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- Title
Establishment of simulation model and weeding and disinfection effects of soil heating by microwave.
- Authors
MA Sipeng; JIN Hongling; ZHAO Yajun; HU Hongyan; HU Xiaoping
- Abstract
[Objective] This study investigated the effect of microwave disinfection on soil diseases, pests and weeds to provide support for green and sustainable agricultural development. [Method] Based on COMSOL Multiphysics software, the electromagnetic and heat transfer multi-physical coupling model of soil heating by microwave was established, and the distribution of soil temperature along with time and space under microwave treatment was simulated. Based on the simulation results, the soil with three different moisture contents (2%, 10% and 20%) was radiated for 5 min by a 700 W microwave test device, followed by 30 min standing still. The change of soil temperature with time was studied by a sensor, and the model performance was verified. Finally, 2 kinds of common weed seeds and Fusarium were selected for soil disinfection test to verify the effect of weed disinfection by microwave heating. [Result] After microware treatment for 5 min in heating test, soil with moisture contents of 2%, 10% and 20% had the lowest temperature of 52, 92 and 72 °C at the depth of 4 cm and the temperature of 44, 50 and 46 °C at the depth of 8 cm. In the insulation stage, the heat conduction from the upper soil increased the soil temperature with the three soil moisture contents at the depth of 8 cm by 8, 11 and 7 °C, respectively. The model verification results showed that the test temperatures at temperature measurement points were close to simulation results with maximum error of less than 12%, indicating that the simulation model was reliable. For ryegrass and setaria setaria, the seed germination rates were 80% in 2% soil at 4 cm depth and 8% in 10% and 20% soil at 4 cm depth. The highest germination rate of Fusarium under 3 different water contents reached 100% after 3 min microwave radiation. After 5 min microwave radiation, the highest germination rate of Fusarium in soil depth of 4 cm was 5%. In soil depth of 8 cm, the soil with water content of 2% had the lowest ger-mination rate (maximum 32%), while the soil with water content of 20% had the highest germination rate (maximum 63%). [Conclusion] Microwave heating effectively inhibited the germination of weed seeds and fungi, and its effect depended on the thermal effect of microwave on soil. The soil temperature of microwave treatment was mainly affected by soil moisture, burial depth and radiation time.
- Publication
Journal of Northwest A & F University - Natural Science Edition, 2022, Vol 50, Issue 8, p146
- ISSN
1671-9387
- Publication type
Article
- DOI
10.13207/j.cnki.jnwafu.2022.08.016