Study of competition ability of amaranth (Amaranthus spp.) and mung bean (Vigna radiata L.) in intercropping system by using competition indices

In order to study the competition ability of amaranth and mungbean in fodder intercropping system under different crop residue management، a field experiment was conducted at two seasons (first planting of wheat and then intercropping management) in Agricultural Faculty of Shahid Chamran University of Ahvaz during growing season of 2010-2011. The experimental design was split plot based on randomized complete block design with three replications. Three crop residue managements were in main plot and five planting ratios were in sub-plot. Eight indices of the competition abilities were measured. The results showed that the highest intercropping fodder yield (1347. 6 g. m-2) and LER (1. 27) were obtained in residue incorporated and 50% planting ratio of each crop. Residue burning increased variation of CR، reduced RLO and RCI and also، had the highest RYL. In higher planting ratio، the aggrissivity of amaranth was more than mung bean. In treatments with highest forage yield، amaranth and mungbean were dominant and non-dominant crops، respectively. In conclusion، amaranth was more influenced by residue management methods and planting ratios than mung bean and also، its competition ability had more variation in compared by mung bean.