Study of flora and mapping the distribution of weeds on field chickpea(Cicer arietinum L.) in Khorramabad

This study was conducted to find out the weed floristic composition of 24 chickpea farms in Khorramabad during 2012. Based on a floristic study, 70 weed species belonging to 20 families were identified. The results showed that dicots were predominant in the chickpea farms. Maximum of weed densities were recorded for Gallium tricornutum (10.27 plants.m-2), Vaccaria grandiflora (4.3) and Vicia villosa (3.4) plants.m-2respectively. Maximum frequency of different weed species was recorded as G. tricornutum (93.8%), V. garndiflora, and C. dichotomum with frequency of 75%, and 59.4% respectively were the two others prevalent species. Carthamus oxyacantha, and Centaurea spp. With frequency of 56%, and Conringia orientalis, Vicia villosa, and Sinapis arvensis by frequency of more than 50% were the others prevalent weed species. Plant families of caryophyllaceae, compositae, and brassicacea any with two species, and rubiacea, and fabaceae families any with one species included the 8 species with frequency more than 50%. Among 30 species with frequency more than 10% only 4 species were biennial or perennial, that is 83.3% of weed species that had frequency more than 10% was annual. Of the total weed is detected (64 spacies , 75/92 % ) were C3, and (5 species , 25/7 %) had C4 photosynthetic pathway.