Most of Iowa alfalfa fields have broken winter dormancy. A few early April nights with temperatures in the low 20 degrees F or below will pose a risk of cold injury to alfalfa and other forage species. Low temperatures, whether visible frost is present or not, may affect the growth of both established forage plants and newly emerged seedlings.
Iowa State University
Barnhart, Stephen K., "Cold Injury to Alfalfa and Forage Crops" (2009). Integrated Crop Management News. 690.
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