Seven varieties of Lolium perenne were used as testing materials and adopted PEG-6000 osmotic stress to evaluate the drought resistance in the germination period of the seeds; using drought stress in pot, in order to study different spraying concentrations treatment of paclobutrazol with the root development status and physiological reaction changes of Lolium perenne. Aiming to explore the most suitable presoaking and spraying concentration to improve the drought resistance in the germination and growing pe...