evaluation of nutrients of thyme in response to fertilizer sources and different irrigation regimes

Drought is one of the most important environmental stresses that in addition to affecting a wide range of morphological, physiological and biochemical characteristics of plants, will also cause plant nutrition disorders. since the biosynthesis and improvement of essential oil content of medicinal plants as one of the most important goals of their cultivation is affected by environmental factors such as water deficit stress and nutritional stress conditions. in this regard, three years split plot study were done as a randomized complete block design with three replications in urmia university at the 2014-2017 cropping years. the main factors include irrigation regimes in three levels {normal irrigation (once every two weeks as control), supplementary irrigation (once a month) and rainfed conditions (without irrigation)}, and the sub-factor at six levels included fertilizer resources {biofertilizer (azotobaror 1 + phosphate-barvar 2), complete chemical fertilizer and complete nano fertilizer with and without vermicompost. sampling and analysis of traits were done in the cropping year 2016-2017 (third year of planting). the interaction results of irrigation regime with fertilizer sources showed that low irrigation conditions lead to decreasing concentrations of nitrogen, phosphorus, potassium and copper, and increasing concentrations of iron, zinc and essential oil yield, as well as reducing total dry weight. according to the results, the concentration of manganese in the supplementary irrigation conditions decreased and then increased again with increasing stress intensity in rainfed conditions. combined application of nano fertilizer with vermicompost under normal irrigation conditions, and application of nano fertilizer in supplementary and rainfed irrigation conditions led to improved essential oil yield. in general, the improvement of essential oil yield in water deficit stress, during the application of nano fertilizer, indicates the efficiency of this fertilizer in providing nutrients and achieving sustainable agricultural goals.