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Effects of Oxygenated Brackish Water on Pakchoi ( Brassica chinensis L.) Growth Characteristics Based on a Logistic Crop Growth Model

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  • Yuyang Shan

    (State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China)

  • Yan Sun

    (State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China)

  • Wanghai Tao

    (State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China)

  • Lijun Su

    (State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China)

Abstract

Oxygenated irrigation can improve soil physical and chemical properties and increase vegetable yields. It provides an effective method for safe and efficient utilization of brackish water, but its growth-promoting pathway is unclear. We investigated the effects of brackish water culture at five dissolved oxygen concentrations (9.5 (CK), 12.5, 15.5, 18.5, and 22.5 mg/L) on pakchoi ( Brassica chinensis L.) growth characteristics by hydroponics experiment, and the logistic model to fit and analyze pakchoi growth characteristics. At a brackish water dissolved oxygen concentration of 18.5 mg/L, nitrogen mass fraction was significantly higher than in a control treatment by 43.4%, and pakchoi effective accumulated temperature increment during vigorous plant height and root length growth was significantly lower than other treatments. The logistic model effectively simulated pakchoi plant height and root length growth, and both theoretical maximum plant height and root length reached their maximum values at 18.5 mg/L dissolved oxygen concentration. Path analysis showed that the maximum net photosynthetic rate and nitrogen mass fraction were the main factors affecting aboveground pakchoi fresh weight. In conclusion, a dissolved oxygen concentration of 18.5 mg/L in brackish water is more appropriate for pakchoi to achieve high yield under brackish water hydroponics conditions. Our results provide guidance for the safe and efficient utilization of brackish water in green and efficient vegetable production.

Suggested Citation

  • Yuyang Shan & Yan Sun & Wanghai Tao & Lijun Su, 2023. "Effects of Oxygenated Brackish Water on Pakchoi ( Brassica chinensis L.) Growth Characteristics Based on a Logistic Crop Growth Model," Agriculture, MDPI, vol. 13(7), pages 1-17, July.
    • Handle: RePEc:gam:jagris:v:13:y:2023:i:7:p:1345-:d:1186088
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    References listed on IDEAS

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