Effect of Different Levels of Stress and Vermicompost Fertilizer on yield, yield component and active compound of Allicin in garlic Medicinal Herbs

Garlic (Allium Sativum L.) is a herbaceous herbaceous plant of the Liliaceae family which has been ranked second in the world in terms of production of onions after onions. Due to lack of water resources, saving and optimizing water use is inevitable. Generally, the highest yield and water use efficiency are achieved in full irrigation and mild stress, respectively. And with the use of organic fertilizers such as vermicompost, the negative effects of water stresses are reduced. Considering the importance of applying water stress in irrigation programs and increasing the amount of effective material of plants by applying stress, this study investigated the effects of different levels of stress and vermicompost on yield, yield components and active compound of Allicin in garlic herb which is the second highest among the onion plants.
The experiment was carried out in a split plot design in a randomized complete block design with three replications at the Research Farm of Torbat Hadiriyah University during the cropping season of 2015-2016. Different irrigation levels including 100 (control), 120, 80 and 60% of water requirement were considered as the main factor and vermicompost fertilizer at four levels of 0, 5, 10 and 15 ton / ha as sub factor.
The results showed that simple and cross effects of drought stress and vermicompost on plant height, leaf length, fresh and dry weight of the plant, fresh and dry weight of the tuber, fresh and dry weight of root, leaf area, leaf dry weight and garlic yield were significant. The results show that with increasing drought stress, plant height, dry weight of bulb and leaf area decreased. Consumption of 5, 10 and 15 tons of vermicompost increased 25, 18 and 10 percent of garlic yield, respectively. The highest and lowest yield of garlic was obtained in 100% water requirement and 5 ton per hectare of vermicompost (with a yield of 10170 kg ha-1) and 60% water stress without vermicompost consumption (with a yield of 3048 kg ha-1), respectively. Drought stress reduced and vermicompost increased the amount of allicin.
Garlic is susceptible to drought stress and Water scarcity decreases and application of vermicompost fertilizer improves its performance. The application of vermicompost while improving the growth characteristics, yield and yield components of garlic and reducing the damage caused by drought stress during the cultivated season, the continuation of plant performance improvement in subsequent years, as well as the improvement of soil physical and chemical properties.