Simulations and Experiments of Soil Temperature Distribution after 2.45 GHz Long-Term Microwave Treatment

Soil disinfection is an important agronomic measure to prevent soil-borne diseases, insects, weeds and other hazards. Based on the premise of being environmentally friendly, microwave soil can improve crop yield quality in a pollution-free, residue-free green way. The law heating theoretical basis disinfection. Therefore, this paper, loess North China black Northeast are used as test materials explore under action microwaves. First, COMSOL Multiphysics software was simulate temperature field change microwave-irradiated soil, simulation model constructed analyze effective working range distribution characteristics soil. Second, using 2.45 GHz treatment, following conditions were tested: moisture 10%, 15%, 20% 23% (within natural content range). treated by irradiation for 1~12 min, respectively (1 min/time increment). A single-factor experiment designed influence these factors law. results show that two surface temperatures positively correlated with content, both which satisfy Tsurface23% > Tsurface20% Tsurface15% Tsurface10%, higher than loess. According experimental internal irradiated microwaves, equations “irradiation time–soil depth-soil temperature” content–soil fitting. When time same, average inside area satisfies T¯α long-term preliminarily confirmed feasibility optimal provides certain reference study diseases inactivation at high temperature.