| As a large agricultural country,China is plagued by diseases and pests,among which,the control of underground pests is a prominent problem.The use of high-voltage pulsed electric field insecticide technology to electrically treat the soil,based on bio-electromagnetic properties,causes apoptosis of the cell membranes of pests and achieves the purpose of insecticide.While maintaining the ecological environment,it improves the efficiency of pest control,increases crop yields,and achieves sustainable developmentIn this paper,the influence of various factors in the electrode arrangement on the electric field insecticide technology is studied.Starting from the principle of electric field generation,the analysis shows that the externally applied electric field is mainly affected by the voltage on the applied medium,the shape and size of the electrode,the distance between the anode and cathode,and the distribution of the electrode.Therefore,several electrode arrangements are proposed and ANSYS is used.Maxwell simulation software performs electrostatic field simulation,analyzes the electric field strength and effective area of the electric field,etc.,and proposes suitable electrode layout schemes.The difference in legality of three common soil-borne pests:grubs,ground tigers and mole crickets under different electrical pulse parameters was analyzed to obtain the optimal voltage,frequency,duty cycle and action time parameters for these pests.Then conduct field orthogonal experiments and explore the rules to analyze the relationship between electrode layout,equipment energy consumption,effective area of electrical treatment,and insecticidal effect.The following conclusions were obtained.(1)The electrode with circular cross-section produces the highest maximum electric field intensity.(2)Each configuration has a fixed electrode distance d to maximize its effective area.For the given electrode distance d,the configuration scheme should be selected according to the specific value of d to obtain a larger effective area.(3)The applied electric field is 500V,the hexagonal multi-anode configuration(HC),d=50cm,is the most practical configuration solution.The electric field intensity is concentrated in the central area of the effective area,and its theoretical area=6388cm~2,with the maximum effective area=3105cm~2,the maximum electric field strength=6664.7V/m,although is not 0,but/≤0.05,that is,the invalid area is almost negligible.(4)The electric pulse parameters had an effect on the electroshock lethality of subterranean pests,with the effect of action time and voltage being the most obvious.The lethality of electric shock increased with the increase of voltage and action time.(5)The combined parameters of voltage amplitude,frequency,duty cycle,and treatment time that make the lethality of several pests exceed 90%are obtained.(6)Orthogonal experiments were carried out based on three factors and five levels,and a total of 25 electric field experiments were completed.Three groups of programs with the best insecticidal effect were obtained,that is,the electrodes are arranged in a hexagonal multi-anode solution:d=50cm,voltage amplitude 220V,treatment time4min;d=60cm,voltage amplitude 160V,treatment time 6min d=70cm,voltage amplitude 220V,processing time 10min.The electrode placement scheme and electrical treatment parameters given in this paper are shorter treatment time,lower treatment voltage amplitude,moderate treatment area and high pest legality compared to the current scheme,especially suitable for control of pests in orchards where single fruit trees encounter pests and small crops in arable land are infected with diseases at an early stage of the disease.The depth of electrode insertion allows changing the depth of electrical treatment for better treatment of plant roots.In the actual cultivation and maintenance of plants,it is possible to adjust measures to local conditions,and to select appropriate electrode layout schemes for different pest killing scenarios,so as to improve the efficiency of electrical treatment. |
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