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The Effect of Microwave Soil Treatment on Rice Production under Field Conditions

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASABE. 60(2): 517-525. (doi: 10.13031/trans.12125) @2017
Authors:   Muhammad Jamal /title-group>Khan, Graham Brodie, Dorin Gupta
Keywords:   Microwave, Pre-emergence weed management, Rice, Soil.

Abstract.

Interest in chemical-free weed management practices has increased to overcome herbicide resistance in sustainable crop production systems. In this study, we examined microwave (MW) irradiation as an alternative weed management strategy in a direct-seeded rice crop under field conditions. Pre-emergence MW irradiation (2.45 GHz, 600 W, 120 s) of the soil was assigned in a randomized complete block design with five replications. The projection of 560 J cm-2 of MW energy into the soil gave a temperature gradient of 80°C to 90°C in the top 5 to 6 cm, which induced a 70% to 80% reduction in weed establishment through the soil seedbank compared to the untreated control. Therefore, a 34% increase in the grain yield of rice (9.0 t ha-1) was achieved compared to the non-MW scenario (6.7 t ha-1). Microwave-based weed control could be effective in managing herbicide-resistant weed biotypes in cropping systems.

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