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Title: Retention of ions by vocanit sand used in hydroponic cultures
Authors: Luque-Escalona, Angel 
Keywords: Hidropónica
Suelos volcánicos
Issue Date: 1982
Abstract: Volcanic sands were treated with nutrient solutions for a period of six weeks and were washed with deionized water (until constant conductivity) for several weeks. These basaltic materials had been used in commercial hydroponic cultures for 6-, 5-, 4-, and 1 year, while another, as control, had not been used before. The activity of the materials on the NH+4-, NO-3-, H2PO-4-, K+-, Ca++-, Mg++, and Na+ contents of the nutrient solution was examined. All material had retention of NH+4 and H2PO-4, and released K+, Ca++, Mg++ and Na+. The non used material is the one which had the lowest activity in the nutrient solution composition. The pH of the material decreased about 1 unit (from 8 to 7). The NH4-Acetate extractable Ca++, Mg++, and Na+ and the NaHCO3 extractable P increased after treatments. There was also a nitrification of the NH+4 retained, increasing the NO-3 in the nutrient solutions except in the non-used material.
ISBN: 90-66050-51-9
ISSN: 0567-7572
DOI: 10.17660/ActaHortic.1982.126.8
Source: Acta Horticulturae [ISSN 0567-7572], n. 126, p 57-64
Symposium on Substrates in Horticulture Other Than Soils in Situ, Angers, France, 31 August-5 September, 1981 (Acta horticulturae)
Appears in Collections:Actas de congresos
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