crontab and perl script

I have a perl script that runs totally fine if I login as its owner but when I set it up to run in cron tab, it fails.
It seems ENVIRONMENT VARIABLES is different when cron runs the script.
.profile does not run when scripts runs in crontab.
I am not sure if this is a unix question or perl question but anyway I am posting it here.

here is my perl script although I don't think is needed. In .profile there is one a line that runs another file and I explicitly included in the code but still does not work.(`. /usr/oracle/OPROD/8.1.7/OPROD.env`)

#!/usr/perl5/bin/perl

sub trim {
 my $string = shift(@_);
 $string =~ s/\s//g;
 return $string;
};
`. /usr/oracle/OPROD/8.1.7/OPROD.env`;
$MO=`date +%m`;
$DAY=`date +%e`;
$YR=`date +%Y`;
$HH=`date +%HH`;
$date="$MO-$DAY-$YR-$HH";
$date=trim($date);
$cmd="/usr/oracle/OPROD/8.1.7/bin/exp userid=system/dont*know owner=hrsys compress=y";
$cmd = "$cmd log=exp_hrsys.log file=/apsun02/usr1/home/hrsys/exp_hrsys_$date";
`$cmd`;
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prokniAsked:
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arjanhCommented:
The following should work instead of the last line:

`. /usr/oracle/OPROD/8.1.7/OPROD.env; $cmd`;
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prokniAuthor Commented:
Then for each command that I want to run I have to setup my environment variables right befroe running the command!
is there any way to compile .profile in the beginnig of teh code and run other commands after that.
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arjanhCommented:
Nope. A child shell process is started with the default settings (so without loading the profile) for each command between backticks. So consecutive commands each get a fresh shell, without a history of previously executed commands.
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prokniAuthor Commented:
Great info. Really really appreciated it.
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