تاثير تنش كم آبي و نيتروژن بر خصوصيات رشدي و عملكرد گياه دارويي هميشه بهار (Calendula officinalis L)

Effects of water deficit stress and application of nitrogen on yeld and growth characteristics of Calendula (Calendula officinalis L.)

The effects of water deficit stress and nitrogen were studied on yield and vegetative characteristics of Calendula (Calendula officinalis L.). An experiment was conducted at Research Field of Islamic Azad University of Takestan branch in 2006. Field experiment was carried out by a split plot design based on completely randomized block design with 4 replications, treatments were three levels of stress as irrigation after 40, 80 and 120 mm water evaporation from evaporation pan, and consumption of 0, 30, 60 and 90 kg/ha nitrogen. The results indicated that water deficit stress had significant effect on plant and main stem height, number of lateral stem, flower weight to plant dry ratio, petal weight to flower dry ratio and flower yield (pDO.Ol). The plants had the highest main stem height, number of lateral stem, flower weight to plant dry ratio, petal weight to flower dry ratio and flower yield (2406 kg/ha) when irrigation after 40 mm evaporation from pan class A. Nitrogen had significant effect on plant and main stem height, number of lateral stem and flower yield. The highest plant height, main stem height, number of lateral stem and flower yield (1546kg/ha) were got by applying of 90 kg/ha nitrogen. Irrigation and nitrogen interactions effect were significant in lateral stem number and flower yield. It seems, applging of Nitrogen fertilization had not significant effect on morphological characteristics on Calendula in water deficit stress.