عنوان مقاله [English]
ABSTRACT An experiment was carried out as a factorial based on completely randomized design in three replication to determinate damages caused by weeds in three different planting dates and identification of dominant weed species in chickpea farms in Kurdistan University Research Farm located in Dehgolan during the cropping year of 2012-13. The three experiment factors were conducted as follows: the first factor, sowing date in three levels of autumn, waiting and spring, the second factor in two levels of weed interference and non-interference and the third factor was chickpea cultivars including ILC482, Azad, Arman, Pirouz and Kaka. Abundance of weed species in autumn sowing was higher than waiting and spring planting. Galium tricornotum, Turgenia latifolia and Geranium tubrosum were dominant species in pea farm. Galium tricornotum and Turgenia latifolia were the most abundant species in autumn sowing. Turgenia latifolia and convolvulus arvensis were the most abundant species in witing and spring planting, respectively. The highest relative density in autumn sowing date was obtained from Turgenia latifolia. Turgenia latifolia had almost 50% of relative importance of all weed species in autumn sowing. Turgenia latifolia, Galium Tricornotum and convolvulus arvensis make it difficult to harvest chickpea because of their morphological characteristics and growth traits. The highest density of weed species was recorded in autumn sowing date. Due to high density of weed species in different plantings, if they were not controlled, remarkable reduction in chickpea yield would be predictable, especially in spring sowing which is faced with moisture deficiency during growth.