Elemental bioavailability in nutrient solutions in relation to complexation reactions

Rijck, G De; Schrevens, Eddie

doi:10.1080/01904169809365448

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…It is surprising that the recommended potassium and phosphorus concentrations in the root environment are not between the supply and mean calculated drainage water concentrations. For these elements, it is not possible to explain this by dissociation, complexation or precipitation reactions in the nutrient solution [14].…”

Section: Characteristicmentioning

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: Characteristicmentioning

confidence: 99%

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

Kläring

2001

Agronomie

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“…At a pH above 8.3, Ca 2+ and Mg 2+ ions easily precipitate as carbonates by reacting with CO 3 2À . Also sulphate forms relatively strong complexes with Ca 2+ and Mg 2+ (De Rijck and Schrevens 1998). As pH increases from 2 to 9, the amount of SO 4 2À forming soluble complexes with Mg 2+ as MgSO 4 and with K + as KSO 4…”

Section: Nutrient Solution Propertiesmentioning

confidence: 99%

Aquaponics Food Production Systems

Goddek¹,

Joyce²,

Kotzen³

et al. 2019

200

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“…Also, as mentioned above, when the pH of the nutrient solution increases, the HPO 4 2-ion predominates, which precipitates with Ca 2+ when the product of the concentration of these ions is greater than 2.2, expressed in mol m -3 (Steiner, 1984). Sulphate also forms relatively strong complexes with Ca 2+ and Mg 2+ (De Rijck & Schrevens, 1998b). As pH increases from 2 to 9, the amount of SO 4 2-, forming soluble complexes with Mg 2+ as MgSO 4 and with K + as KSO 4 -increases (De Rijck & Schrevens, 1999).…”

Section: Nutrient Solutionmentioning

confidence: 97%