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 37967
Title Modelling the effect of supplementary lighting on production and light utilisation efficiency of greenhouse crops.
Author(s) Koning, J.C.M. de
Source Acta Horticulturae 418 (1997). - ISSN 0567-7572 - p. 65 - 72.
Department(s) Horticultural Supply Chains
Publication type Non-refereed article in scientific journal
Publication year 1997
Abstract The effect of supplementary lighting (SL) on dry matter production of greenhouse crops is predictable with ALSIM, a new crop growth model based on SUCROS87. The light utilization efficiency (LUE), defined as daily dry matter production divided by the daily photosynthetic photon flux is a parameter for evaluating the quantitative effect of light on dry matter production. In winter in the Netherlands the LUE is raised by SL, especially by lighting in the natural dark hours. In summer there is hardly influence of SL on the LUE for the simulated growth of a fictitious crop. In winter the leaf area index (LAI) combined with biomass has a great influence on the LUE. Without SL the LUE is already negative at LAI above 2.3, due to a higher respiration than assimilation. SL makes it possible to produce dry matter at higher LAI values. Supplying CO2 in the greenhouse can partially compensate a light shortage. A combination of CO2 and SL can raise the LUE more than the sum of the separate effects. ALSIM is valuable for predicting growth in many situations for many crops if specific crop parameter values are available.
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