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  • Author or Editor: R. E. Widmer x
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Abstract

Most greenhouse operators were unconcerned about warnings of limited fuel supplies until the “oil crisis” of 1973. Suddenly everyone was concerned over increasing prices of oil and natural gas, and more critically over their possible inability to obtain an adequate, steady supply of fuel. Prices increased regularly thereafter but until recently, fear over an adequate supply diminished.

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Abstract

A survey of floricultural education was conducted for presentation at an International Horticultural Congress Workshop in Aug. 1986. Based on discussion at the workshop, data collected were double-checked with contact persons at each college or university, and the revised data are presented herein (Table 1).

Open Access
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Abstract

The genus Cyclamen is a member of the Primulaceae, yet speciation of individual members can be confusing. Cyclamen are very diverse, with several species widely distributed throughout the Mediterranean countries and others indigenous only to specific islands or mainland areas (2, 3). Their foliage is extremely variable. Within a single species leaves may range from orbicular to cordate with entire to dentate margins, and with or without gradations of silver-gray zonal patterns. Flowers may be scented or odorless and range in color from white to deep pink. They either precede or arise after the foliage and reach anthesis during autumn, winter or spring (3, 10). The species persicum is uniquely different in that its fruited peduncles haphazardly bend and twist instead of coiling back to the crown. The coiling may facilitate seed dispersal by ants, but C. persicum has lost the coiling characteristic even though it shares this dispersal vector (5).

Open Access

Abstract

The effects of negative air ions from a high voltage electrical discharge unit on growth and development of 9 plant species were studied in growth chambers and/or in the greenhouse. Treatments consisted of ionization during either the light or dark period, as well as untreated controls. In growth chambers, plants grown in ionized air had significantly greater fresh weights in 13 of 16 instances, but were relatively unaffected in dry weights. Ionization treatments in the greenhouse were less effective but treated plants showed increases in tobacco plant height, geranium stem length and lettuce leaf number.

Open Access

Abstract

A system for greenhouse soil temperature control was designed which combines a moderately wide range of soil temperature above and below air temperature, whole-plot replication, and relatively high numbers of plants per treatment The apparatus was developed for studies involving Cyclamen persicum Mill., but also should be useful for studies of other crops or plant diseases.

Open Access

Abstract

Gibberellin (GA3) treatment of 6 cyclamen cultivars accelerated flowering 28 to 35 days and increased simultaneous flower production per plant up to 100%. Leaf size, leaf count, and plant size were not altered by GA3. A single spray of 50 ppm GA3 applied 60 to 75 days prior to desired time of bloom is suggested to promote more accurate, efficient scheduling of cyclamen crops.

Open Access