Iron chelates in fertilizer will correct iron deficiency when added to soil. One pound of iron per acre is the recommended rate. An application of iron will only work if the soil is acidic in nature, so a pH test is required.
On Location. Big was filmed on location in New Jersey and New York City. The Baskin House was filmed at, 437 Greenmount Road, Cliffside Park, NJ, USA [Thanks to Dee83] Locations used include Cliffside Park, NJ for young Josh's home and Cliffside Park Elementary School #6 as the school Tom Hanks attended.
King was also disappointed by Kubrick's decision not to film at The Stanley Hotel in Estes Park, Colorado, which inspired the story (a decision Kubrick made since the hotel lacked sufficient snow and electricity).