Allelopathic effect of aqueous extract of Polygonum bistorta and Terminalia chebula on germination and seedling growth of Daucus carota and Medicago polymorpha

Weed management is essential for sustainable crop production in all cropping systems. The use of herbicides causing the problems herbicide resistant weeds and environmental pollution. Plant-released phytotoxins have ability to promote or inhibit germination seedling growth surrounding crops weeds. Therefore, it imperative identify plant species having herbicidal potential as more safe weed approach. present study was planned 2018 investigate Daucus carota Medicago polymorpha influenced by root extract Polygonum bistorta fruit Terminalia chebula. Different concentrations aqueous (0, 2.5, 5, 10, 20, 40 80%) significantly reduced target species. Results these experiments revealed that thefruit T. chebula phytotoxic compared P. regarding weed. However, 80% concentration fully D. M. polymorpha. One bases finding concluded comparatively active substances with suppress plants which could be exploited prospective source bio-herbicides.