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Weeds account for losses in crop yields, and this event might be exacerbated by salinity. Therefore, we investigated the responses of <i>Chenopodium album</i> L. and soybean (<i>Glycine max</i> (L.) Merr.) to salt stress, as well as interferences between species. Ten-day old plants were grown for 1 week in a single- or mixed-species set-up, either with or without 100 mM of NaCl. <i>C. album</i> reduced the biomass of soybean similarly to salt stress, while its growth was unaffected under any condition. <i>C. album</i> decreased the crop protein content when salinity was applied. This effect was ascribed to altered protein metabolism and/or N usage to produce other N metabolites, including osmolytes. The two species did not reciprocally affect the capacity to accumulate Na⁺, but the weed contained two-fold more Na⁺ in the leaves. Elevated initial K⁺ concentration and high K⁺ delivery to the shoot likely explained the better acclimation of <i>C. album</i> to salinity. <i>C. album</i> produced more phenolics and proline and exhibited greater antioxidant activity, but low lipid peroxidation, in the mixed set-up under salinity. Thus, it is possible that the weed could become more resilient to salinity when growing in a soybean field. In the long term, this might cause significant losses in soybean productivity as expected by the dramatic decline in crop protein content.