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| Practice on Tomato Overwinter Production in External Thermal Insulation Largespan Plastic Greenhouse in Xuhuai Region |
| WANG Jun1，LI Yansu1，ZHANG Aimin2，MENG Lei2，ZHANG Shengfeng3，YU Xianchang1* |
| 1Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2Xuzhou Institute of Vegetables，Xuzhou 221004，Jiangsu，China；3Xuzhou Fengshuo Green Agriculture Technology Co.，Ltd.，Xuzhou 221000，Jiangsu，China） |
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Abstract External thermal insulation large-span plastic greenhouse has many advantages，including large cultivation space，high land utilization rate，convenient in mechanical operation，etc．It has gradually become one of the selectable facilities for vegetable overwinter production．An external thermal insulation large-span plastic greenhouse was constructed in Xuzhou region．It was compared with the internal environment temperature of local typical solar greenhouse of 60 cm thick brick wall （concrete brickwork）．Then，an overwinter tomato production practice was conducted．Results showed that under discrete low temperature condition during January-March，the inside air temperature of the plastic greenhouse could reach the thermal insulation properties of the brick wall solar greenhouse．The air temperature could be maintained around 10 ℃，yet the tomato yield was not reduced．The initial construction cost of plastic greenhouse were very close to that of the local typical brick wall solar greenhouse，while its land utilization rate could reach up to 84.0%，35.5 percentage point higher than that of the brick wall solar greenhouse．To sum up，external thermal insulation large-span plastic greenhouse can be widely popularized and applied as a new type cultivation facility in Xuhuai area for fruit vegetable overwinter production．
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Received: 09 July 2020
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