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Alfalfa is a high value crop in southwest Kansas and is produced on about 220,000 acres. Approximately 50,000 of these acres are rotated to some other crop each year. The roots of alfalfa varieties have been reported to produce differing amounts of saponin, medicarpin, and phenolics, all water-soluble toxic materials that can inhibit growth of the succeeding crop. Although toxicity is less of a concern when seeding grasses into alfalfa than when reseeding alfalfa, it might affect wheat establishment and production, and variety differences have not been evaluated. The objective of this study was to evaluate currently utilized alfalfa varieties and identify those with an unusually large undesirable toxic influence upon the following crop of wheat.

Effects of Alfalfa on Wheat Establishment (2001)