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Analysis of Irrigation, Crop Growth and Physiological Information in Substrate Cultivation Using an Intelligent Weighing System

Author

Listed:
  • Jiu Xu

    (College of Horticulture and Landscape, Tianjin Agriculture University, Tianjin 300384, China
    Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Lili Zhangzhong

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Peng Lu

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Yihan Wang

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Qian Zhao

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Youli Li

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

  • Lichun Wang

    (Intelligent Equipment Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

Abstract

The online dynamic collection of irrigation and plant physiological information is crucial for the precise irrigation management of nutrient solutions and efficient crop cultivation in vegetable soilless substrate cultivation facilities. In this study, an intelligent weighing system was installed in a tomato substrate cultivation greenhouse. The monitored values from the intelligent weighing system’s pressure-type module were used to calculate irrigation start–stop times, frequency, volume, drainage volume, drainage rate, evapotranspiration, evapotranspiration rate, and stomatal conductance. In contrast, the monitored values of the suspension-type weighing module were used to calculate the amount of weight change in the plants, which supported the dynamic and quantitative characterization of substrate cultivation irrigation and crop growth based on an intelligent weighing system. The results showed that the monitoring curves of pressure and flow sensors based on the pressure-type module could accurately identify the irrigation start time and number of irrigations and calculate the irrigation volume, drainage volume, and drainage rate. The calculated irrigation amount was closely aligned with that determined by an integrated-water–fertilizer automatic control system (R 2 = 0.923; mean absolute error (MAE) = 0.105 mL; root-mean-square error (RMSE) = 0.132 mL). Furthermore, transpiration rate and leaf stomatal conductance were obtained through inversion, and the R 2 , MAE, and RMSE of the extinction coefficient correction model were 0.820, 0.014 mol·m −2 ·s −1 , and 0.017 mol·m −2 ·s −1 , respectively. Compared to traditional estimation methods, the MAE and RMSE decreased by 12.5% and 15.0%, respectively. The measured values of fruit picking and leaf stripping linearly fitted with the calculated values of the suspended weighing module, and R 2 , MAE, and RMSE were 0.958, 0.145 g, and 0.143 g, respectively. This indicated that data collection based on the suspension-type weighing module could allow for a dynamic analysis of plant weight changes and fruit yield. In summary, the intelligent weighing system could accurately analyze irrigation information and crop growth physiological indicators under the practical application conditions of facility vegetable substrate cultivation, providing technical support for the precise management of nutrient solutions.

Suggested Citation

  • Jiu Xu & Lili Zhangzhong & Peng Lu & Yihan Wang & Qian Zhao & Youli Li & Lichun Wang, 2025. "Analysis of Irrigation, Crop Growth and Physiological Information in Substrate Cultivation Using an Intelligent Weighing System," Agriculture, MDPI, vol. 15(10), pages 1-20, May.
    • Handle: RePEc:gam:jagris:v:15:y:2025:i:10:p:1113-:d:1661317
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    References listed on IDEAS

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    2. Ballester, C. & Castel, J. & Intrigliolo, D.S. & Castel, J.R., 2011. "Response of Clementina de Nules citrus trees to summer deficit irrigation. Yield components and fruit composition," Agricultural Water Management, Elsevier, vol. 98(6), pages 1027-1032, April.
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    4. Awais Ali & Genhua Niu & Joseph Masabni & Antonio Ferrante & Giacomo Cocetta, 2024. "Integrated Nutrient Management of Fruits, Vegetables, and Crops through the Use of Biostimulants, Soilless Cultivation, and Traditional and Modern Approaches—A Mini Review," Agriculture, MDPI, vol. 14(8), pages 1-28, August.
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