New PDF release: Advances in Food-Producing Systems For Arid and Semiarid

By Jamal T Manassah; Ernest J Briskey; Muʼassasat al-Kuwayt lil-Taqaddum al-ʻIlmī

ISBN-10: 0124673015

ISBN-13: 9780124673014

ISBN-10: 0124673023

ISBN-13: 9780124673021

ISBN-10: 012467321X

ISBN-13: 9780124673212

ISBN-10: 0124673228

ISBN-13: 9780124673229

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Extra resources for Advances in Food-Producing Systems For Arid and Semiarid Lands, Part B

Sample text

In no country other than the United States, are there large numbers of commercial hydroponic cultural systems. Nutrient Film Technique (NFT) This was the first real breakthrough for a completely automated feeding system in the production of crops under protected environments. The system may be used either under covered structures or in the open. It had its origin at the Glass­ house Crops Research Institute in Littlehampton, England. The term NFT was coined to emphasize that the depth of the liquid flowing in the plastic tube or gully was extremely shallow — little more than a film (Figure 9).

Worldwide, there were approximately 5,000 acres under drip irrigation in 1970, mostly in Israel and Australia. By 1974 this had grown to 72,000 acres in the US (half of which was in California) and 140,000 globally. Figures for the US in 1978 approached 350,000 acres and worldwide about 550,000. It is projected that for 1980 there will be 500,000 acres in the US with over a million worldwide. Most of the installations in the United States are now found in California, Hawaii, Texas, Florida, Arizona, and Michigan.

Parasite control of red spider mite is being widely used, while the control of white fly has been more difficult, since it re­ quires careful timing in the introduction of the parasite to the white fly popu­ lation. For the control of the white fly, the parasite wasp, Enoavs'ia formos, is introduced into the greenhouse when the white flies begin to lay their eggs. The parasite nymphs may also be introduced as soon as the first flies are seen. The parasitic wasp deposits her eggs in the nymphs of the white fly.

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Advances in Food-Producing Systems For Arid and Semiarid Lands, Part B by Jamal T Manassah; Ernest J Briskey; Muʼassasat al-Kuwayt lil-Taqaddum al-ʻIlmī

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