| Sumario: | Several tests were made in Pergamino, Argentina, from 1962 to 1966, to determine the degree of natural crossing in soybean (Glycine max L.). The varieties used in the study were “Hill”, “Hale 71”, “Hale 321”, and “Domar”, with “Lee” as the pollinizing variety because it has dominant characters that are easy to detect. The rate of cross-pollination was very low. The different tests averaged from 0 to 0.79 percent of natural crossing, depending on the variety, method and date of sowing, and the year of planting. It is thought that Thrips tabaci Lind, which was observed in the soybean flowers, may be responsible for these crosses.
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