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| Effect of Temperature in Directional Trough on Expansion and Development of Chinese Yam Tuber |
| GUO Wenqi1，ZHANG Peitong1*，WANG Li1，LIU Xiansong2，YIN Jianmei1，JIN Lin1，JIANG Lu1，HAN Xiaoyong1，DU Jing1，LI Chunhong1 |
| 1Institute of Industrial Crops，Jiangsu Academy of Agricultural Sciences，Nanjing 210014，Jiangsu，China；2Agricultural Technology Extension Service Center of Suyangshan Town，Pizhou City，Pizhou 221300，Jiangsu，China |
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Abstract Taking the supergene planting in directional trough pattern，this paper studied the effect of temperature of directional trough on Chinese yam tuber expansion and development by straw mulching measure．The results showed that the high temperature in directional trough during Chinese yam expansion period was mainly caused by the combined action of air temperature and sunshine．Straw mulching measure had reduced the daily average temperature，daily maximum temperature and daily range of temperature in the directional trough and tuber deformity rate，yet the yield was improved．Straw mulching measure had promoted the yam tuber expansion mainly through improving the accumulation rate of fresh and dry weights during the expansion accelerating period and rapid expansion period of yam tubers．Then，the yield of Chinese yam was increased．Furthermore，straw mulching measure had increased the contents of starch，saponin and polysaccharide in tubers，thus improved the quality of Chinese yam．
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Received: 10 March 2021
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