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US 2015/0027052 A1Published application
Plant growth substrates
AssigneeRockwool International A/S
InventorsFrank Hendrikus Peter Janssen, Daan Louis De Kubber
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Abstract
A man-made vitreous fibre (MMVF) plant growth substrate is provided. The substrate has properties including a volume of 3 to 20 litres, two layers of differing density. The height of the two layers lie in the ranges of 25 mm to 50 mm and 50 mm to 100 mm This is found to provide a substrate which allows excellent control of the water and/or nutrient contents within the substrate when used for plant growth.
Claims15
A man-made vitreous fibre (MMVF) plant growth substrate comprising a coherent slab having the following properties:
- (a) a total volume in the range 3 to 20 litres,
- (b) a first layer of MMVF having a density in the range 40 to 90 kg/m3,
- (c) in interfacial contact with the first layer, a second layer of MMVF having a density in the range 35 to 85 kg/m3 that is lower than the density of MMVF of first layer;
- wherein
- said first layer has a thickness in the range of 25 mm to 50 mm, said second layer has a thickness in the range of 50 mm to 100 mm, and the total thickness of the slab is in the range 75 mm to 150 mm, wherein the ratio of first layer thickness to second layer thickness is in the range 1:(1.2-2.5).
2 more elements
Dependencies are inferred from the claim text.