use Encode;
my $data = decode('UTF-8', $IN->param("data"));

##</code><code>##

map { 
	$cat_add->{$_} = encode("UTF-8",$cat_add->{$_} );
} keys %$cat_add;

##</code><code>##

Adding: Agricultura/Fumigación Aérea
$VAR1 = { 'FatherID' => '75321', 'Full_Name_Flat' => 'agricultura/fumigacion aerea', 'Full_Name' => 'Agricultura/Fumigación Aérea', 'Name_English' => 'Aerial fumigation', 'Name' => 'Fumigación Aérea', 'CatDepth' => '0' }; Done...

##</code><code>##

75321 	Agricultura 	0 	0 	0 	Agricultura 							0 	0 	No 	No 	NULL	2012-09-04 03:11:10 	0 			Agriculture 	agricultura
75322 	Fumigación Aérea 	75321 	75321 	1 	Agricultura/Fumigación Aérea 							0 	0 	No 	No 	NULL	2012-09-04 03:11:10 	0 			Aerial fumigation 	agricultura/fumigacion aerea