Study the effects phytotoxines of aqueous extracts of rice plant residues ageinst of germination and growth of wheat.

Abstract

ABSTRACT: A biotic activity affected of rice residues on wheat an experiment was conducted in a Faculty of Education for Girls/ Kufa university .Laboratories to test the effect of allelopathic compounds released from rice residues on wheat plant, and determine whether the reduction in growth of wheat crop rotation was due to toxicity of rice residues.Results showed that the residues of rice significantly reduced vegetative and root growth .also, Aqueous extracts of rice significantly reduced seed germination and seedling growth of wheat .The toxicity of the residues appeared two weeks after residues decomposition of soil and continue for six weeks.Also results strongly suggest the toxicity effect of rice causative factor responsible of wheat growth reduceduction .