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  • Author or Editor: Richard T. Poole x
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Abstract

Christmas cactus (Zygocactus truncatus Schum cv. Christmas Cheer) can be forced into bloom during the hot (22°C minimum - 32 maximum) summer months of Central Florida when placed under short day (8 AM - 5 PM) for 6 or more weeks. Plants bloomed 9-14 weeks after placement in short days and bloomed for 4-8 weeks after first flower opening.

Open Access

Abstract

Fertilizer levels of 500-220-400 and 750-330-600 mg/liter N-P-K reduced growth of Brassaia, Chamaedorea and Peperomia when compared to 250-110-200 mg/liter but had no effect on Philodendron and Maranta. As fertilization level increased, pH of the leachate decreased and soluble salts increased. As fertilizer level increased, leachate increased from pots with Brassaia and Peperomia and to a lesser extent from Maranta and leachate from Philodendron and Chamaedorea were similar. Fertilizer of 800-360-680 mg/liter N-P-K reduced fresh weight and root grade of Peperomia and Brassaia. Amount of leachate doubled as fertilizer and volume of water applied increased.

Open Access

Abstract

Weekly applications of 12.5—37.5 mg N/10 cm pot, 5—50 mg P and 25—50 mg K produced good growth of the Maidenhair fern. Elemental composition (% dry weight) of these fern were: N (1.9—2.3), P (0.28—0.43), K (2.3—2.8), Ca (0.11—0.14) and Mg (0.27—0.35).

Open Access

Abstract

Aglaonema commutatum Schott. ‘Silver Queen’, Ficus benjamina L., Peperomia obtusifolia (L.) A. Dietr. ‘Marble’ and Chamaedorea elegans Mart, were grown in a glass greenhouse under 15 klx of light maximum in black, white or clear 15 cm diameter containers that transmitted 0, 5 or 14 klx maximum respectively at perimeter of root ball. Visual root grades of Ficus and Peperomia were not influenced by treatment, but those of Aglaonema and Chamaedorea were lower at 5 or 14 klx light. Fresh weight of tops and roots of the 4 foliage plant species were not affected by treatments.

Open Access

Abstract

Foliar mottling on mature leaves and reduced plant quality often occurs on Dracaena fragrans (L.) Ker-Gawl. cv. Massangeana after transfer to an interior environment. Best plant quality was obtained when single superphosphate was omitted from the potting medium, dolomite was included and plants were grown with the equivalent of 667 kg N/ha (3700 kg Osmocote 18N-3P-10K). Mottling was most severe when plants received single superphosphate and the equivalent of 1000 or more kg N/ha (5550 or more kg Osmocote 18N-3P-10K). In the second experiment, single superphosphate also increased severity of mottling during interior maintenance period and addition of dolomite to the potting medium did not lessen the severity.

Open Access

Abstract

Highest quality Dracaena angustifolia ‘Honoriae’, were produced under 26 klx at all fertilizer levels and 52 klx at 12 or 16 g Osmocote 18N-3P-10K/20 cm diameter pot for 4 months. After 7 months under an interior environment, plants that received 78 klx in the production area and held under 1 klx interior light dropped more than twice the number of leaves as the other plants. Several interactions of light and fertilizer levels are discussed.

Open Access

Abstract

Pittosporum tobira (Thunb.) Ait. and Pittosporum tobira (Thunb.) Ait. cv. Variegata were grown under various light and nutritional levels and then placed in an interior environment under 2 light levels. As production light levels decreased, plant height and width and leaf size increased for both cultivars. Fertilizer had no effect on plant height or leaf size and slightly increased width of green pittosporum. A decrease in production light intensity greatly improved plant color and grade while increased fertilizer slightly improved leaf color of both cultivars and plant grade of variegated pittosporum. Treatment effects were essentially the same after 6 months indoors.

Open Access

Abstract

Grade and color of the bromeliad, Aechmea fasciata, improved with increased N. Increased K fertilization increased grade but decreased color. Phosphorus had no effect. Placement of the fertilizer solution and water in the vase of the bromeliad was not essential for the production of quality bromeliads under greenhouse conditions.

Open Access

Abstract

Greenhouse-grown ‘Dania’ aphelandra receiving 0.9 kg N, 0.4 kg P and 0.8 kg K/100 m2 per month were as tall as plants receiving 2 or 3 × levels and general appearance was equal. Plants watered daily or semi-weekly were larger than those watered weekly. Best plants after 8 weeks indoors under 0.8 klx of cool white fluorescent light for 12 hours daily were those produced on the lowest fertilizer level or those watered daily at any fertilizer level. Soluble salts measured on a 1.2 by volume basis at experiment termination indicated high plant grade was associated with salts levels generally below 1000 ppm.

Open Access

Abstract

Height and number of shoots of both cultivars increased, and color of leaves improved with increased nitrogen. Increased potassium fertilization slightly increased number of shoots but did not affect height or leaf color.

Open Access