MECHANISM AND EFFICACY EVALUATION OF ATMOSPHERIC PRESSURE DBD PLASMA TREATMENT FOR FORAGE GRASS SEEDS

Vollständiger Abstract

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To overcome the problems of low germination rate and irregular emergence caused by dense surface structure, poor water permeability, and dormancy of forage seeds, this study screened the optimal plasma generation mode suitable for continuous treatment of forage seeds under atmospheric pressure and evaluated its efficacy and mechanism. Through a comparative analysis of the uniformity and stability of corona, spark, gliding arc, and dielectric barrier discharge (DBD), the results showed that DBD can generate large-area, low-temperature, and uniform plasma in atmospheric air. Taking Leymus chinensis seeds as the research object, the effects of different treatment voltages (0–16 kV) on the glume microstructure and the electrical conductivity of the leachate were investigated. Scanning electron microscopy (SEM) observations indicated that DBD treatment with appropriate parameters caused significant etching on the seed glume surface, forming micropores and fissures, and removing impurities. The electrical conductivity measurements further revealed a “dosage effect”: moderate voltage helped maintain the integrity of the membrane system, whereas excessive voltage led to severe damage to the glume and leakage of intracellular contents. The study confirmed that atmospheric pressure DBD plasma, through physical etching and surface modification, can effectively improve the water absorption channels and physiological activity of Leymus chinensis seeds, and an optimal parameter window exists. These findings provide a technical basis for the development of continuous plasma seed treatment equipment.