Chemical analysis of substrates with controlled release fertilizer

C. de Kreij

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

    3 Citations (Scopus)

    Abstract

    Water-soluble fertilizer added to media containing controlled release fertilizer cannot be analysed with the 1:1.5 volume water extract, because the latter increases the element content in the extract. During storage and stirring or mixing the substrate with the extractant, part of the controlled release fertilizer is already released. To quantify this increase, a laboratory trial has been conducted. Osmocote granules with release characteristics of 3-4, 5-6, 8-9, 12-14 months have been mixed in different quantities to a peaty substrate and stored at 11 and 21 °C. Samples have been analysed at day 3 and 10. The increase of the element contents in water extracts was greater when a) the duration of the release was shorter (more release of the 3-4 months than the 12-14 months), b) the time between the mixing and the analysis was longer and c) the addition was higher. It was possible to predict the effect of a certain type and amount of Osmocote and number of days between mixing the fertilizer and the analysis on the element contents in the 1:1.5 volume extract. Substrates containing slow release fertilizer should not be stored.
    Original languageEnglish
    Title of host publicationInternational Symposium on Growing Media and Hydroponics
    EditorsB. Alsanius, P. Jensén, H. Asp
    Place of PublicationLeuven
    PublisherISHS
    Pages337-341
    Volume644
    ISBN (Print)9789066055377
    Publication statusPublished - 2004
    EventInternational Symposium on Growing Media and Hydroponics 2004 - Alnarp, Sweden
    Duration: 15 Jun 200416 Jun 2004

    Conference/symposium

    Conference/symposiumInternational Symposium on Growing Media and Hydroponics 2004
    Country/TerritorySweden
    CityAlnarp
    Period15/06/0416/06/04

    Keywords

    • Extraction
    • Osmocote
    • Peat
    • Storage
    • Water soluble

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