One challenge is rain’s impact on corn stalk quality. More in a moment. Rain in the fall usually is welcomed despite the delays it causes with crop harvest. Pastures and alfalfa benefit from extra growth and winterizing capabilities. Wheat and other small grains
get well established as do any new fields of alfalfa or pasture. And the reserve moisture stored in the soil will get good use during next year’s growing season.
But rain also reduces the feed value of corn stalks in fields already combined, and even on standing stalks. And this fall many fields have had some pretty heavy rain on those stalks. Rain reduces corn stalk quality several ways. Most easily noticed
is how fast stalks get soiled or trampled into the ground when fields are
muddy. Less noticeable are nutritional changes. Heavy rain soaks into dry
corn stalk residue and leaches out some of the soluble nutrients. Most serious is the loss of sugars and other energy-dense nutrients, which lowers the TDN or energy value of the stalks. These same nutrients also disappear if stalks begin to mold or rot in the field or especially in the bale. Then palatability and intake also decline.
There is little you can do to prevent these losses. What you can do, though, is begin to supplement a little earlier than usual. Since weathering by rain reduces TDN more than it reduces protein, consider the energy value of your supplements as well as protein content. Weathered corn stalks still are economical feeds. Just supplement them accordingly.