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Title: Physical and physicochemical properties of the volcanic materials used in hydropony
Authors: Luque-Escalona, Angel 
Keywords: Hidropónica
Issue Date: 1982
Abstract: The physical and physicochemical properties of volcanic (basaltic) materials used in hydropony are treated. These materials have a real density of 2.93 g/ml and an apparent density of 0.84 g/ml. The relationship between both densities gives a total theoretical porosity of 71.3 % (v/v). The maximum hydric capacity of these materials was of 63.2 %(v/v) and the difference to the total theoretical porosity (8.1 % v/v) is the occlusive porosity which is considered as a reference for evaluating the extent of disintegration of the particles. The water retention was of 18.6 %, two times greater than that of the gravel. The exchangeable cationic capacity is very low (5 meq/100 g) and the pH of the materials ranges between 7 and 8 units.
ISBN: 90-66050-51-9
ISSN: 0567-7572
DOI: 10.17660/ActaHortic.1982.126.7
Source: Acta Horticulturae [ISSN 0567-7572], n. 126, p. 51-56
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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