اثر تراکم بوته بر عملکرد و اجزای عملکرد بادرنجبویه (Melissa officinalis)

For 2000 years, balm has been used to cure many diseases and its essential oil has anti bacterial, anti fungal and anti hormonal activities. In an experiment in Karaj during two years different plant densities of Melissa officinalis of 10, 6.7, 5, 4 and 3.3 plant/m2 were investigated in complete block design with three replications. In this research, yield of dry matter, essential oil percentage and essential oil yield investigated. The results indicated not significant difference between plant densities in dry matter and there was significant dirrerence between years in in dry matter. There was significant difference between essential oil yield of Melissa officinalis in the years. In the first year, the yield of essential oil for treatments of 10, 6.7, 5, 4 and 3.3 plant/m2 were 944, 1127, 1157, 1205 and 1102 g/ha, respectively. in the second year, the yield of essential oil for treatments of 10, 6.7, 5, 4 plant/m2 were 1771, 1876, 2113, 2096 and 1832 g/ha. Average essential oil yield of years were significant difference and average yield of essential oil yield in the first year was 1107 g/ha and in the second year was 1938g/ha. the result indicated that essential oil percentage and essential oil yield in the second year were more than of first year.