ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (5): 153-162. doi: 10.7668/hbnxb.201751708

Special Issue: Cucumber

• Tillage and Cultivation·Physiology and Biochemistry • Previous Articles     Next Articles

Effects of Nutrient Solution Concentration on Quality, Yield and Photosynthetic Characteristics of Cucumber Grown in Enclosed Circulation Trough

MENG Xianmin1,2, JI Yanhai1,3, WU Zhanhui1,3, CHU Zhaosheng1, LIU Mingchi1,3   

  1. 1. Vegetable Research Center, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China;
    2. College of Landscape and Ecological Engineering, Hebei University of Engineering, Handan 056038, China;
    3. Key Laboratory of North China Urban Agriculture, Ministry of Agriculture, Beijing 100097, China
  • Received:2019-05-03 Published:2019-10-28

Abstract: In order to screen the suitable concentration of nutrient solution for enclosed circulation trough of Cucumis sativus L., taking advantages of the characteristics of nutrient solution recycling in enclosed circulation trough, the effect of different concentrations of nutrient solution on the growth, quality, yield, photosynthetic capacity and microstructure of leaves were studied. Using Zhongnong 26 as experimental material, the basic EC value of nutrient solution was 2.7 mS/cm, the five treatments were T1, T2 (CK), T3, T4 and T5 (EC value 2.3, 2.7, 3.1, 3.5, 3.9 mS/cm respectively) and the growth status, photosynthetic capacity of leaves, fruit quality and yield were screened. The results showed that with the increase of EC value, the content of soluble sugar increased and VC, free amino acid and soluble protein of cucumber first increased and then decreased. Compared with T2, T3 had a better blade structure with closely arranged palisade tissue and relatively loose sponge tissue, and the qP,ΦPSⅡ and ETR values were higher than those of other treatments, which the open degree of PSⅡ reaction center, the efficiency of the original photochemical reaction and the electron transfer of the PSⅡ was significantly improved.And the light energy was mainly distributed to the photochemical reaction P and the antenna heat dissipation D, and reduced the part of non-photochemical dissipation Ex. The value of β/α-1 for T3 was the lowest and qP was the highest, the PSⅠ and PSⅡ were relatively balanced, the light energy utilization efficiency was higher, and the photosynthesis of leaves was enhanced, which was also the material basis for improving fruit quality and yield. Therefore, T3 treatment was more suitable for cucumber growth and development. The content of soluble sugar and soluble solids of T4 was higher than T2, there was no significant difference with T3 yet. The net photosynthetic rate and the photosynthetic pigment content in T4 leaves were the highest, Pn was increased by 58.85% compared with T2.In addition, the T3 and T4 treatments were lower in Fo and the Fv/Fm was higher than the T2 treatment, the PSⅡ reaction center activity of both were higher. Under the condition of closed trough culture, the photosynthetic electron transfer efficiency of cucumber leaves with EC value of 3.1 and 3.5 mS/cm was higher, and the photosynthetic capacity was enhanced, which improved the yield and quality of cucumber.

Key words: Cucumis sativus L., Concentration of nutrient solution, EC value, Quality, Yield, Photosynthesis characteristics

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Cite this article

MENG Xianmin, JI Yanhai, WU Zhanhui, CHU Zhaosheng, LIU Mingchi. Effects of Nutrient Solution Concentration on Quality, Yield and Photosynthetic Characteristics of Cucumber Grown in Enclosed Circulation Trough[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(5): 153-162. doi: 10.7668/hbnxb.201751708.

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