THE POPULATION GENETIC STRUCTURE OF AMBROSIA TRIFIDA IN DIFFERENT ENVIRONMENT Allelopathy of plant volatile monoterpenes mediated by soil: a case study of Ambrosia trifida L. Effects of light intensity on the phenotypic plasticity of invasive species Ambrosia trifida. EFECT OF Ambrosia trifida ON ROOT GROWTH AND NODULATION OF SOYBEAN Allelopathic Research of Ambrosia trifida