Effect of High Voltage Electrostatic Field(HVEF) on the Physiological Indexes of Cucumber Seed during Germination Period Effects of high voltage electrostatic fields on protective enzyme activity in wheat plants and on the population dynamics of Sitobion avenae fabricius (hemiptera:aphididae) Effect of high-voltage electrostatic field (HVEF) on the growth and fecundity of Sitobion avenae Fabricius (Hemiptera: Aphididae) Compound Processing Effects of HVEF and Low Energy N+ Ion on Streptomyces Aureofaciens