Synopsis Average self‐fertility of 437 alfalfa plants was 0.75 seeds per flower tripped. One generation of selfing has resulted in an average loss of 80 to 90% in self‐fertility and 20 to 30% in vegetative vigor. In a study of 8 clones, loss in vigor was greater from the S1 to S2 generation than from the S0 to S1 generation. The vegetatively‐propagated clone appeared to be the most satisfactory parental base from which to estimate inbreeding depression.
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C. P. Wilsie (1958) studied this question.