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Synopsis In 15 experiments, yield reductions of soybeans in weed‐infested plantings averaged 3.7 bushels per acre or approximately 10% of weed‐free beans when weeds were grown the entire season. Foxtail reduced bean yields slightly less than smartweed or velvet leaf. Dry matter yield of above ground parts of soybeans and weeds combined approximated that of weed‐free beans alone. Effects of rainfall are discussed. Possible effects of uncontrolled factors are recognized.

Synopsis Growth of annual weeds increased markedly and bean yield reductions became more severe with soybean stands of less than 9 to 11 plants per foot of row. Bean yield reductions were more severe when weeds were left until or after stage 7 (early August). With moderate weed infestations and moisture deficits during the growing season, soybean yield reductions were less than with adequate moisture. Foxtail and smartweed infestations reduced bean yields about equally. Dry matter yields of above‐ground plant parts of soybeans and weeds together were slightly higher than that of weed‐free beans.