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Influence of Four Cultural Systems upon Geranium Stock Plant Productivity


Rooted Pelargonium ×hortorum L.H. Bailey ‘Yours Truly’ and ‘Irene’ geranium cuttings were planted 15 Oct. in raised beds, 11.3 liter plastic pots, 85 liter poly bags, or nutrient film systems within 2 double poly greenhouses. In one greenhouse, high pressure sodium (HPS) lamps supplemented natural light (86 µmol s-1m-2 ± 10 µmol s-1m-2) from 0800 to 2400 hr and in the other greenhouse light was not supplemented. Ambient carbon dioxide levels were enriched with an additional 300–600 ppm of carbon dioxide during daylight hours in the greenhouse without supplemental lighting and during lighted hours in the greenhouse equipped with HPS lights. Cutting number, dry weight, basal stem caliper, and the length of roots produced on harvested cuttings were recorded from 18 Nov. to 3 Jan. There were no differences among cultural systems for any of the parameters measured under natural daylight conditions. When supplementary HPS lighting was utilized, differences in number of cuttings produced and cutting dry weight were apparent, with NFT grown stock plants being the most productive. Growth differences between cultivars were evident for all parameters measured. Treatment of the stock plants was not observed to affect rooting response of cuttings.