Evaluation of Abundance and Preparation of Dominant Weeds Distribution Map in Irrigated and Rain fed Wheat Fields of East Azerbaijan Province, Iran

Due to the large diversity of weeds in irrigated and rain fed wheat fields in East Azerbaijan province, Determining dominant specific weeds and prepare their distribution map, wheat fields were survey based on identical approach. During 9 years (from 2000 to 2009), in 231 wheat fields based on their sizes from 19 counties were selected and abundance of weed species were studied. The results showed that there were more than 112 and 137 species of weeds in irrigated and rain fed field belonging to 101 genera of 28 families. The most important dominant broad leaf weeds in rain fed and irrigated fields were: Galium tricornatum, Chenopodium album, Descurania Sophia, Polygonium aviculare, Geranium tuberosum, Goldbachia laevigata. Grass leaves weeds are Eremopyrum bonaepartis, Alopecurus myosuroides, Bromus tectorum. In addition weed genuses like Acroptilon repens, convolvulus arvensis, Salsola kali, cardaria draba, Lactuca serriola, arethemost prevalent weeds at harvesting time in the wheat fields of province. The results also showed that controlling measures of weeds in wheat fields of province is not satisfactory and their management methods prior to harvesting are even worse.