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 553473
Title Towards zero-liquid discharge in hydroponic cultivation
Author(s) Ruijven, J. van; Os, E. van; Beerling, E.; Blok, C.; Janse, J.
Source Acta Horticulturae 1242 (2019). - ISSN 0567-7572 - p. 863 - 871.
Department(s) GTB Gewasgez. Bodem en Water
GTB Tuinbouw Technologie
GTB Teelt & Gewasfysiologie
Publication type Refereed Article in a scientific journal
Publication year 2019
Availibility Full text available from 2020-07-10
Keyword(s) Emission - Greenhouse horticulture - Pesticides - Plant protection products - Soilless culture - Sweet pepper

Competition for freshwater resources, and legal restrictions on discharge of agrochemicals (plant protection products and fertilisers) increase pressure on agricultural practice to improve water-use-efficiency of crop production globally. Zero-discharge greenhouse crop production can be an effective solution to both problems. Preliminary results of experiments with cucumber and sweet pepper on stone wool substrate in two greenhouse compartments showed that productivity did not differ in zero-discharge growing compared to standard growing strategies. In this paper we present the final evaluation of the sweet pepper trial (December 2014-November 2015). In the reference compartment a total amount of 465 m3 ha-1 year-1 (169.3 kg N) was discharged. In the zero-discharge compartment there was no discharge during cropping. The nutrient composition of irrigation and drain water was analysed weekly (compared to two-weekly in reference) and nutrient stock composition was changed accordingly. Drain water was filtered with a flatbed filter (no rinsing water) and upon changes in fertigation, the new fertigation solution was first distributed throughout the entire irrigation system by a circulation pump, before application. An irrigation strategy was developed for the end of the cropping season, aiming to drain substrate slabs and to empty drain tanks as much as possible and reduce the amount of remaining nutrients in the slabs, without compromising productivity. Water-use-efficiency of the zero-liquid discharge strategy could be optimised by steering towards more generative crop growth.

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