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

S. Ben-Yaakov; J. Ben-Asher

doi:10.1016/0304-4238(83)90156-5

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

S. Ben-Yaakov, J. Ben-Asher

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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 language	English
Pages (from-to)	113-122
Number of pages	10
Journal	Scientia Horticulturae
Volume	21
Issue number	2
DOIs	https://doi.org/10.1016/0304-4238(83)90156-5
State	Published - 1 Jan 1983

Keywords

four-electrode conductivity system
hydroponics
tomato

ASJC Scopus subject areas

Horticulture

Access to Document

10.1016/0304-4238(83)90156-5

Cite this

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

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.",

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AB - 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.

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