ISHS Acta Horticulturae 424: II International Rose Symposium
INFLUENCE OF MOISTURE DEFICIT AND CULTURAL PRACTICES ON TRANSPIRATION OF GLASSHOUSE ROSES |
| Author: | R. de Graaf |
| Abstract:
The most important factors for the transpiration of crops grown under glass are: the moisture deficit between leaf and glasshouse air, the stomatal conductivity and the leaf area. Moisture deficit and stomatal conductivity are especially affected by light intensity, the (glasshouse) air humidity, the carbon dioxide concentration and the (leaf) temperature. These factors also influence one another (Nederhoff et al., 1994). The effect of these factors on the transpiration of rose is being studied during a five-year period (1991 – 1995) at the Glasshouse Crops Research Station (PTG) at Naaldwijk. Apart from the factors just mentioned several other specific factors occur in rose cultivation which may strongly affect the transpiration. One of these is the fact that with the harvest of the flower stems great parts of the leaf area are being removed. In 1994 the effect of the air humidity on the transpiration of roses was studied. Below, some results of this investigation are briefly summarized. | |
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