Protect Alfalfa Stands With Smart Pre-Winter Practices

By Scout Nelson

As temperatures cool and the growing season ends, alfalfa producers should begin preparing fields for winter. Proper fall management plays a key role in winter survival, spring regrowth, and next season’s forage production.

One of the main goals of fall management is to help plants build energy reserves in their crowns and roots before dormancy. These reserves are essential for winter survival and support vigorous growth when temperatures warm in the spring.

The timing of the final harvest is especially important. Producers should evaluate current regrowth and the expected timing of the first killing frost before deciding whether to take an additional cutting.

Experts recommend allowing five to six weeks between the last harvest and the first killing frost so plants can replenish carbohydrate reserves. Harvesting too late may reduce winter hardiness and increase the risk of stand damage.

Weather conditions should also be monitored closely. While frost occurs below 32°F, a killing frost usually requires temperatures below 24°F for several hours and can influence plant survival.

Stand health and field conditions can also affect winter performance. Newly established stands, older fields, poor drainage, low fertility, and previous winter injury can all increase the risk of winter damage.

Snow cover can help insulate alfalfa crowns from extreme cold. Maintaining a stubble height of 4 to 6 inches may improve snow retention, while prolonged ice cover can increase the risk of plant injury.

Producers are encouraged to evaluate field conditions before winter and make management decisions accordingly. Entering winter with healthy plants and adequate root reserves remains the best strategy for reducing winterkill and promoting strong spring growth.

Fall management is ultimately an investment in next year’s crop. Careful planning can improve stand longevity, forage yields, and overall field productivity.

Recommendations

• Allow alfalfa plants to build carbohydrate reserves in their crowns and roots before winter to support survival and spring regrowth.
• Time the final harvest carefully and avoid late-season cutting that can reduce winter hardiness.
• Leave at least five to six weeks between the last harvest and the first killing frost whenever possible.
• Monitor local weather forecasts and frost conditions to make informed harvest and management decisions.
• Pay close attention to stand health, drainage, soil fertility, and fields with a history of winter injury.

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