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Sypnosis: Through one cycle of selection for shattering resistance, seed pod dehiscence was reduced 17%. A laboratory method of screening trefoil pods for shattering resistance was repeatable as indicated by a correlation coefficient of 0.992 expressing the relationship between shattering percentages of seed pods collected from diallel cross progenies on two dates. Exposure of seed pods to a relative humidity of 35% for 72 hours was necessary to differentiate the degree of resistance to shattering.
2 Formerly Research Associate in Agronomy (Farm Crops), Iowa State College, now Assistant Agronomist, Florida Agr. Exp. Sta., Leesburg, Fla., and Professor of Agronomy (Farm Crops), Iowa State College, respectively.
Received for publication February 7, 1956.
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