كليدواژه :
Fecundity , كشاورزي , دانه خردل وحشي , گندم , Reproductive Effort , بذر گندم , Wheat , كود نيتروژن , Wild mustard , plant competition
چكيده لاتين :
In order to evaluate wild mustard potential seed production in monoculture and reproductive response of this weed to wheat seed rate and nitrogen fertilizer, an experiment was conducted in 2000-2001 at Agricultural Research Station Ferdowsi-of Mashhad University, Iran. The experimental design was a factorial split-plot with three replications. The experiment had three factors: Three levels of wheat seed rate (175, 215 and 225 kg/ha), two levels of nitrogen rate at optimum and upper optimum rate of wheat (150, and 225 kg N/ha), and four levels of wild mustard density (0, low, medium, and high). Increasing seeding rates of wheat, from 175 to 215, and 255 kg/ha , reduced wild mustard seed production per plant by 62, 66 and 71 % respectively , compared to its monoculture yield. Increasing in wheat seed rate from 175 to 255 kg/ha, in optimum rate of nitrogen, reduced wild mustard seed production at high density by 40 "/o, while in upper optimum nitrogen rate , seed production was reduced only 1 1%. High seed production of wild mustard (21-941 million seed/ha) in the presence of wheat competition indicated that if weed management programs is neglected for one year, soil seed richness would be established for several years.
