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  • Author or Editor: Philip E. Parvin x
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Ornamental Proteas 1 : New Cut Flower Crop

Abstract

β€œIs it real?” is the usual question. Yes, pincushion protea, Leucospermum cordifolium (Salisb. ex Knight) Fourcade is the first of the ornamental proteas to be grown in quantity as a cut flower in the United States.

Open Access

Abstract

Terminal cuttings of Protea neriifolia R. Br. gave earlier rooting and superior rooting index values when they received basal pretreatments of combinations of (2-chloroethyl)phosphonic acid (ethephon) at 300 ppm and indoleacetic acid (IAA) at 4000 ppm followed by a commercial rooting preparation composed of 1.0% indolebutyric acid (IBA) plus 0.5% NAA diluted 1:9 and combinations of 2500 or 4000 ppm butanedioic acid mono-(2, 2-dimethylhydrazide) (daminozide) with 4000 ppm of IBA or IAA. Treatment effects were evident after 3 and 4 months while the control required 5 to 6 months for similar rooting results.

Open Access

Abstract

In South Africa, proteas are a popular cut flower featured in garden shows and available at most flower shops. They are exported to Europe and the British Isles where their popularity is increasing. The National Botanic Gardens of South Africa at Kirstenbosch, and the King's Park and Botanic Garden in Western Australia, have been instrumental in bringing into cultivation the ornamental species of Proteaceae native to their regions of the world.

Open Access

Abstract

The response of 9 vegetable crops to P concn in the soil solution was determined in field studies on soils with a relatively high capacity for immobilizing P. Adjusted P concentration in the soil solution ranged from 0.003 ppm, doubling at each level, to 1.6 ppm. Most crops produced maximum yields at 0.2 to 0.3 ppm P in soil solution, although transplanted head cabbage (Brassica oleracea L. Capitata Group) and sweet potato (Ipomoea batatas (L.) Lam) produced maximum yields at 0.04 and 0.1 ppm, respectively. At suboptimal P concentration in soil solution, crop response varied greatly. Sweet potato produced about 70% of maximum yield, while lettuce (Lactuca sativa L.) produced about 1% of maximum yield. P levels in plant tissue at 95% of maximum yields ranged from 0.3% in lettuce to 0.7% in Chinese cabbage (Brassica campestris L. Pekinensis Group).

Open Access