Weeds community structure on the rice field (Oryza sativa L.) in bulusari village, Sayung district, Demak regency

Rice weeds are disturbing plants that grow together with rice and otherwise well- controlled, it will reduce the quantity and quality of crops. The aim of this research is to analyze the community structure of weed rice in 8-week-old. Benefits of this research are expected to provide information about the types of rice weeds and their characteristics. Research was conducted in June 2018 in Bulusari Village, Sayung District, Demak Regency; and Ecology and Biosystematics Laboratory, Biology Departement, Diponegoro University. Method of this research is a random sampling method used a plot sized 1 m x 1 m as many as 18 plots. Results of the research were the highest Important Value Index is Echinochloa colonum (L) Link species and rice weed diversity index is low