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.
The scenes in Josh's neighborhood were filmed in Cliffside Park, New Jersey. The amusement park scene in the beginning of the movie where the wish was made was filmed at Ross Dock Picnic Area on the Hudson in Fort Lee. It is not an amusement park but was set up as one. The George Washington Bridge can be seen clearly in some of the shots.