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Published online 1 April 1956
Published in Agron J 48:157-160 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Hardening Behavior of Sweetclover (Melilotus Spp.) Varieties in a Subarctic Environment1

H. J. Hodgson and R. J. Bula2

Synopsis: Eleven sweetclover varieties were evaluated for winter survival, carbohydrate reserves, trends of cold resistance development, and nitrogen content of root tissue. Arctic, Brandon dwarf, Erector, and Alpha were the only varieties to give any appreciable winter survival. Carbohydrate reserves were adequate in all varieties. Arctic, Brandon dwarf, and Erector showed significantly higher cold resistance and content of various nitrogen fractions. The possible role of various nitrogen fractions in cold resistance development is discussed. Water soluble protein appeared most closely associated with cold resistance.

1 Contribution from the Agronomy Department, Alaska Agr. Exp. Sta., Palmer, Alaska. Published with approval of Director, Alaska Agr. Exp. Sta.

2 Head, Agronomy Department and Agronomist respectively, Alaska Agr. Exp. Sta. The junior author is now Agronomist. Purdue University, Lafayette, Ind.

Received for publication November 18, 1955.




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Copyright © 1956 by the American Society of Agronomy.