Content and composition of essential oil in lemon balm (Lippia alba (Mill) N.E.Br.) grown with ammonium and nitrate in light environments Dahkki Lima, Janderson Do Carmo, Santos, Anacleto Ranulfo Dos, Soua, Aline Dos Anjos, Santos, Marcelo Batista Dos, Alves, Pericles Barreto