Phytosociology of the weeds of black-mustard, gram and wheat fields.
The phytosociology of weeds in black mustard (Brassica nigra), gram (chickpea, Cicer arietinum) and wheat fields was studied in two agricultural farms near Alwar, Rajasthan, India. The data obtained indicated that weeds were almost absent in the mustard field while a large number of weeds infested wheat and chickpea. Chenopodium album and Melilotus indica were dominant weeds in both the crops. However, the density and biomass per plant of most of the weeds was higher in wheat than in the chickpea fields.