بررسي تاثير تراكم بوته و كود نيتروژنه بر عملكرد بذر و ميزان ماده موثره گياه دارويي ماريتيغال (Silybum marianum)

Study on effect of plant density and nitrogen fertilizer on seed yield and active substance of Milk thistle (Silybum marianum (L) Gaertn)

To sludy the effect of plant density and N-fertili/er on seed and active substance yield an experiment was conducted in spring of 2005 at research station of Hammand Absard in Damavand .The treatments were plant spacing in 3 levels (50x20, 50x30. 50x40 cm) and N- fertili/er in 4 levels (0. 50. 100. 150kg/ha) .During ontogenesis, the growth and development in each treatment were recovered and after collecting and drying the fruits, seed yield and silymarin percentage was measured. The results show that increasing N-fertilizer and plant density has a positive effect on seed yield, although the seed yield of each plant was decreased by increasing the plant spacing. The percent of effective substance of seed (Silymarin) didnʹt show any difference in plant density but in 0 kg N/ha. the active substance was higher than another plant which received difference levels of N-fertilizer. althought finally highest yield of silymarin was obtained in plant with highest density which received highest level of N-fertilizer