Document Type : Research Paper

Authors

• somayeh Karamichameh ¹
• ehsan zidali ²
• sayed timori ¹
• shida timori ¹

¹ PhD student, Department of Agriculture and Plant Breeding, Faculty of Agriculture, Ilam University, Iran

² Department of Agriculture and Plant Breeding, Faculty of Agriculture, Ilam University, Iran

Abstract

Introduction: Identification of weeds in wheat fields is considered the most basic measure in weed management. By knowing the specific weed flora in a region, it is possible to plan about their management methods. In order to further identify and compare the weed flora of dryland wheat fields in the tropical cities of Kermanshah province, a study was conducted in 1400-1401.
 
Methodology: Weed sampling was done on 60 hectares of dryland wheat fields in the studied cities during the tillering stage of wheat. The number of selected farms was evaluated based on the area under dryland wheat cultivation in each city. Based on the control and non-control of weeds in the wheat fields, these areas were divided into two groups. Types of weeds were identified by gender and species. In order to determine the importance of the monitored weed species in the fields of the region, the indices of abundance of species, distribution uniformity, relative density of species, and relative importance of species as well as indices of diversity and dominance were used.
 
Research findings: After monitoring the wheat fields, 20 types of weeds were observed in the conditions of no weed control and in the control conditions, and the narrow-leaf weeds were more abundant than the broad-leaves. In the absence of control, wild winter oats (Avena ludoviciana) with a frequency of 38% and oat (Hordeum spontaneum) with a frequency of 30% are the most important weeds and mustard (Sinapis arvensis) with a frequency of 40% and anemone with a frequency of 30% are the most important weeds. In the conditions of weed control, the winter wild oat plant had the highest abundance of 21%. The results of the study showed that the use of herbicides reduced the Shannon-Wiener diversity and weed species richness and on the other hand increased the Simpson''''s dominance index. In the condition of no control, farms in Gilanghreb city had the highest Shannon-Wiener diversity index (2.32) and Qasrshirin city had the lowest Shannon-Wiener diversity index (2.07) compared to other reging. In the control conditions, the Shannon-Wiener diversity index was close to each other in different areas, and its highest value was 0.6. The areas that had a higher diversity index had a higher species richness index and a lower dominance.

Keywords

• Monitoring؛ Species diversity
• Predominance؛ Species abundance
• Shannon-Weiner

Main Subjects

• Crops under rainfed cultivation