Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 477641
Title Chemical analysis of substrates with controlled release fertilizer
Author(s) Kreij, C. de
Source In: International Symposium on Growing Media and Hydroponics. - Leuven : ISHS - ISBN 9789066055377 - p. 337 - 341.
Event Leuven : ISHS - ISBN 9789066055377 International Symposium on Growing Media and Hydroponics 2004, Alnarp, 2004-06-15/2004-06-16
Department(s) Wageningen UR Greenhouse Horticulture
Publication type Contribution in proceedings
Publication year 2004
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.
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