Microwave soil treatment improves weed management in Australian dryland wheat

Khan, M.J., Brodie, G., Gupta, D., and Foletta, S. (2018) Microwave soil treatment improves weed management in Australian dryland wheat. Transactions of the ASABE, 61 (2). pp. 671-680.

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Abstract

Herbicide resistance has prompted the development of a chemical-free weed management practice in no-till farming systems. In this study, we examined the effect of pre-emergence microwave (MW) soil treatment for weed management in a no-till wheat production system in Australia. One-time MW soil treatment (2.45 GHz, 600 W, 120 s) was applied to plots that were arranged in a randomized complete block design with five replicates. The MW energy was projected through a horn antenna with aperture dimensions of 5.5 cm x 11 cm into the topsoil (0 to 6 cm) horizon. The applied MW energy density in the treated plots (2.6 m(2)), which was calculated by Simpson's numerical surface integral approximation, was approximately 560 J cm(-2). This achieved an increase in soil temperature of about 75 degrees C to 80 degrees C. This temperature induced a 65% to 80% reduction in weed establishment through thermal devitalization of the weed seedbank, compared to the untreated control plots. In addition, a substantial increase in wheat grain yield of 39.2% was achieved through MW energy application (7.8 t ha(-1)) compared to non-MW conditions (5.6 t ha(-1)). In summary, this non-chemical weed management strategy promises to effectively control herbicide-resistant weeds and sustain dryland wheat yields.

Item ID: 53657
Item Type: Article (Research - C1)
ISSN: 2151-0040
Keywords: microwave energy, soil, weed suppression, wheat
Date Deposited: 16 May 2018 07:40
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds) @ 100%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8205 Winter Grains and Oilseeds > 820599 Winter Grains and Oilseeds not elsewhere classified @ 50%
82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8204 Summer Grains and Oilseeds > 820499 Summer Grains and Oilseeds not elsewhere classified @ 50%
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