الفهرس 
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Abstract
Two separate pot field experiments were performed on Hymenocallis
speciosa, Salisb and Gerbera jamesonii, L. plants throughout two successive
seasons (2011/ 2012 and 2012/ 2013) at the nursery of Horticulture Research
Institute, Giza, Egypt. First experiment, aimed to study the individual and the
combined effect of different growing media [clay, sandy clay, sandy compost
(2:1, v/v) and sandy sewage sludge (4:1, v/v) media and different irrigation
levels (low, moderate and high according to field capacity of every growing
medium used in every irrigation) on growth, flowering, bulb productivity and
chemical constituents of Hymenocallis speciosa, Salisb. Results indicated that
growing plants in sand/ compost (2:1, v/v) medium with supplying plants the
moderate irrigation level was the best treatment used in improving most plant
traits. Second experiment, was designated for improving plant quality of
Gerbera jamesonii, L. plant by applying some biostimulants of yeast extract at 2
and 4 g/l and garlic extract at 250 and 500 ml/l and organic fertilizer of the
commercial product of actosol. Results proved the superiority of using yeast
extract at 4 g/l for improving most plant parameters.