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Expanded clay-a new substrate for roof gardens

Expanded clay-a new substrate for roof gardens

Proceedings International Congress on Soilless Culture, International Society for Soilless Culture: 145-152

Broken expanded clay 4/8 mm has proved to be a useful substrate for roof gardens. Deciduous shrubs and conifers grow best in layers of 25 cm, whereas for low growing shrubs a 10 cm layer is sufficient. When the maximum water accumulation in summer amounts to 1/3 or 1/2 of the substrate layer, rainfall can provide th plant's water supply. Irrigation is only necessary during long drought periods. The nutrient requirements of the plants can be satisfied by slow-release NPK-fertilizers.

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Accession: 001831283

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