I made a flame weeder about 8 years ago,runs on propane gas . 40kg of gas covers about 1 acre.
Brillent on  annual  seedling weeds not so good with grasses and perennial weeds. Best results where achieved on the afternoon of a leaf day during the  week of full moon.I use mind 3 or 4 times for stale seed bed  preparation before planting.
Cheers Tony Robinson
Land Down Under

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