Pot culture and field experiment were carried out to understand allelopathic effect of different concentrations of various types of dust of Xanthium indicum L. on the yield and component of yield parameters such as - (a) development of numbers of pods per plant, (b) number of seeds settled per pod, (c) weight of 1000 seeds and (d) seed yield per plant of green gram (Phaseolus radiatus). The experimental findings showed that different concentrations of various types of dust of test weed (5, 10, 15 and 20 %) in pot were influenced significant and caused inhibitory effect on the yield and component of yield parameters of the crop. In case of field experiment ratio of crop plant (C.P.) & Xanthium plant (X.P.) per plot (100:00, 75:25, 50:50 and 75:25) were exhibited negative correlation between increase of test weed population in experimental plot and the yield and component of yield parameters of the crop. The study indicates that the allelochemicals released from the various types of dust into the soil in pot culture experiment and increased weed density of the field were checked or altered the internal metabolic pathways or/and suppressed the regulation and function of phytohormones. Hence, the yield and component of yield parameters of green gram were reduced as per the dose intensity of dust of test weed in pot and density of weed population in the experimental field.
