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    Fertilizer harming Plum Island salt marsh, study finds

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    • David Johnson and Kate Morkeski loaded a device that feeds fertilizer into the salt marsh on Plum Island.
      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.
      Joanne Rathe/Globe Staff
      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.
      Joanne Rathe/Globe Staff
      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.
      Joanne Rathe/Globe Staff
      David Johnson offloaded fertilizer from a boat onto a station in the marsh.
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