Effect of regulated deficit irrigation (RDI) on quantitative and qualitative traits of peppermint (mentha piperita l.)
میانگین امتیاز کاربران 5
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زمینه :روشهای آبیاری
محل انتشار مقاله :همایش / کنگره داخلی
نام نشریه :کنگره ملی گیاهان دارویی
Regulated Deficit Irrigation (RDI) is the strategy of reducing irrigation rates, during a specific period of growth and development, with the objective of conserving water and managing plant growth while maintaining or improving yield and quality . To investigate the effect of regulated deficit irrigation on quantitative and qualitative traits of peppermint medicinal plant, the experiment conducted in four replicates in field of Sari Agricultural Science and Natural Resources University. In this experiment, the effect of irrigation in 5 level T1 (100%, Control), T2 (85%), T3 (70%), T4 (55%) and T5 (40%) of field capacity on traits such as Foliage and leaves yield and amount and percentage of essential oil of peppermint were studied. Time- domain Reflectometry (TDR) method, used to calculate water requirement in control treatment. Irrigation was performed separately for each of the treatments and the volume of water delivered to each treatment was measured by the volumetric flow meters. Plants were harvested in mid- flowering stage. The essential oil was extracted by steam distillation method and Clevenger apparatus. Results showed that with increasing drought stress, yield declined significantly. The highest yield achieved in the control treatment (T1) at a rate of 1942 kilograms per hectare. As a result of drought stress up to 55% of field capacity (T4), did not observed significant differences in yield. Essential oil percentage in 70% (T3) and 55% (T4) of field capacity, significantly increased. The highest essential oil percentage observed in 70% (T3) of field capacity by as much as 1.67%. Despite the high essential oil percentage in mentioned treatments, with increasing stress and decreasing leaves yield as a major source of essential oil, there was no significant difference in essential oil yield. The results showed that for production of Peppermint medicinal plant for using foliage or essential oil, mild drought stress up to 55% of field capacity (T4) can be used.