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| Studies on Regulating and Controlling Excessive Growth of Cucumber Seedlings by CCC Applying Method and Irrigation Water Temperature |
| SANG Jiajun 1,2，JI Yanhai 2，3，LIU Mingchi 2，3，WU Zhanhui 2，3，WANG Liping 1，WANG Suna 1* |
1 College of Landscape and Ecology，Hebei University of Engineering，Handan 056038，Hebei，China；2 Institute of
Vegetable Science，Beijing Academy of Agricultural and Forestry Sciences，Beijing 100097，China；3 Key Laboratory of Urban
Agriculture of North China，Ministry of Agriculture and Rural Affairs，Beijing 100097，China |
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Abstract Taking‘Jingyan 118’cucumber as test material，this experiment set 3 irrigation water
temperatures（10 ℃，15 ℃ and 22 ℃）and 2 CCC applying methods（foliage spray and along with water
irrigation）；studied the effects of irrigation water temperature and CCC applying method on cucumber seedling
growth，strong seedling index and chlorophyll fluorescence parameters of leaves；and explored the technology
for regulating and controlling excessive growth of cucumber seedlings．The results showed that treatments
with different CCC applying method and irrigation water temperature all could significantly reduce the plant
height of cucumber seedlings．The strong seedling index in along with water irrigation treatments were
higher than that of foliage spraying treatments．Under the same CCC applying method，reducing irrigation
water temperature could inhibit cucumber seedlings excessive growth to certain degree．But it would reduce
the SPAD value of leaves，and cause some damage to them．In a comprehensive analysis，the treatment
combining 200 mg · L-1 CCC concentration，along with water irrigation， and 22 ℃ irrigation water temperature
can effectively inhibit the excessive growth of cucumber seedlings，and achieve the best strong seedling
effect．This is a suitable regulating and controlling measure for strong cucumber seedlings．
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Received: 23 December 2021
Published: 15 April 2022
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