Compact Campanula carpatica 'Uniform' Without Chemical Growth Regulators

摘要

Cyclic drought as a single stress factor or combined with low phosphorus (P) and/or low nitrogen (N) availability was tested on plant quality and post-production performance in Campanula carpatica 'Uniform'. Drought stressed plants were irrigated whenthe soil water potential Ψ_s reached below -800 hPa and control plants were irrigated when Ψ_s reached below -200 hPa. The growth substrate was a peat:perlite mixture. Plant height, leaf number, total leaf area, number of flower buds and total fresh and dry weight were reduced by continuous cyclic drought stress and by interrupted cyclic drought stress in combination with either low P alone or a combination of low P and low N. Low N combined with interrupted cyclic drought stress did not reduce plantheight compared with cyclic drought as a single stress factor. Apparently, drought stress combined with low N availability favoured vegetative growth at the expense of reproductive growth, whereas dry matter in low P plants was distributed in favour offlower production. All plants produced with drought stress were more tolerant to a post-production drought stress treatment compared with control plants. Low P availability combined with interrupted drought stress during production improved the post-harvest stress tolerance to a larger extent than growing plants with drought stress and standard P levels.