Effect Of Different Plant Growth Accelerators On Seed Germination And Seedling Growth Of Shrubs Used In Spraying

To slove the problem of competition between shrub and herbal appearing after spraying seeds in Beijing highway slopes,and to promote shrub’ s relative competiti’veness compared to hurb,the way that using plant growth accelerators and hot water to immerse shrub seeds was tried to promote germination and seedling growth.Three experiments which were indoor germination test,indoor seeding test and outdoor sparying test were carried out,and the data was analysed by SPSS and R,to obtain the better soaking time,the better initial temperature of hot water and better concentration of plant growth accelerators.The results show that:(l)The better soaking time was 12 hours in the case of immersing in plant growth accelerators.(2)The better concentration of plant growth accelerator was gibberellin-100mg/L or NAA-10-8mg·L-1,,which had promoting effect to all three kinds of shrub seeds(3)The suitable initial temperature of hot water for Amorpha fruticosa L.was 60-70℃ and 60-80℃for Lespedeza bicolor.And hot water had inhibiting effect to Vitex negundo var.heterophylla.(4)When mixing shrub and herbal seeds,the better plant growth accelerator solution is gibberellin-100mg·L-1.The conclusions shows that when spraying shrub and herbal seeds,shrubseeds which have hard nature could soaked in 60-70℃ of hot water for 2 hours and then soaked in plant growth accelerators(gibberellin-100mg·L-1)for 10 hours would stimulate germination of shrub seeds’ germination and seedling growth,and for the seeds which do not have hard nature could be directly soaked in plant growth accelerators(gibberellin-100 mg·L-1)for 12 hours.The combined methods of soaking seeds are innovative and feasible and could be used in seeds pretreatment before sparying project.