Abstract
Pot trail were carried out at greenhouse of National Research Centre, Dokki, Egypt, to evaluate the effect of different irrigation intervals 5,10 and 15 days combined with two exposure time of He-Ne laser rays (0 and 5 min.) on the growth, oil yield and fatty acids constituents of Ricinus communis. Plant height, Stem diameter, leaves number leaf area, fresh and dry of leaves weight, as well as relative water content and osmotic potential (atm) were decreased by prolonging irrigation intervals. Carbohydrates % also showed a negative response by extending irrigation intervals. Helium neon (He-Ne) laser rays improved Caster bean growth and decreased osmotic potential followed by increasing relative water content and help plants to complete its life cycle. Palmitic acid is substantial component of the saturated fatty acids, while ricinoleic unsaturated fatty acids is the major one. The highest increment in both ricinoleic and hexacenoic acids was recorded by prolonging irrigation interval up to 10 days.
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