（1Agricultural Technology Extension Station of Jiangsu Province，Nanjing 210036，Jiangsu，China；2Institute of Industrial Crops，Jiangsu Academy of Agricultural Sciences，Nanjing 210014，Jiangsu，China）
Abstract：Taro is a special cash crop in Jiangsu Province．It has large cultivated area and high utilization rate of mulch film．However，it is very difficult to recycle mulch film．The inability of naturally degrading it has caused environmental pollution，which are unfavorable for large-scale and sustainable development of taro industry in Jiangsu Province．Taking ordinary polyethylene（PE）mulch film as the contrast，this paper studied the effects of poly butylene adipate-co-terephthalate（PBAT）full biodegradation film，and poly lactic acid（PLA）full biodegradation film on taro yield and soil environment．The results showed that the PLA full biodegradation film exhibited obvious effects on improving emergence rate and promoting taro nutritional growth．Compaired with PE mulch，the taro yield using PLA full biodegradation film was increased by 18.1%-27.3%．The cracking period of the PLA full biodegradation film was more suitable，and its effect on controlling weed was better．PLA full biodegradation film could also effectively reduce the labor cost，being economically feasible．In the same year，its mulch degradation rate reached over 80%．About one year later the residual soil film was naturally degraded and elimilated．Basically，it had no effect on crop production，and could be used as a substitute of common PE mulch film in Jiangsu taro production．
