Abstract
Measured and simulated dry-matter production of two rose crops different in cultivar and growing conditions were compared. Differences in dry-matter production between the two crops could be explained to a large extend by differences in harvest index, leaf area index, supplementary lighting and CO2-level Annual dry-matter production was overestimated by a general greenhouse crop growth model extended with a subroutine for supplementary light (ALSIM 1.0). Summer production was largely over-estimated and winter production under-estimated. Differences between instantaneous dry-matter production as simulated and measured as harvesting is discussed dry-matter production and crop efficiency are useful characteristic to compare rose-crops as they eliminate some of the problems related to differences based on cultivar, quality of flowering stems economic parameters and light received at canopy level dry-matter production and crop efficiency can be useful tools for control of crop growth
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