University of Kirkuk Kirkuk University Journal for Agricultural Sciences (KUJAS) 2221-0482 10 2 2019 06 01 Effect of altitude and nitrogen fertilization on some vegetative and flowering parameters and essential oil percentage of lavender plant (Lavandula angustifolia) 40 47 177823 10.58928/ku19.10205 EN Al-Atrakchii Ammar O. A. University of Mosul - College of Agricultural 2Yousif H. H. University of Dohuk -College of Agricultural 3Amjad O. M. Al-Barwari General Directorate for Agriculture – Dohuk Journal Article 2017 02 09 This study was carried out in the Malta nursery- Dohuk forests and rangelands directorate - Dohuk city, from 15th Mar 2015 to 1st July 2016 to investigation the effect of different levels of altitude (500 m in Malta nursery of Dohuk forests and rangelands directorate and 1000 m in Bagerat village in Zawita District) above mean sea level(AMSL) and nitrogen fertilization (0 , 400 , 600) kg.hectar-1 on some vegetative and flowering parameters and essential oil percentage of lavender Lavandula angustifolia Mill.. Results showed that increase the altitude from 500m to 1000m led to significantly decreased in the plant high, branches number, length of inflorescence, number of inflorescence and inflorescence dry weight. While the levels of nitrogen fertilizer caused a significant affected in most traits, especially at level of 600 kg.ha-1 which significantly increased the plant high, branches number, length of inflorescence and significantly decreasing in the length of inflorescence, inflorescence dry weight and volatile oil percentage https://kujas.uokirkuk.edu.iq/article_177823_86e198345ff9cdabded921b319ee8cb0.pdf