Document Type : Research Paper
Authors
1 , Research Institutes of Forest and Rangelands
2 -Isfahan Agricultural and Natural Resources Research and Education Center
3 Isfahan Agricultural and Natural Resources Research and Education Center
Abstract
In order to study different methods of soil fertilization in Satureja .khuzistanica a research carried out in Fozveh station of Agricultural and Natural Resource Research Center of Isfahan, during 2016- 2020. The treatments were different levels of chemical fertilizers (N50P25K25), different levels of organic fertilizers (Cow Manure30, Cow Manure60 and 5 ton/ha Vermi-compost) and combination of chemical and organic fertilizers (N50P25K25+ Cow Manure30, N50P25K25+ Cow Manure60, N50P25K25+ 5 ton/ha Vermi-compost). These treatments were compared with the control. The project had 3 replications, according to a randomized complete block design. The percentage of essential oil was measured by water distillation (Clevenger) at 50% flowering stage. The amount of essential oil compounds was evaluated by gas chromatography (GC) and the qualification of essential oil was measured by Gas chromatography-mass spectrometry (GC-MS). According to the results, the maximum essential oil percentage and oil yeild in S. khuzistanica was 3.7% (in the third year) and 132.6 kg/ha (in the second year). Based on the results of the experimental years, the highest oil yield was observed in the combined treatment of 50 kg/ha nitrogen, 25 kg/ha of phosphorus and 25 kg/ha of potas plus 5 tons per hectare of vermicompost, in the third year. During the experimental years, 14 compounds were identified in S. khuzistanica essential oil that major compound was carvacrol (86.4-95.3%). According to the results, the qualitative yield of essential oil of this species was less affected by soil fertility treatments, but the quantitative yield of essential oil had a significant increase that indirectly increases the qualitative yield of essential oil. Finally, it was concluded that intermediate method was the superior treatment in order to improving quantitative yield and can lead to sustainable agriculture.
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