Effects oOf Different Levels Of Vermicompost On Growth Indices And Essential Oils Essential Oil Of Peppermint (Mentha piperita L.) Under Uifferent Irrigation Regimes

Management of soil nutrients using organic fertilizers is among major pillars of sustainable agriculture. This experiment was conducted to evaluate the effects of different levels of vermicompost and irrigation regimes as factorial completely randomized design with three replications at Zabol university greenhouse. Treatments included irrigation at 100 (Control), 75 and 50% FC and application of humic acid at 0, 20 and 40% of pot volume. The greatest and the least plant height, internode length, fresh and dry weight of plants, stem diameter, number of tillers per plant, dry and fresh weight of roots per plant was observed at irrigation at 90% FC and 50% FC, respectively. Whilst, the greatest essential oil percentage was achieved in irrigation at 50% FC. Cultivated plant at 40% volume of pot vermicompost had the greatest growth components and essential oil percentage. Interaction of 40% volume of pot vermicompost and irrigation at 90% FC had the greatest plant height, internodelength, plant dry weight, root dry and fresh weight. Mean while application of 40% volume of pot vermicompost and irrigation at 50% FC had the greatest essential oil percentage. The interaction was not significant for plant fresh weight, stem diameter and number of branch per plant .These results suggested that application of 40% volume of pot vermicompost in free drought stress conditions had the greatest growth components and at 50% FC had the greatest essential oil percentage in peppermint