Effects of different sources of nitrogen fertilizer and applied rates on essential oil content and composition of peppermints Journal title: Journal of Herbal Drugs Authors: Adel Poshtdar; Alireza Abdali Mashhadi; Foad Moradi; Seyed Ata Siadat; Abdolmehdi Bakhshandeh Subject(s): Medicine, Agricultural Science, Biotechnology, Botany, Genetics, Plant Sciences, Marketing, Pharmacology, Toxicology