Phytosociological Studies on Some Species of Senna With Special Reference to Impact on Parthenium Hysterophorous L.

Present study deals with the analysis of different parameters of phytosociology in Senna Mill, dominating phytocommunity. Phytosociological observations were made for the community where herbaceous species of Senna (S. tora (L.) Roxb, S. obtusifolia (L.) Irwin & Barneby, S. occidentalis (L.) Roxb. and S. alata (L.) Roxb.), were growing abundantly. The frequency, density, abundance, dominance, Importance Value Index (IVI) were determined. It was analyzed from the quantitative study that the greater area of vegetation is occupied by Cynodon dactylon (L.) Pers. followed by S. occidentalis and S. tora. S. tora and S. occidentalis impose synergistic biochemical and elemental allelopathic impact on the population of obnoxious weed Parthenium hysterophorous L. Thus these Senna speceis may offer potential alternative tool for the control of Parthenium population in India.