在日本烟草栽培系统中,垄上覆盖塑料薄膜是为了防止土壤和肥料的淋溶,促进烟株早期生长。在冲绳(位于日本南部),过去由于地理和气候条件,覆盖栽培不是主要的栽培系统,但由于土传病害频繁发生,烟株生长不整齐,使烟叶产量不稳定。二十世纪90年代后期开始推广了这种栽培系统。覆盖 In Japanese tobacco growing systems, plastic film is covered on the ridge to prevent leaching of soil and fertilizers and to promote early tobacco growth. In Okinawa (southern Japan), past cultivation was not a major cultivation system due to geographical and climatic conditions in the past. However, due to the frequent occurrence of soil-borne diseases, tobacco plants grew irregularly and destabilized tobacco production. The cultivation system was introduced in the late 1990s. cover