Saturday, 15 July 2006

Effect of solid nitrogen application on biological yield, essential oil percentage and essential oil yield of balm (Melissa officinalis L.) under greenhouse condition.

bohloul Abbaszadeh1, ebrahim Sharifi ashourabadi1, mohammad reza Ardakani2, farzad Paknejhad3, davood Habibi3, and mojtaba Adraki3. (1) research institute of forests and rangelands, tehran, Iran, (2) nuclear research center for agriculture and medicine-atomic energy organization of iran, karaj/rejaii shahr/nuclear research center for agriculture and medicine, tehran/karaj, Iran, (3) islamic azad university-karaj branch, karaj, Iran

Abstract: In order to investigate the effect of nitrogen fertilizer on biological yield of Balm(Melissa officinalis L.) an experiment was conducted under greenhouse condition at Research Institute of Forests and Rangelands Karaj/ Iran in 2004. The research was carried out with 6 levels of nitrogen fertilizer with 60, 90, 120, 150 and 180 kg N/ha and control ( without nitrogen). Statistical design was completely randomized design. Units of 15 pots were used per treatment. The nitrogen amount of the levels was added in 3 equal portions to the soil of pots. Results showed that effect of different levels of nitrogen on biological yield was significant in 90 kgN/ha treatment with 135.8 g dry weight per plant. Average production relative to other treatments had a significant difference. Reduction of yield at levels 120, 150 and 180 kg/ ha could be explained by the Mitcherlich law. High application in chemical fertilizer demolishes soil physical, chemical and biological properties. The optimal application of chemical fertilizers in plant production is a suitable approach in sustainable agriculture. Also results showed that highest essential oil percentage and highest essential yield respectively with .25% and 16.05 kg essence/ha were related to the 60kg N/ha treatment which were significant different from the control. Keywords: Balm(Melissa officinalis L.), nitrogen fertilizer, biological yield, essential oil

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