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一、根据气候确定地温在18℃左右,薯块增重很少,在15℃左右,块根停止膨大,9℃以下易发生冷害。因此,一般在地温18℃开始收刨,至气温在10℃~12℃,即枯霜前收获完毕。二、根据季节确定应在寒露前开始,到霜降前收刨结束。在这个适期范围内,先收春红薯,后收夏红薯;先收倒茬种小麦的地块,后收不种小麦的地块;先收留种用的夏红薯,后收鲜食用红薯;先收切晒薯干的,后收贮藏的;先收耐寒性弱的品种,后收耐寒性强的品种。
First, according to the climate to determine the ground temperature at about 18 ℃, little weight gain of tubers, at about 15 ℃, root tubers stop swelling, cold damage prone below 9 ℃. Therefore, the general start at 18 ℃ ground plane planing, to the temperature at 10 ℃ ~ 12 ℃, that is dry before the harvest is completed. Second, according to the season to be determined before the cold dew, until the end of frost salvage. In this context, the first to receive the spring sweet potato, sweet potato received after harvest; first crop down the wheat plots, after the receipt of non-wheat plots; first species of summer sweet potato storage, after harvest fresh sweet potato; First cut and dried slices of dried radish, after the collection of storage; first received weak cold varieties, after receiving hardy varieties.