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Revista de Ciencias Agrícolas
Print version ISSN 0120-0135
Abstract
ALBORNOZ B., Cesar; SILVA P., Amanda and TORRES M., Francisco. Fertigation with silicon in rose varieties on severity of powdery mildew(Sphaerotheca pannosa var. rosae). Rev. Cienc. Agr. [online]. 2016, vol.33, n.2, pp.84-94. ISSN 0120-0135. https://doi.org/10.22267/rcia.163302.55.
The research evaluated the Fertigation with silicon in the severity of the powdery mildeo (Sphaerotheca pannosa var. Rosae) in three varieties of rose under greenhouse. The experiment was a split-split plot design with silicon doses (SiO2)(DS) as the main-plot factor: (DS1=3mgL-1), (DS2=6mgL-1) and (DS3=9mgL-1); Fertigation (L) as the sub-plot factor: (L1=3 mmdía-1), (L2=5 mmdía-1) and rose varieties (V) as the sub-sub-plot factor: (V1 = Vendela), (V2 = Reed Unique) and (V3 = Miracle). There were differences (p=0.01) due to the effect of SD (silicon dose), L (fertigation) and V (varieties); As well as the DS * L interaction (p=0.01). DS3 applications reduced fungus severity (20%) while DS1 was less efficient (230%). Lower percentages of fungal severity were obtained with Fertigation L1 (130%) and while L2 had the higher (280%). Varieties V2 and V3 were less affected by fungus (170 and 160%) while V1 was more susceptible to it (320%). The DS3 dose and the L1 fertigation interaction reduced fungal severity (75%) (p=0.05). The behavior of the Miracle and Reed Unique rose varieties with a 3mm.day-1 fertigation and a silicon dose of 9mgL-1 could be key to decreasing the severity of Sphaerotheca pannosa var. Rosae in flower growing areas of Colombia.
Keywords : Fungus; greenhouse; nutrition; relative humidity; temperature..