Dry Matter and Essential Oil Yield Changes of Lavandula officinalis under Cowmanure and Vermicompost Application

In order to study the effect of organic fertilizer on shoot yield and essential oil content of lavender, this experiment was conducted in the Research Institute of Forest and Rangelands, Karaj, Iran, in ۲۰۱۳-۱۴. The treatment groups consisted of vermicompost (۰, ۵, ۱۰ and ۱۵ ton/ha) and cow manure (۰, ۱۰, ۲۰ and ۳۰ ton/ha). The experimental design was a factorial experiment based on randomized complete block design (RCBD) with three replications. The resultsshowed that cow manureapplication significantly affected big and smallcanopy diameter, canopy perimeter, lateral stems number and woody stem yield (P≤۰.۰۱). Moreover, manure significantly affected main stem diameter and leaf yield (P≤۰.۰۵). Results indicated that vermicompost application significantly affected big and smallcanopy diameter, annual stem number, leaf yield, annual stem yield, woody stem yield, total biological yield, essential oil yield (P≤ ۰/۰۱), and main stem (P≤ ۰/۰۵). According to the results, the interaction effect of treatments was significant for total shoot and leaf yield (P≤ ۰/۰۵). The highest sub stem number (۲۴ n/p) was obtainedin ۳۰ ton/ha manure treatment. While, the highest leaf yield (۲۲۰۶.۴ kg/ha), annual stem yield (۷۱۳۳.۲ kg/ha), annual branches yield (۹۹۳۳/۶ kg/ha), total biological yield (۱۳۳۳.۶ kg/ha) and essential oil yield (۸۲.۶۷ kg/ha) were determined at ۱۵ ton/have vermicompost treatment. These fertilizers can improve tiller number and lateral stems growth but not affect essential oil percent and yield. It seems that they can increase it in drought stress condition because of improving soil moisture and fertility.

کلیدواژه ها:

Lavander (Lavandula officinalis) ، Cowmanure ، Vermicompost ، essential oil ، Dry matter yield