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Growth and Nutritional Status of Rosa 'Mariandel®' Cultivated in Two Potting-Media
Y. Amha and H. Bohne
European Journal of Horticultural Science
Vol. 74, No. 5 (October 2009), pp. 234-239
Published by: Verlag Eugen Ulmer KG
Stable URL: http://www.jstor.org/stable/24126837
Page Count: 6
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A pot experiment was conducted to compare the growth and nutritional status of Rosa 'Mariandel®' grown in media containing slightly decomposed Sphagnum peat [peat] and a mixture of 60 % peat and 40 % substrate-compost [v/v, peat-reduced]. Both media received Osmocote (15N-4P-7.5K-l.8Mg) at N rate of 0.8 g L-1. Plant and media samples were taken at potting and after 6,12,18, and 24 weeks. Most physical and chemical properties differed significantly (P ≤ 0.05) between media types. However, the media had limited or no effect on non-destructive plant measurements including diameter at the base of old shoots, length of longest new shoots, number of flowers and new shoots, crown volume, leaf colour, and disease incidence. Plants grown in the peat-reduced medium, however, produced greater dry mass and had a higher K concentration and content in flowers, roots, old and new shoots. In contrast, the concentrations and contents of N and Mg were higher in the peat-grown plants with no significant difference in P. Therefore, amending peat with 40 % substrate-compost [type I] resulted in plants with similar growth appearances as compared to the pure peat but differed in the nutritional status.
European Journal of Horticultural Science © 2009 Verlag Eugen Ulmer KG