Ultrasonic Irradiation Promotes The Germination Mechanism Of Mung Bean Seeds

China,as one of the most abundant resources of plant species in the world,has never stopped studying botany.How to shorten the germination time,improve the survival rate and sustain the rare species resources has become an important and serious problem.Ultrasound as one of the alternating stresses,that impacts on plant has been studied continually.The experimental results showed that appropriate ultrasonic radiation on plant seeds shorten the germination period,increased the survival rate,moreover,it improved the quality of the plant seeds and increase production.Ultrasonic frequency,intensity and duration are the major factors which effect the growth of plants.The parameters of the ultrasonic radiation may be different because the plants vary widely.So,the establishment of the theoretical model of irradiation parameters on plant seeds under the irradiation remains to be further researched.This paper established the physical theory model under the low intensity ultrasound,based on the microscopic structure of mung bean seeds.The small deformation theory of tension was used.The expression of the rectangular and circular membrane was derived when the dependent variable was less than 15%.Then,combing the forced vibration theory of the membrane,the relationship between tension and frequency was simulated by MATLAB.Therefore,the experiment of the mung bean seeds radiated by the single and dual frequency ultrasound was designed.Through the germination rate,germination index,germination speed and comparison the growth and development of mung bean,we obtained the more appropriate ultrasonic parameters and verified the theoretical model.The main conclusions can be drawn in this paper:1.Based on the microscopic structure of mung bean seed cells,using the small deformation theory of tension,the physics model of rectangular and circular membrane was established,when the dependent variable ?<15%,the expressions of rectangular and circular membrane tension could be concluded.2.According to the circular and rectangular physics model,which established by the forced vibration theory of the membrane,the relationship between membrane tension and the thin film can be stimulated by MATLAB.3.The experiment was designed based on the calculated results of the resonant frequency theory.Mung bean is radiated by a single frequency of ultrasound,with different stimulated frequency,power and treatment time.Through the statistics and calculation of mung bean seeds germination rate,germination index and germination speed to determine the most optimum parameters of single frequency ultrasonic effect on mung bean seeds.4.Based on the resonant frequency of the vibrated membrane and the experiment results derived from the single frequency ultrasonic radiation,we designed the different intensity,irradiation time and processing time interval under the dual-frequency stimulation.Though the comparison of the germination index,we concluded that the germination of mung bean have a better results under the combined ultrasonic radiation.