Allelopathic effect of jatropha (Jatropha curcas) on chilli (Capsicum annum) and green gram (Vigna radiata)

Experiments were carried out to determine the possible allelopathic effects of jatropha (Jatropha curcas) on chilli (Capsicum annum) and green gram (Vigna radiata). Aqueous extract of jatropha leaf at 5%, 10%, 15% and 20% (W/V) concentrations were bio-assayed against germination and seedling growth of chilli and green gram. In both crops, germination percentage, germination index, plumule and radicle length, fresh and dry weight of plumule and radicle were appreciably reduced by aqueous extract of jatropha leaf in a concentration dependent manner.