A PHYTOSOCIOLOGICAL SURVEY ON WEED FLORA ANDDIVERSITY IN RICE FIELDS OF CHIDAMBARAM BLOCK, T.N.,INDIAM. Vikram Sai, G. Murugan, M. Saravana Perumal and C. Kathiravelu
A phytosociological survey was carried out to assess the varied weed flora and diversity in rice fields ofChidambaram block, Tamil Nadu, India. Chidambaram lies in low land habitat and the climate is subtropical.An average annual rainfall varies between 1200 to 1500 mm. The study has been done during 2020, Navaraiseason to determine the weed flora, species composition, density, frequency and important value index(IVI). To project the types of weed sps that are mainly affected the low land rice ecosystems. A total of 4sedges, 3 grasses, 8 broad leaved weeds and 1 aquatic weed were detected. Sedges are most prominentweed flora found in the rice fields of Chidambaram block. The findings indicated that Cyperus difformis, Echinochloacolonum are the most abundant weeds in rice field followed by Cyperus rotundus, Echinochloacrusgalli, Leptonchloa chinensis, Eclipta alba and Sphenocleazelyancia.