Recurrent Selection for Yield in Soybeans

How to Cite

Fehr, W. R., & Ortiz, L. B. (1975). Recurrent Selection for Yield in Soybeans. The Journal of Agriculture of the University of Puerto Rico, 59(3), 222–232.


Procedures have been developed for yield testing of soybeans (Glycine max (L.) Merr.) that permit S1 testing with 1 year per cycle and S4 testing with 2 years per cycle. The principal factors in the program include efficient procedures for obtaining crossed seed by hand pollination, crossing and generation advance in Puerto Rico, and yield tests in Iowa by use of hill plots. Details for each of the three factors are discussed. With the facilities available, expected genetic gain per year for yield was calculated for S1 testing without male sterility (S1), S1 testing with male sterility S1(ST), Stesting without male sterility (S4), and half-sib family selection with male sterility (HF). The greatest expected gain per year was obtained with S1 testing. There is more genetic variability among S4 lines than among S1 lines due to inbreeding, but expected genetic gain is less for S4 testing because 2 years are required per cycle. S1(ST) had less expected gain per year than S1 or S4 testing because 2 years are required per cycle if homozygous male-fertile genotypes are evaluated. Expected genetic gain was least for HF because less genetic variability is expressed among lines than for the other three methods.


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