الفهرس 
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Abstract
The present study was conducted during the two successive seasons of 2017 and 2018 at the Nursery of Horticulture Research Station in Mansoura, Egypt to study the influence of some bio-stimulants i.e. humic acid as a soil drench around the plants, salicylic acid and chitosan as foliar spraying on some vegetative growth parameters and chemical constituents of Catharanthus roseus and Duranta plumieri plants.
The obtained results can be summarized as follows: all treatments increased all vegetative growth parameters and chemical constituents in both seasons compared with the control. Treatments of chitosan at the rates of 300 and 200 mg/l, gave the highest records of both vegetative parameters and chemical constituents of both plants in the two seasons.
Humic acid at the rate of 6 ml/l and salicylic acid at the rate of 200 mg/l recorded the next significant values of plant height, number of branches/ plant, fresh and dry weights per plant, leaf area, root length, fresh and dry weight/ root, N, P and K percentages and chlorophyll a and b content in the two plants during both seasons.