الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A set of experiments were conducted in the farm of Modem Agricultural Development Company (Dina-80 km north west Cairo ) during 1990 I 1991 and 1991 I 1992 seasons to investigate the response of cultivated milk thistle (Silybum marianum (1.) Gaertn )to row spacing and nitrogen and phosphorus fertilization, in addition to diagnose the allelopathic effects of silybum seeds and roots on germination and seedling development of certain crops.
Height, number of leaves and heads I plant, dry weight of leaves and stem I plant and seed and oil yield parameters of silybum indicate that the rates of 50 kg N/fed and 30 kg P20s/fed are sufficient to meet the nitrogenous and phosphorus requirements with no extra benefit to any further increase in N and P rates.
Widening spacing between rows from 45cm to 60cm decreased significantly seed yield/fed. in the two successive seasons by 29.1 and
27.7 %, respectively and reduced also their oil yield by 24.3 and 27.7%
for the same respective seasons.
Concentration and yield of silymarin group (the active constituents of silybum seeds) generally increased with application of 50 kg N/fed. and 60 kg P20s/fed. to the plants grown in narrow row spacing.
Head circumference and weight, seed weight/head and seed oil percentage showed an increase with progress of the head in age up to 12 days for head circumference and weight, and to 16 days for seed weight.
Germination %, germination rate and seedling growth assessments of crops were varied in their response to the allelopathic activity of aqueous exudates of silybum seeds and roots. seeds exudate was more harmful than root exudate. Among maize, rosell barley, pea and fennel, squash seems to be the most susceptible crop. Whereas, radical and plumule lengths of germinated crop seeds were the most sensitive traits to the allelopathic activity of silybum