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.

    We have a manual that explains all the features 

Record number 546676
Title Slateelt op water in plastic tunnels en onder glas met LED-licht : teelt de Grond uit, onderzoek 2014-2017
Author(s) Janse, Jan; Weerheim, Kees; Vermeulen, Tycho
Source Bleiswijk : Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw (Rapport Wageningen Plant Research 813) - 46
Department(s) GTB Teelt & Gewasfysiologie
Publication type Research report
Publication year 2018
Abstract A shift occurs in leaf crops from field cultivation to cultivation in plastic tunnels and glass greenhouses. As part of the research program ‘Teelt de Grond uit’, funded by Dutch Topsector Horticulture, WUR Greenhouse Horticulture conducted research into the optimization of lettuce cultivation on water in a plastic ‘cabrio’ tunnel greenhouse with LED lighting. High-quality lettuce could be grown, but especially in the case of iceberg lettuce, the growing season was too long in the winter season. The growth of lettuce was stimulated by a higher light intensity of the LEDs, higher room and water temperatures and the addition of a bio-stimulant. A higher plant density gave smaller heads, but more kilos per unit area. In follow-up research in a glass greenhouse, very fast cultivation was realized by applying a lot of LED grow light, high temperatures, humidification and a high CO2 content. The average cultivation time from sowing to harvesting in the dark months of the year was about 40 days. With this cultivation method, 3 times more lettuce heads could be harvested than in a cultivation of heavy lettuce without lighting. A problem was the regular occurrence of tipburn. There were clear differences between lettuce types and cultivars. A very high RH in the night largely prevented the occurrence of tipburn in the final phase of cultivation. The cost price of this cultivation method approaches that of the cultivation of heavy lettuce in the soil.
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