Plant sulfur isotopic compositions are altered by marine fertilizers

This study presents sulfur isotope compositions (δ34S) for plants grown in a series of growth chamber and field experiments under controlled conditions. Maize, beans, and squash fertilized with a marine fertilizer (seabird guano) were significantly enriched in 34S relative to the unfertilized control plants (by +4.0 to +7.2‰) in the growth chamber experiments. No 34S enrichment was detected in the plants from the field experiment, which likely...