Allelopathic effect of Croton bonplandianum bail. on growth and development of rice (Oryza sativa L.)

Aqueous plant extracts of Croton bonplandianum Bail. was evaluated  for their allelopathic effect on  growth and  developmental changes of two rice cultivars(BPT-5204 and IR-20). The plant extracts was applied at 5, 5, 10, 15,20 and 25% concentrations on the seeds of rice cultivars to understand the germination, growth and pigment changes by conducting pot culture experiments. The experimental results revealed that the seed germination, shoot length, chlorophyll, carotenoids contents were gradually declined with increasing the concentrations of plant extracts.  The higher level of germination and growth reduction was noticed in BPT-5204 than IR-20.