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Timely production procedures for regal pelargoniums

Timely production procedures for regal pelargoniums

Gb + Gw 86(44): 1648-1651

Twelve cultivars potted on 7 November 1985 were grown under the following temperature regimes: (1) 12 degrees C continuously from potting to flowering; (2) 12-15 degrees during calendar weeks 46-47, 8-10 degrees till week 2 of the next year, and then 12-14 degrees till flowering; (3) 12-15 degrees during weeks 46-47, 8-10 degrees till week 51, and then 12-14 degrees till flowering; and (4) as in regime (3) but from week 51 given 10 h supplementary light (3000 lx) when the natural light level was <3000 lx. Comparing the flowering responses within cultivars, temperature regime (1) usually led to the fewest flowers and umbels per plant, particularly with cultivars Micky, Duett, Fruhlingsgruss and Mozart, but Muttertag produced the most flowers. Cultivar Silvia could not tolerate the extended cool period of regime (2), while this regime was the most favourable for Mozart. Cultivars Aquarell, Milka, Biedermeier and Hostess also flowered well with regime (2). The shorter cool period of regime (3) nearly always produced better flowering than regime (2), but Mozart performed markedly worse. Most cultivars reacted favourably to supplementary light, particularly with increased flower number in cultivars Duett, Ballerina, Hostess and Silvia, and supplementary light advanced flowering by 10 days in cultivars Mikado and Duett.

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