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| Effect of Substrate Heating on Tomato Growth and Quality in Solar Greenhouse in Winter |
| YUAN Ding1，3，WU Zhan-hui1，2，JI Yan-hai1，2，LIU Ming-chi1，2，WANG Li-ping3，TONG Jing1，2，LIANG Hao1，2* |
| 1Vegetable Research Center，Beijing Academy of Agricultural and Forestry Sciences，Beijing 100097，China；2Key Laboratory of Urban Agriculture of North China，Ministry of Agriculture and Rural Affairs，Beijing 100097，China；3College of Landscape and Ecological Engineering，Hebei University of Engineering，Handan 056000，Hebei，China |
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Abstract The root system was directly heated by electric heating line．The substrate heating temperature was set at 22，28，34 ℃．The paper studied the root temperature field distribution under different temperature and its effect on growth and quality of tomato cultivated in soilless condition．The results showed that using coconut bran as substrate，setting up different heating temperatures could increase the average temperature in central substrate to 22.4，29.8，35.2 ℃ at night．Compared with the contrast without heating，heating to 22 ℃ and 28 ℃ could significantly increase the yield of single tomato plant，plant height，stem diameter，number of leaves，fresh/dry weight of root stem，VC，soluble sugar，soluble solid matter，soluble protein，titratable acid，etc. quality indexes．The energy consumption of single tomato plant treated at 22 ℃ was 11.33 kWh，which was significantly lower than 14.86 kWh treated at 28 ℃．
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Received: 12 August 2019
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