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Modelling uptake of Na+ and Cl- by tomato in closed-cycle cultivation systems as influenced by irrigation water salinity

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  • Varlagas, H.
  • Savvas, D.
  • Mouzakis, G.
  • Liotsos, C.
  • Karapanos, I.
  • Sigrimis, N.

Abstract

The aim of the present investigation was to simulate the uptake concentrations (weights of ion per volume of water absorbed) of Na+ and Cl- in hydroponic tomato crops as a function of the NaCl concentration in the root zone. An empirical model was calibrated and validated, which can be incorporated into on-line operating decision support systems aimed at optimizing the nutrient supply and minimizing the discharge of drainage solution in tomato crops grown in closed-cycle hydroponic systems. Three experiments were conducted, of which one was carried out to calibrate the model using irrigation water with NaCl concentration ranging from 0 to 14.7molm-3 while the other two experiments were commissioned to validate the model within either a low (0.5-2molm-3) or a high (1.2-12molm-3) concentration range. The model could successfully predict the uptake concentration of Na+, but Cl- could not be simulated by this model at external Cl- concentrations lower than 10molm-3. The results indicate that Na+ is excluded actively and effectively by the tested tomato cultivar even at low external Na+ concentrations, while Cl- is readily taken up at low concentrations, particularly during the initial growing stages. Due to the efficient exclusion of Na+ by tomato, the Na+ concentration in the root environment increased rapidly to extremely high levels even when the Na+ concentration in the irrigation water was relatively low. These results indicate that tomato genotypes characterized by high salt-exclusion efficiency, require irrigation water with a very low NaCl concentration, if they are grown in closed hydroponic systems and the drainage water is not flushed periodically. To maintain Na+ at levels lower than 19molm-3 in the root zone of the tomato hybrid 'Formula' in closed hydroponics, a maximum acceptable Na+ concentration of 0.53molm-3 was estimated for the irrigation water.

Suggested Citation

  • Varlagas, H. & Savvas, D. & Mouzakis, G. & Liotsos, C. & Karapanos, I. & Sigrimis, N., 2010. "Modelling uptake of Na+ and Cl- by tomato in closed-cycle cultivation systems as influenced by irrigation water salinity," Agricultural Water Management, Elsevier, vol. 97(9), pages 1242-1250, September.
    • Handle: RePEc:eee:agiwat:v:97:y:2010:i:9:p:1242-1250
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    References listed on IDEAS

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    1. Carmassi, G. & Incrocci, L. & Maggini, R. & Malorgio, F. & Tognoni, F. & Pardossi, A., 2007. "An aggregated model for water requirements of greenhouse tomato grown in closed rockwool culture with saline water," Agricultural Water Management, Elsevier, vol. 88(1-3), pages 73-82, March.
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    Cited by:

    1. Neocleous, Damianos & Savvas, Dimitrios, 2018. "Modelling Ca2+ accumulation in soilless zucchini crops: Physiological and agronomical responses," Agricultural Water Management, Elsevier, vol. 203(C), pages 197-206.
    2. Neocleous, Damianos & Savvas, Dimitrios, 2016. "NaCl accumulation and macronutrient uptake by a melon crop in a closed hydroponic system in relation to water uptake," Agricultural Water Management, Elsevier, vol. 165(C), pages 22-32.
    3. Neocleous, Damianos & Nikolaou, Georgios & Ntatsi, Georgia & Savvas, Dimitrios, 2021. "Nitrate supply limitations in tomato crops grown in a chloride-amended recirculating nutrient solution," Agricultural Water Management, Elsevier, vol. 258(C).

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