ISHS Acta Horticulturae 246: International Symposium on Protected Cultivation of Ornamentals in Mild Winter Climates
EFFECT OF DIFFERENT PLASTIC GREENHOUSE COVERS ON CUT-ROSES PRODUCTION |
| Author: | R. TESI |
| Abstract:
Roses of the cv 'Baccara' were grown under 8 m wide cold plastic tunnels, using four different covers. The production results of the 2nd year were examined. The covers were: PRFV 5 years old; PVC Ondex translucid 2 years old; PE+EVA film 2 years old; PVC Ondex crystal 5 years old. The plants production decreased only when the light transmission of the covers fall to 54.1% at .55 micron, corresponding to about 40.5% of solar radiation. With the same total light trasmission (translucid and crystal PVC sheet) the increasing of diffused light lowered the maximum air temperature and improved cut roses quality. The PE+EVA film gave good production and quality but the highest R.H. and water dripping increased the problems of Coniothyrium control. | |
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