| 摘要 |
A substrate for plants comprises at least two connected layers, one layer of which comprises a porous polyester material, and the other layer of which comprises another porous material. The water-retaining properties of this layer are better than those of the porous polyester material. The layer of porous polyester material may comprise polyester fibres, preferably polyester fibres which are entangled and/or arranged arbitrarily.
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