ABSTRACT
The field work was carried out at El Qantara Research Station,
Desert Research Center, North Sinai Governorate through the two
successive seasons , 2016-2017 and 2017-2018. A split-plot design with
three replicates as statistical design was used. on geranium (Pelargonium
graveolens) to investigate the effect of three irrigation levels (10, 15 and
20 m3/fed)throw trickle irrigation system and spraying with salicylic acid
in four concentrations; (0 , 25 , 50 and 75 mg/l);and their interactions on
actual evapotranspiration , WUE, herb fresh weight/plant (g), herb fresh
weight /fed (kg), essential oil percentage in the fresh herb, essential oil
yield ml/plant, essential oil yield l/fed.-l and essential oil chemical
analyses for two successive seasons. Results showed that, the
significantly highest for all parameters were obtained when irrigation by
20 m3/fed, combined with foliar spray with salicylic acid at 75 mg/l
followed by15 m3/fed, combined with foliar sprays with salicylic acid at
75 mg/l . Meanwhile, the significantly lowest values for all parameters
were detected by the treatment of irrigation by 10 m3/fed, without foliar
spray with salicylic acid; (The control treatment). Chemical composition
of volatile oils showed that both of geraniol and citronellol were the
principal components of the oil.