Evaluation of some of competitiveness indexes in competition between cotton varieties and common cocklebur (Xanthium strumarium L.)

Abstract:In order to examine the competitive strength of cotton varieties experimental farm in 2010 in a factorial randomized complete block design was in 3 replication that consisting of 12 variety and three density levels (0,2,4 of plant-1) common cocklebur weed (Xanthium strumarium L.) was in conditions of farm. With this aim, for competitive potency, the two indices were used; AW (Ability with stand competition) and Cl (Competition index). Results showed that the index of AW is the ability to better estimate the competitive power. And there are varieties that have the greatest value AW, lowest yield in terms of varieties compete with weeds are than to Conditions of weeds free.