Identification and Control of Hydroponic System Using Ion Sensors

Hashimoto, Yasushi; Morimoto, T.; Fukuyama, Tokihiko; Watake, H.; Yamaguchi, S.; Kikuchi, Hidekazu

doi:10.17660/actahortic.1989.245.66

Cited by 9 publications

(2 citation statements)

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“…In many publications ion sensitive sensors are used to monitor the ion concentration in the nutrient solution and to estimate the nutrient uptake by plants [30,56]. Approaches to an online control of the nutrient solution composition are, as outlined above, mostly on a theoretical level.…”

Section: Feedback Control Using Ion Sensitive Measurements Of the Dramentioning

confidence: 99%

Strategies to control water and nutrient supplies to greenhouse crops. A review

Kläring

2001

Agronomie

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International audienceThis paper introduces the approaches to automatic control of water and nutrient supplies to greenhouse crops. The traditional concepts of surplus irrigation and fertilization conflict with the environmental aspect. Therefore, water and nutrient demands of the plants must be met by the supplies. The generally used strategy is based on the application of standard nutrient solutions and frequent analyses of the nutrient solution concentration in the root environment. An improvement to this strategy is expected by using a feedback control, which takes ion sensitive measurements of the drainage water concentration or a feedforward control, where nutrient and water uptake are predicted using growth and transpiration models. Most of these approaches are still on a theoretical level and are far from being practical applications. Current strategies are directed towards the synchronization of uptake and supply, but future strategies should control plant functioning.Mise au point : stratégies pour contrôler les apports d'eau et d'éléments nutritifs aux cultures sous serre. Cet article introduit les approches pour un contrôle automatique des alimentations en eau et en éléments nutritifs pour les cultures sous serre. Le concept traditionnel d'irrigation et de fertilisation excédentaires entre en conflit avec les aspects environnementaux. Cependant, les demandes d'eau et d'éléments nutritifs des plantes doivent être satisfaits par les apports. La stratégie utilisée généralement est basée sur l'emploi de solutions nutritives standard et de fréquentes analyses de la concentration de la solution nutritive dans l'environnement des racines. Une amélioration de cette stratégie est espérée en utilisant un système de rétroaction, qui prend en compte des mesures sensibles de la concentration ionique de l'eau de drainage, ou un système de réaction anticipée dans lequel les besoins en eau en éléments nutritifs sont prévus à parti de modèles de croissance et de transpiration. Ces approches sont pour la plupart d'entre elles, développées sur un plant théorique et sont encore loin des applications pratiques. Les stratégies actuelles sont dirigées vers la synchronisation des prélèvements et des apports, mais les stratégies futures devront contrôler le fonctionnement des plantes

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Section: Feedback Control Using Ion Sensitive Measurements Of the Dramentioning

confidence: 99%

Strategies to control water and nutrient supplies to greenhouse crops. A review

Kläring

2001

Agronomie

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“…There has been great interest in their specific relevance in soil and nutrient solution monitoring for plant growth [5,6,36,135–138]. And there have been several explicit tests of ISEs for hydroponic nutrient solution monitoring [5,14,41,42,44,139,140].…”

Section: Ion-selective Sensor Technologies For Terrestrial and Space-mentioning

confidence: 99%

Ion-Specific Nutrient Management in Closed Systems: The Necessity for Ion-Selective Sensors in Terrestrial and Space-Based Agriculture and Water Management Systems

Bamsey

Graham

Thompson

et al. 2012

Sensors

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The ability to monitor and control plant nutrient ions in fertigation solutions, on an ion-specific basis, is critical to the future of controlled environment agriculture crop production, be it in traditional terrestrial settings (e.g., greenhouse crop production) or as a component of bioregenerative life support systems for long duration space exploration. Several technologies are currently available that can provide the required measurement of ion-specific activities in solution. The greenhouse sector has invested in research examining the potential of a number of these technologies to meet the industry's demanding requirements, and although no ideal solution yet exists for on-line measurement, growers do utilize technologies such as high-performance liquid chromatography to provide off-line measurements. An analogous situation exists on the International Space Station where, technological solutions are sought, but currently on-orbit water quality monitoring is considerably restricted. This paper examines the specific advantages that on-line ion-selective sensors could provide to plant production systems both terrestrially and when utilized in space-based biological life support systems and how similar technologies could be applied to nominal on-orbit water quality monitoring. A historical development and technical review of the various ion-selective monitoring technologies is provided.

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