The simplest way to achieve what you want is to use the special variables $\ and $,:

@field = qw(look at me now);
@field2 = qw(this is so neat);

local($\, $,) = ("\n", "\t");
print @field;    # first row
print @field2;   # second row
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Resulting in:

look    at    me    now
this    is    so    neat
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About your original problem: I think your fields data ends in newlines.