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Joanne Rathe/Globe Staff
David Johnson and Kate Morkeski loaded a device that feeds fertilizer into the salt marsh on Plum Island.
For the study, researchers hauled a ton of fertilizer to the salt marsh every four days or so in the spring and summer.
David Johnson checked the tank where water is mixed with fertilizer and released during the rising tide.
David Johnson offloaded fertilizer from a boat onto a station in the marsh.
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