اثر تاريخچه كشت بر خصوصيات اكولوژيكي - زراعي اكوسيستم گندم مطالعه موردي مزارع آموزشي - توليدي مجتمع كشاورزي رامين (ملاثاني )

Effects of Cropping History on Agroecological Parameters of Wheat Ecosystems

In order to study the effects of cropping history on agronomic, biologic and chemical factors of wheat ecosystem, this experiment was conducted in the farms of Ramin (Molasani) agricultural faculty. Experimental design was RCD with rotation treatment in 6 levels. Evaluation and sampling of data were based on GIS method. The results shown that rotation and monocropping systems had different effects on agroecosystems. Legume crops had both nitrogen and non-nitrogen beneficial effects. Nonlegume crop sequences also had a positive effect on wheat yield but legume crop affects were higher than non-legume crops. Cropping history and previous crop had a significant effect on wheat grain and straw yield. Wheat grain yield was only yield component that was not affected by rotation systems. Both weed density and dry weight were higher in monocropping wheat than rotational one. Effects of crop sequence on SAR and soil organic matter was higher than other soil parameters. Based on the result of this research it can be concluded that non-scientific rotations could be an important biological stress.