Hydrion-line, towards a closed system for water and nutrients : feedback control of water and nutrients in the drain

T.H. Gieling, F.J.M. Corver, H.J.J. Janssen, G. van Straten, R.J.C. van Ooteghem, G.J. van Dijk

    Research output: Contribution to journalArticleAcademicpeer-review

    18 Citations (Scopus)

    Abstract

    The development and market introduction of affordable ion specific sensors, like the ISFET sensor, has paved the way for completely new systems for application of fertilisers to crops in greenhouses. This paper describes the use of information feedback from flow sensors and ion specific sensors to regulate the supply of water and nutrients to a model gully. When a controller keeps the drain flow and the concentrations of the individual ions in the drain at a sufficiently high fixed value, the uptake of the plants is intrinsically compensated, i.e. the demand of the plants is exactly satisfied. Time series measurements of flow and concentration in supply and drain are used to design the controller for applying nutrients to a tomato crop in a near-practice greenhouse. Data are shown of fertiliser concentrations and flow in supply and drain during the design phase and test phase of the controller.
    Original languageEnglish
    Pages (from-to)259-266
    JournalActa Horticulturae
    Volume691
    DOIs
    Publication statusPublished - 2005

    Fingerprint Dive into the research topics of 'Hydrion-line, towards a closed system for water and nutrients : feedback control of water and nutrients in the drain'. Together they form a unique fingerprint.

    Cite this