اثرالگوهاي تك كشتي و توالي گياهان زراعي بر تنوع جوامع علفهاي هرز

The Effect of Mono and Sequence Cropping Systems on Diversity of Weed Community

In order to study the effect of different crop sequences on weed community diversity, a field experiment was conducted in the educational field of Ramin (Molasani) Agricultural Faculty in the subcounty of Ahvaz. The experimental design was RCB with crop sequence factor in 5 levels and 3 replications. The results show that weed communities are affected by crop sequence factor. Therefore, weed dry weight and density changes depend on crop type and crop temporal arrangement. Both previous and present crops had the main role on the determination of the quantity of weed dry weight and density. Broadleaf weeds were the most dominatied form of weed communities and this group increased by an increase in broadleaf crops. At least, this research has shown that mono cropping system has had a lower weed than some sequence cropping systems. Margalefʹs species richness index (DMG) was the best criteria for the comparison of weed diversity among cropping sequences.