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ISHS Acta Horticulturae 566: II International Symposium on Application of Modelling as an Innovative Technology in the Agri-Food Chain; MODEL-IT

MODELLING YIELD AND PRODUCT QUALITY OF BROCCOLI AS AFFECTED BY TEMPERATURE AND IRRADIANCE

Authors:   H.P. Kläring, I. Schonhof, A. Krumbein
Keywords:   Brassica oleracea L. var. italica, glucoraphanin, dry matter, model, yield
DOI:   10.17660/ActaHortic.2001.566.8
Abstract:
A model was developed to predict the effects of environmental conditions on growth, yield and quality characteristics of broccoli. As an example of a quality characteristic, the content of the glucosinolate glucoraphanin - an important health affecting compound in broccoli - was estimated. Carbohydrates produced by photosynthesis are transformed into different substances of the biomass at different carbohydrate use efficiencies depending on the ratio of available carbohydrates to potential crop growth, or related state variables. Parameters were estimated and the model was tested based on experiments in greenhouses at different levels of temperature and irradiance. The model explained a large part of the variation in total plant dry matter (94%), yield (72%), dry matter content (73%) and glucoraphanin content (79%). However, the model is still a prototype and needs further development with respect to its validity under field conditions, the addition of further quality characteristics and the addition of further environmental effects.

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