در شرايط گلخانه AMARANTHUS RETROFLEXUS و تاج خروس ريشه قرمز GLYCINE MAX ارزيابي رقابت نسبي ارقام سويا

Evaluation of competetiveness of soybean (Glycine max)cultivars and redroot pigweed (Amaranthus retroflexus) in greenhouse

Relative competetive ability of 3 soybean cultivars (Willims,Clarck and I-Iobit) and redroot pigweed were assessed during entire growing season by using replacement series experiments .Decreasing the proportion of plant density resulted in increasing relative yield (RY) of soybean cultivars.Competition within species was higher than competition among species. Relative yield of redroot pigweed was less than soybean cultivars due to higher inter- specific competition rather than infra- specific competition. Relative yield total more than 1 indicates niche differentiation between soybean and redroot pigweed. Also relative crowding coefficients (RCC) for soybean cultivars higher than unit , indicates higher inter specific competitive cultivars than potential redroot pigweed. Aggressivity (A) index in soybean cultivars were higher than redroot pigweed . However, in Hobit aggressivily was less than other cultivars.