Abstract
Rice-wheat is the dominant cropping system in Patna district where wheat is generally grown in winter season and a large area is sown by using seed drill machines. The present investigation is based on the study of biodiversity of weeds under zero tilled condition in Patna district of Bihar. The weed inventory surveys and phytosociological studies in wheat fields were conducted during 2016-19 to identify the weed flora composition, density, frequency and Importance value index of 30 major weed species in wheat. In the study, Asteraceae was found as the largest family in respect of weed species whereas Poaceae and Leguminosaefamilystood at the second position in terms of weed species. Phytosociological studies further revealed that Phalaris minor (6.48) and Cynodon dactylon (5.03) have larger relative frequency among other weed species while Chenopodiumalbum(5.18)and Avena fatua(4.44)have larger relative abundance in the study area. Studies on relative density of weeds revealed that densities of Phalaris minor (7.06) and Chenopodium album (5.65) were higher over other weed species and similar trends were also observed in respect of Importance value index of weeds. Therefore, while planning effective weed management strategy, these two weeds (P. minor and C. album) must be focused. The study will provide an appraisal of species through quantitative characters and will allow effective weed management decision.
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