Nutrients and toxic substances accumulation in the plant and their effect on uptake: Simulation study in hydroponics

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    2 Scopus citations

    Abstract

    Soilless plant growth systems are widely used as a means to save irrigation water and to reduce groundwater contamination. While nutrient concentrations in the growth medium are depleted due to uptake by the plants, salinity and toxic substances accumulate due to transpiration. A theoretical model is suggested to simulate nutrient uptake by plants grown in hydroponics with recycled solutions. The model accounts for salinity accumulation with time and plant growth and its effects on uptake of the different nutrients by means of interaction with Na and Cl ions. Influx, as a function of the ion concentration, is according to Michaelis-Menten active mechanisms for K+, NO3 --N, NH4+-N, PO4-P, Ca2+, Mg2+ and SO42-. Influx parameters are affected by the accumulation of these ions and Na+ and Cl- in the plant. Sodium influx is passive above a critical concentration. Salinity (due to Na concentration) suppresses root and leaf growth, which further affects uptake and transpiration. The model was tested against K and N uptake by plants associated with cumulative transpiration and with different NaCl salinity levels. The model was used to simulate ion interaction in uptake, shoot growth, root growth, and the effects of nutrient accumulation in the plant on uptake. The results indicated that N uptake and content in the plant are most sensitive to interactions with NaCl salinity.

    Original languageEnglish
    Title of host publicationIV International Symposium on Models for Plant Growth and Control in Greenhoues
    Subtitle of host publicationModeling for the 21st Century - Agronomic and Greenhouse Crop Models
    PublisherInternational Society for Horticultural Science
    Pages235-242
    Number of pages8
    ISBN (Print)9789066058460
    DOIs
    StatePublished - 1 Jan 2002

    Publication series

    NameActa Horticulturae
    Volume593
    ISSN (Print)0567-7572

    Keywords

    • Hydroponics
    • Ion influx
    • Recycled nutrient solution
    • Root growth
    • Salinity buildup
    • Simulation study
    • Soilless culture
    • Uptake mechanisms

    ASJC Scopus subject areas

    • Horticulture

    Fingerprint

    Dive into the research topics of 'Nutrients and toxic substances accumulation in the plant and their effect on uptake: Simulation study in hydroponics'. Together they form a unique fingerprint.

    Cite this