Abstract
SynopsisSevering 12‐week old Vernal alfalfa tap roots 5½ inches below the soil surface resulted in a significant increase in the number and total dry weight of lateral roots over 1 mm. in diameter on the upper 4 inches of tap root as counted when plants were 18 weeks old. Severing the tap root had no effect on dry weight of topgrowth or upper tap root nor on diameter of tap root. The significance of these results to studies of frost heaving of plants is discussed.
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