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I have a Sheen (complete with wheeled trolley and flame hood) which I bought in 1958 and is still in regular use. I find it best for the following purposes:-........Burning off dead foliage (it won`t burn off green stuff)Sterilizing the soil surface to destroy weed seeds before cultivationSterilizing the soil surface of potato blight spores immediately after removing the potato foliage and before lifting the crop
.....it causes smaller seeds to incandesce, while larger ones again have their structure disrupted.... Only when the crop is relatively immature when the haulm is removed is it necessary to wait for 3 weeks for the skins to set. ....
The waiting is for the spores to die, not the potato skins to set.Phil