There have been some applications of microwaves in agriculture with insect control in grain storage, hard seed breakdown [and that was an area we did R and D on as well], product drying and similar issues having been areas of some success.
Recently some funded research by RIRDC has been targeted at weed control, through desiccation as well as aiming to control and kill seeds in the shallow surface layers of soil.
A recent press release has indicated this might be delivering some promising results at least at a modest scale. Getting it upsized to field use will be an issue, as the "device" will need to allow modest travel speeds while delivering adequate rates of energy to kill weeds and soil borne seeds.
But.........it does provide a new option in thinking. While steam is used as a non herbicide option, it is slow to use. And there is some pressure to develop new options because of developing concern over glyphosate resistant annual summer weeds in many cereal growing regions.
Read more here -
http://qcl.farmonline.com.au/news/nationalrural/grains-and-cropping/general/giving-weeds-a-nuke/2431010.aspx?utm_source=newsletter&utm_medium=email&utm_campaign=newsletter
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