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weed flora and diversity of rice agro-ecosystems in visakhapatnam district of Andhra Pradesh, India

Author: 
Nagaraju, N., Bandaru V. Rao, Tarakeswara Naidu, M. and Srinivasa Rao, D.
Subject Area: 
Life Sciences
Abstract: 

The study was conducted to assess the phytosociological studies of weed species in rice fields of Visakhapatnam District, Andhra Pradesh. The survey has been carried out at 100 randomly selected rice fields and well explored covering all the geographical areas of Visakhapatnam district, to identify the weed flora, species composition, density, frequency and importance values index (IVI). A total of 80 plant species, belonging to 75 genera and 29 families were identified. Among the 29 families have been recorded, out of these 16 families are representing each species. Poaceae is the largest family representing 15 species. The results of phytosociological studies revealed that the species Bacopa monnieri (4.2) is most abundant weed in rice field followed by Ammania baccifera (4.0), Chromolaena odorata (3.2), Merremia gangetica (3.1) and Marsilea quadrifolia (2.8), these five species were concluded as the most competent weeds which enter into real competition with the rice crop.

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