ارزيابي پويايي جمعيت علفهاي هرز در نظامهاي زراعي متداول و اكولوژيك در تناوبهاي زراعي مختلف

Weed dynamic of conventional and ecological cropping systems in different rotation

Weed population dynamics in corn, sugar beet and wheat plots in rotation with wheat were studied under conventional and ecological management systems during 2 years. The experiment was carried out as a split- plot design based on complete randomized block. Where 3 crop rotations were assigned to main plots and 5 cropping systems including high-input, medium-input, low-input, integrated and organic systems were allocated to subplots. The results showed that crop species and weed management practices in different cropping systems influenced weed population dynamics. However, weed population dynamics was indirectly affected by crop rotation. Weed density was significantly higher in organic and medium-input compared to other systems. The lowest weed population density and diversity was observed in high-input system. In the second year of experiment, while crops were changed in rotation, difference in weed density was the same as the first year in different cropping systems but species composition varied depending on crop species.