بررسي تاثير كودهاي شيميايي ، دامي و تلفيقي بر عملكرد و ميزان تركيبات اسانس دانه گياه دارويي زنيان

Study on the effect of different rates of chemical fertilizer, manure and mixure of them on seed yield and main, compositions of essential oil of Ajowan (Trachyspermum copticum

This experiment was conducted on 2001 and 2002 in research farm of Qazvin Agriculture Research Station in order to study the effect of different rate of nitrogen, phosphorus, manure and mixture of them on seed yield and essential oil content of ajowan {Trachyspermum copticum). The experimental design was randomized complete block with three replications and 12 treatments including: different rates of N and P (as mixture) with 4 levels (conventional system), Different rates of manure with 3 levels (organic system), mixture of N, P and manure with 4 levels (integrated System) and control. The essential oil obtained using water destillition method was also measured. Chemical components of the oil were identified by GC and GC/MS. The results showed that with increasing of N to 90 and P to 60 Kg/ha, seed yield also was increased but had no effect on the essential oil content. With increasing of manure, seed yield and essential oil content were increased. In general integrated treatments in respect of seed yield and essential oil yield were higher than other treatments. With increasing of N to 60 and P to 40 kg/ha and manure to 20 ton/ha, thymol was increased, while p-cymene was decreased. Integrated treatments had the highest essential oil content and thymol.