ISHS Acta Horticulturae 751: IV International Symposium on Rose Research and Cultivation
QUALITY AND COMMERCIAL GRADE OF ROSE YIELDS AS AFFECTED BY POTASSIUM APPLICATIONS THROUGH DRIP IRRIGATION |
| Authors: | J.G. Barbosa, J.M. dos Santos, J.A. Saraiva Grossi, P.R. Cecon, H.P. Rodrigues, F.L. Finger |
| Keywords: | Rosa multiflora, variety, stem length, oidium |
| Abstract:
This experiment was carried out to evaluate the flower yield and quality of the rose cultivars 'Sônia' and 'Red Success' as affected by different potassium (K) rates supplied by drip irrigation. The K treatments were 0, 30, 60 and 90 g/m2/year, applied to plants arranged in a completely randomized design with four replicates. The cultivar 'Sônia' produced higher number of stems for the commercial (length) grades <30, 30-40 and 40-50 cm. The cultivar 'Red Success' had higher production of 60-70, 70-80 and >80 cm stems. Maximal yield of rose stems with superior quality (>69 cm in length) was obtained with a K application rate of 49.76 g/m2/year. 'Sônia' yielded a higher number of normal, straight stems, with maximal production at K application rates of 50.36 g/m2/year. The cultivar 'Red Success' was more susceptible to oidium (powdery mildew) infection, but increases in K applications produced a reduction of the disease infection. | |
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