A method for estimating K+ and NO-3 uptake rate in hydroponics by a four-electrode conductivity sensor

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Abstract

A four-electrode conductivity sensor and associated electronics were designed and applied to the continuous monitoring of conductivity and the rate of K+ and NO-3 uptake in a hydroponic system. The new device was successfully used to monitor continuously the depletion rate of K+ and NO-3 in a hydroponic solution in which tomato plants (Lycopersicon esculentum cultivar 'Naama') were cultivated. A model is proposed for estimating the rate of K+ and NO-3 uptake by the plant, and their total concentration, from conductivity measurements. Experimental results verify the proposed mathematical criterion for choosing the initial concentrations of K+ and NO-3, and validate the underlying assumption of the proposed model.

Original languageEnglish
Pages (from-to)113-122
Number of pages10
JournalScientia Horticulturae
Volume21
Issue number2
DOIs
StatePublished - 1 Jan 1983

Keywords

  • four-electrode conductivity system
  • hydroponics
  • tomato

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