Greenhouse Microclimate as Influenced by Poly Film Covers and Its Effect on Growth of Rose Cut Flower (Rosa hybrida spp.) Cultivars

G. Oloo-Abucheli


Greenhouse covering diffuses light that reaches the plant canopy. The diffused light has been found to be advantageous since it prevents shadow formation and enhances light penetration. A myriad of greenhouse covering material have been developed for this purpose. However, spectrum properties and their effect on plant growth are continuously being discovered under different conditions. A field study was conducted in 2012/2013 in a growth tunnel to investigate the effect of UVA 205/N, UV-A milky white and IR-504 poly films on growth of two rose cultivars under natural conditions. The research was carried out under a split plot experiment laid down in a completely randomized block design. The covers exhibited differences in microclimate (greenhouse air temperature, relative humidity and photo synthetically active radiation). The amount of PAR recorded was high under UV-A milky white poly film compared to the coloured IR-504 and UV-A 205/N. Long grades of rose cut flower were obtained under UV-A 205/N cover which received low PAR compared to those grown under UV-A milky white and IR- 504. UV-A 205/N had high dry matter accumulation for both stem and flower heads. Dry matter accumulations of plants grown under UV-A clear and IR-504 were not significantly different. Temperature and relative humidity varied significantly (P<0.05) under different poly films, these differences had implication on the stem length of rose cut flower. It is evident from the study that UV-A 205/N and IR-504 poly film enhanced production of longer rose cut flower stems compared to UV-A milky white.






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