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| Effects of Regulating Nutrient Solution Temperature on Growth and Yield of Pakchoi Hydroponically Cultured in Protected Cultivation over Summer |
| LU Tao，YU Hongjun，AI Shuang，LI Qiang，JIANG Weijie* |
| Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China |
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Abstract The nutrient solution temperature is of great importance for crop growth in the hydroponic
culture system．The excess temperature of nutrient solution often occurs during the production of over-summer
vegetables．This is an issue that will influence production．Taking 3 common pakchoi varieties‘Xialyu
No.2’‘Jinpin 1 xia’and‘Jingguan No.1 F1’as test materials，this experiment conducted cooling process on
nutrient solution by 2 different cooling materials：ice and ice gel，and studied the effects of different cooling
methods on growth and yield of facility and hydroponic cultured common pakchoi over summer by 3 ways
（T1，heat preservation quilt + 3 L ice gel；T2，heat preservation quilt + 5 L ice gel；T3，heat preservation +
5 L ice cubes）．The results showed that when 3 L ice gel or 5 L ice cubes were added into the nutrient solution
barrel wrapped with heat preservation quilt at the initial stage of rapid temperature rising of nutrient solution，
the temperature of nutrient solution could be reduced by 3-5 ℃ and suitable rhizosphere temperature could
be maintained about 5 h，which obviously could promote the growth，dry matter accumulation and yield
of common pakchoi．While，the treatment of heat preservation quilt + 5 L ice gel would drop temperature
of nutrient solution too much，resulting in too big temperature difference between above ground and
underground，being unfavorable for common pakchoi growth．To sum up，2 droping-temperature techniques
including heat preservation quilt + 3 L ice gel and heat preservation quilt + 5 L ice cubes，were very effective in
regulating temperature of nutrient solution in hydroponic culture over summer．
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Received: 25 April 2021
Published: 26 August 2021
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