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  • Author or Editor: B. K. Harbaugh x
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Abstract

‘Floriana Mist’ and ‘Floriana Cascade’ gypsophila (Gypsophila paniculata L.) are selections of Gypsophila ‘Bristol Fairy’ (Caryophyllaceae), the double-flowered Baby's Breath used in floral arrangements. These clones were selected because of consistent flowering when rooted cuttings were planted from September through February in central Florida. Inconsistent flowering of commercial cuttings of ‘Bristol Fairy’ when planted during short days (<12 hr light) and cool nights (10° to 15°C) led to the selection of clones which would flower consistently, independent of planting date. ‘Floriana Mist’ and ‘Floriana Cascade’ have performed well in commercial field trials in Florida and California from 1977 to 1981. They were released cooperatively by the Univ. of Florida and Purdue Univ. in 1983.

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Concerns over the environmental impact and economics of harvesting sphagnum and reed-sedge peat have increased the desire to identify acceptable peat substitutes for use in container substrates. This preliminary study evaluated the use of composted dairy manure solids as a substitute for sphagnum or reed-sedge peat in container substrates for production of woody ornamental shrubs and assessed potential leaching of nutrients. Walter's viburnum (Viburnum obovatum), sandankwa viburnum (Viburnum suspensum), and japanese privet (Ligustrum japonicum) were grown in 3-gal plastic containers with seven substrates containing (by vol.) 60% pine bark, 10% sand, and 30% sphagnum peat (S), reed-sedge peat (R), and/or composted dairy manure solids (C). Substrate composition had no effect on plant quality ratings for any species, growth index (GI) of walter's viburnum, or shoot and root dry weight of walter's viburnum and japanese privet. However, the GI of japanese privet and sandankwa viburnum was the lowest when grown in substrates containing a high percentage of reed-sedge peat (0S:3R:0C). Substrate effects on average nitrate + nitrite nitrogen leachate losses were minimal over the 88-day leachate collection period. However, the substrate containing the highest proportions of composted dairy manure solids (0S:0R:3C) generally had the highest average ammonium nitrogen and dissolved reactive phosphorus losses compared with other substrates. All substrates tested as part of this study appeared to be commercially acceptable for production of container-grown woody ornamental shrub species based on growth and quality. However, average nutrient losses from containers differed depending on the peat or peat substitute used to formulate the substrates.

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