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Titolo:
Effects of slow sand filtration on mineral and inoculum concentration of nutrient solution in a NFT system
Autore:
Mine, Y; Inanaga, S; Sakiyama, R; Saka, H;
Indirizzi:
Univ Tokyo, Fac Agr, Univ Farm, Tanashi, Tokyo 1880002, Japan Univ Tokyo Tanashi Tokyo Japan 1880002 arm, Tanashi, Tokyo 1880002, Japan Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan Tottori Univ Tottori Japan 6800001 Land Res Ctr, Tottori 6800001, Japan Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 Sch Agr & Life Sci, Tokyo 1138657, Japan
Titolo Testata:
JOURNAL OF THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE
fascicolo: 3, volume: 69, anno: 2000,
pagine: 323 - 331
SICI:
0013-7626(200005)69:3<323:EOSSFO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
JPN
Keywords:
disinfection; NFT; recirculating nutrient solution; slow sand filtration; soilless culture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Mine, Y Univ Tokyo, Fac Agr, Univ Farm, Midori Cho, Tanashi, Tokyo 1880002, Japan Univ Tokyo Midori Cho Tanashi Tokyo Japan 1880002 o 1880002, Japan
Citazione:
Y. Mine et al., "Effects of slow sand filtration on mineral and inoculum concentration of nutrient solution in a NFT system", J JPN S HOR, 69(3), 2000, pp. 323-331

Abstract

The applicability of slow sand filtration as a disinfection system for therecirculating nutrient solution in a Nutrient Film Technique (NFT) growingtomato was evaluated. The recirculating nutrient solution was filtered through a slow sand filter installed between the nutrient solution tank and the culture bed; the filtrate was supplied to the hydroponic system. The pH of the filtrate was maintained at around 7 by the buffer action of the filter sand. The dissolved oxygen concentration in the nutrient solution decreased by 10 similar to 30% through filtration; but the tomato plants did not show any O-2 deficiency symptoms. The influence of sand filtration on electrical conductivity (EC) value was small. Nitrate- N and Mg concentrations in the nutrient solution declined slightly by filtration; part of K in the solution was seemingly exchanged by Ca, previously held by the sand. NN4- N, P, Fe and Mn concentrations in the filtrate did not change quicklyafter their addition to the water layer. Mn in the filtrate was undetected. Young leaves of tomato plants grown in NFT with this slow sand filtration system became yellow, indicating that some micronutrient, probably Mn, was deficient. The slow sand filtration system removed most fungi and bacteria added to the NFT tank. The maximum concentration of Fusarium oxysporum detected in the filtrate was about 0.1% of that in the tank; 0.6% for Pseudomonas solanacearum. Escherichia coli was not detected in spite of the initial concentration of 2.0 x 10(6) cfu . ml(-1) in the tank. The top layer of about 1cm thick from the sand layer was scraped bimonthlyto re-establish the original filtration rate.

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Documento generato il 19/09/20 alle ore 09:09:57