Effect Allelopathic Plant Competition And Respon To Microba Population In

EFFECT ALLELOPATHIC PLANT COMPETITION AND RESPON TO MICROBA POPULATION In the modern agriculture, allelopathy has a great potential in improving crop productivity, genetic diversity, maintenance of ecosystem stability, nutrient cycling, and nutrient conservation , weed control, disease management and pest control. Allelopathy is chemical interaction between plants that results in either an inhibitory or stimulatory response. Chemical interference is due to one plant releasing secondary chemicals into the environment that subsequently inhibit seed germination or growth of seedling. At low concentrations, allelopathic substances can stimulate germination and growth of target species, but at high concentrations, the allelopathic substance are inhibitory. A number of crops have also been known to exhibit allelopathic property on other crops growing in succession or simultaneously or may even exibit autotoxicity. Some of the higly worked out important crop exhibiting crop autoxicity include Vigna radiata and Mucuna pruriens and few orthers. The residues of Vigna radiata and Mucuna pruriens affect the performance of other crops through the release of allelochemicals. Allelochemicals in the letter may regulate litter decomposition processes and thereby influence nutrient cycling in ecosystems. There for the allelochemical released from one source species may have a proportionally larger effect on nutrient cycling then will litter from other species. Chemical released by soerce plant also could inhibit neighbors by stimulation microba population. Key Words : Allelopathy, microba population, nutien cycling, stability ecosytem.