Abstract: Effects of mulching patterns on fresh yield and starch content of winter potato （Solanum tuberosum L.） in Chengdu Plain were researched. Three different potato varieties were used as material and three muuching patterns such as white film,black film mulching,black film mulching with covering soil were set to determine the emergence stage,plant height,tempreture of 15 cm under film,fresh yield,dry mattern content,starch content,etc. The results showed that：the plant height of wight film treatments was significant lower than that of black film treatments. Early in potato growing stage,the tempreture of 15 cm under film of wight film treatments was higher than that of black film treatments. Be compared with black film treatments,the seedling stage of white film treatment of Chuanyu 16 was 4~7 d earlier while the yield of that was increased by 5.54%. For Chuanyucai No. 1 and Heimeiren,the seedling stage of black film treatments was 1~7 d later than that of white film treatment while the yiled of yield were increased by 25.25% and 39.43%,respectively. The starch content of white film treatment of Chuanyucai No. 1 was lower than that of black film treatments,but that of Heimeiren do the reverse. Therefore, the suitable mulching patterens should be used according to the variety types of winter potato in production.

Key words: winter potato（Solanum tuberosum L.）, mulching pattern, plant height, yield, starch content