Document Type : Research Paper
Authors
1 MSc. Graduate, Islamic Azad University, Karaj Branch, Iran
2 Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran
3 Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran
Abstract
In order to study the biomass yield in flowering stage and morphological traits in
Mentha spp., 17 accessions of M. pulegium L. and 8 accessions of M. mozaffariani Jamzad were assessed in a field experiment over two years in the Alborz research station, Karaj Iran. The accessions were planted using a complete randomized blocks design in two replications. Each plot contained 15 spaced plants with 0.5 m intervals and 75 cm between rows. The drip irrigation system was used. Data were collected for fresh and dry matter yield over two years and plant height, stem number, number of flowers per plant, the canopy area, and flower length for one year. Data were analyzed, and species means were compared based on DMRT Method. The results showed significant difference between the species for all traits except dry matter yield (P<0.01). In comparisons between species, M. pulegium had higher values of all traits except flower length than that for M. mozaffariani. For fresh yield, M. pulegium with an average value of 183 g/plant had significantly higher production as compared with M. mozaffariani with an average value of 147 g/plant. There were significant differences among accessions for all traits in both species (P<0.01). In comparisons among the accessions of M. pulegium, the accessions Rafsanjan (23031) and Maryvan (22607) with the average of 252 and 231 g/plant had higher fresh yield over two years, respectively. For dry mater yield, Rafsanjan (23031) and Arak (22381) with average values of 115 and 111 g/plant had higher dry matter production, respectively. In comparisons among the accessions of M. mozaffariani, Urmia (19625) with average values of 202 and 98 g/plant had higher fresh and dry matter production, respectively. For essential oil percentage, there were no significant differences between two species; however, there was a significant difference for oil yield. M. pulegium with an average value of 1.14 g/plant had higher oil production than that for M. mozaffariani with an average value of 0.76 g/plant.
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