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Thanks to the following people for contributing to this paper: Professor Margaret Burchett, Faculty of Science, University of Technology, Sydney, Margaret Armstrong, Horticultural Therapy Association of Victoria, Cynthia Carson, Department

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technique, and in 1923, Watanabe described the oblique splice graft ( Suzuki, 1972 ). Bravenboer’s work in 1962 seem to be the origin of horticultural grafting in solanaceous plants ( Louvet, 1974 ). From the special phytotechnic perspective, in horticulture

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The function of silicon in horticultural crops is not well understood, primarily because silicon is not considered an element essential for plant growth as indicated by the “criteria of essentiality” defined by Arnon and Stout (1939) ( Epstein

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111 WORKSHOP 11 (Abstr. 938–942) Specialized Production and Utilization of Horticultural Crops in Korea

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The world’s fruit industry is based on distinct clones that have uniquely desirable horticultural characteristics. The genetic improvement of fruits known as fruit breeding in its broadest sense has an ancient tradition that dates back to the

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84 WORKSHOP 11 Teaching Horticulture in Changing Times

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Oral Session 2— Consumer Horticulture & Master Gardeners 27 July 2006, 2:00–3:30 p.m. Nottoway Moderator: Richard Durham

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84 WORKSHOP 11 Teaching Horticulture in Changing Times

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Abstract

The pecan (cover photograph) is one of the major horticultural crops grown in Louisiana. Approximately 25 million pounds of nuts were harvested during the 1975 season. Other major stategrown horticultural crops include sweet potatoes, potatoes, tomatoes, peaches, strawberries, hot peppers, citrus and various florist and nursery crops. Participants in the 73rd Annual Meeting of the American Society for Horticultural Science to be held at Louisiana State University, Baton Rouge, on August 11-14, 1976 will have an opportunity to visit areas where many of these crops are produced and to visit hot pepper and sweet potato processing plants.

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The solid waste streams specific to soilless horticulture (substrate slabs, propagation cubes, and plastic films to cover the soil and to wrap the substrate slabs) were determined quantitatively and qualitatively, while methods to reduce these waste streams without yield loss were evaluated in a case study applied to the Flanders region of Belgium and based on an explorative inquiry among horticulturists. Rockwool used for substrate slabs and propagation cubes was found to be by far the most important waste stream. The use of long-lived, polyurethane (PUR) slabs could reduce the total slab waste stream by ≈90%. Moreover, if substrate blocks are used instead of slabs, this reduction could even increase to 95%. The introduction of new cultivation techniques could further reduce the required volume of substrate slabs. Rockwool propagation cubes could be successfully replaced with peat pots that can be composted after 1 year of use. The reuse of plastic films to cover the soil or to wrap the substrate slabs cannot be considered because of the danger of plant diseases. Due to the susceptibility of these films to contamination, they cannot yet be recycled on a large scale. The use of thinner films and the cultivation on profiled concrete floors were found to allow drastic reductions (of up to 80%) of the quantity of plastics used.

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