EFFECT OF DIFFERENT PLASTIC GREENHOUSE COVERS ON CUT-ROSES PRODUCTION
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.
TESI, R. (1989). EFFECT OF DIFFERENT PLASTIC GREENHOUSE COVERS ON CUT-ROSES PRODUCTION. Acta Hortic. 246, 71-74