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Validation of crop photosynthesis models for intermittent supplemental lighting in greenhouses plant production

Authors:

Abstract

In Germany, the growing introduction of electricity generated from renewable energy creates variability on electricity tariffs. The present research is based on the idea of taking advantage of low electricity prices for supplemental illumination in greenhouse production. Due to the variation of electricity prices, also the application of the lighting by growers should be flexible. In order to analyze the effect of different application times of supplemental light crop growth models can be used where the photosynthesis sub models describe the central function of the light use efficiency.
VORTRÄGE / SESSION 7 / ANBAUVERFAHREN IM GARTENBAU 2
BHGL-Tagungsband 32/2017 27
Validation of crop photosynthesis models for intermittent supplemental
lighting in greenhouses plant production
Tundra Ramírez1, Hans-Peter Kläring2, Uwe Schmidt2, Ingo Schuch2, Britta Zimmermann3
1 Leibniz Institute of Vegetable and Ornamental Crops, Department of modelling and
knowledge transfer, 14979 Grossbeeren, Germany
2 Humboldt University of Berlin, Faculty of Life Sciences, Division Biosystems Engineering,
Albrecht-Thaer-Weg 3, 14195 Berlin-Dahlem, Germany
3 Fraunhofer Institute for Wind Energy and Energy System Technology,
Königstor 59, 34119 Kassel, Germany
ramirez@igzev.de
In Germany, the growing introduction of electricity generated from renewable energy creates
variability on electricity tariffs. The present research is based on the idea of taking advantage
of low electricity prices for supplemental illumination in greenhouse production. Due to the
variation of electricity prices, also the application of the lighting by growers should be flexible.
In order to analyze the effect of different application times of supplemental light crop growth
models can be used where the photosynthesis sub models describe the central function of the
light use efficiency.
Therefore, two existing photosynthesis models were adapted to the use of artificial illumination
of a tomato crop. To this end, the model predictions were validated using measurements of
crop photosynthesis in a greenhouse. Finally, the models were used to estimate the economic
benefit of the use of volatile current supply for the artificial illumination of greenhouse crops
under the different environmental conditions in the course of the day and the year.
This project is supported by funds of the German Government's Special Purpose fund held at
Landwirtschaftliche Rentenbank.
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