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 354850
Title Transpiration of glasshouse rose crops: evaluation of regression models
Author(s) Baas, R.; Rijssel, E. van
Source In: III International Symposium on Models for Plant Growth, Environmental Control and Farm Managementin Protected Cultivation (HortiModel 2006) ISHS - ISBN 9789066056091 - p. 547 - 556.
Department(s) Wageningen UR Greenhouse Horticulture
Publication type Contribution in proceedings
Publication year 2006
Abstract Regression models of transpiration (T) based on global radiation inside the greenhouse (G), with or without energy input from heating pipes (Eh) and/or vapor pressure deficit (VPD) were parameterized. Therefore, data on T, G, temperatures from air, canopy and heating pipes, and VPD from both a lysimeter experiment and from a cut rose grower were analyzed. Based on daily integrals, all T models showed good fits due to the dominant effect of global radiation G (solar + supplementary radiation) inside the greenhouse on T. Similar G-T relations on high-light and low-light days indicated identical effects of solar radiation and radiation from supplementary light on T. For both data sets, similar regression coefficients of 0.3 l/MJ were obtained with models including G and VPDair, G and Eh, or G and a constant intercept. Including the difference between saturated pressure at leaf temperature and air vapor pressure (VPDleaf-air) did not improve the regression models. G accounted for 74% of latent heat transfer. The contribution of heating underneath the canopy on T was investigated by switching off the heating on days during the winter period, and was on average 13% or 0.2 l/m².day for an extra energy input by heating pipes of 3 MJ/m².day. Therefore, the efficiency of sub-canopy heating was smaller than 0.07 l/MJ, less than 23% of the efficiency of global radiation.
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