Assessing weeds distribution in rainfed wheat farms of Ilam

In order to compare the weed flora and determine the abundance and distribution of weed species in dryland wheat fields, a study was conducted in Ilam province in the spring of 2014. Sampling weeds in wheat farms of 50 ha at the tillering stage of wheat was done. After monitoring the wheat fields of Ilam, 51 weed species were observed in no control conditions and 27 weed species in control conditions, which the results showed that narrow leaves were more abundant compared to the broad-leaved weeds in the studied fields. Winter wild oat with frequency 38.5 and wild barley with frequency 30.5 were most important of narrow leave weed, and London rocket with frequency 37 and Canada thistle with frequency 33 were most important of broad leave weeds in wheat farms of Ilam. Also the species of bermudagrass, shortspike canarygrass, annual bluegrass, cypress spurge With C4 photosynthetic pathway and the remaining monitored plants have been C3 photosynthetic pathway. Finally, it was observed that the Ilam farms have been highest diversity index of Shannon-Wiener (2.52) and Rika had the lowest rate Shannon-Wiener diversity index (1.81). In control conditions, areas with higher diversity index had most uniformity and species richness index. The areas with higher diversity index had a higher species abundance and richness.