DE2063715A1 - Improved substrate for soilless plant culture - Google Patents

Description

FARBENFABRIKEN BAYER AG

LE VE RKU S E N - Bayerweik Fatent department Wr / Scht

2 3rd OfZ. 7970

Improved substrate for soilless plant culture

The use of synthetic foams as a substrate for soilless plant culture is already known. So m

For example, German patent specification 1 018 077 describes the use of synthetic resin foams Aminoplasts, phenoplasts or melamine resins as a carrier layer for soilless plant cultivation. Also the use of polyurethane foams for this area of application is already known (German patent specification 1,299,662).

As has now surprisingly been found, the formation of root systems, the root formation (rooting rate) and root spread in cuttings as well as the radicle formation from germinating seeds in such foam substrates can be significantly increased if a dark or. Black- M

coloring of the foam substrates prevents light from entering the root space of the plant. The cause of this surprising effect (obviously in the fact that a negative influence of the root-promoting active ingredients by exposure to light is excluded.

The present invention is thus a rsrbessertes substrate for soil-less plant culture, characterized in that it consists of a dark, preferably black-colored hydrophilic open-cell foam of density 8-50 kg / m '.

Le A 13 330 - 1 - ■

20 9829/0172 bad ORIGINAL

The production of the improved, that is to say dark or black colored, foam substrates according to the invention can be done both by subsequent coloration of the finished. Substrates, for example, by soaking them with a dye solution or also by using dark color pigments during the production of foam. The principle of the dark coloration according to the invention can be used with apply any display substrate. However, polyurethane foam substrates from dark to black are particularly easily accessible, since one of the components used to produce the foam is sufficient for this purpose to paste preferably carbon black with a suitable pigment. For example, a black colored Polyurethane substrate can be made by applying according to known methods of polyurethane foam Polyol component used in the manufacture mixed with carbon black is and then in a known manner with polyisocyanates, blowing agents, stabilizers, catalysts and if necessary, other additives to the foam is set.

Preferred as a plant substrate are dark or Dyed black © offe & cellular hydrophilic polyurethane foams with a density of 6 - 50, preferably 10 - 15 kg / m.

In practice it is preferred to use suitable foam, substrates are those whose surface is covered by one for the Plant easily permeable, ie evaporation of mass strongly reducing plastic, rubber or paraffin film is provided.

The improved foam substrates according to the invention are preferred in the form of cubes or cuboid bodies used ,, which are arranged on trays, the side walls "the necessary water-rising capacity in the seam material are adapted.

Le A 15 330 - 2 -

209829/0172

BAD ORiGiNAi.

example 1

It is a hydrophilic polyurethane foam according to German Patent application P 20 04 518.5 (Example 1) on the volume weight

14 kg / m ^ produced (type 1). The same approach is used with 1.5 Parts of synthetic carbon black, which are pasted in the polyol component, added and foamed (type 1 a).

The propagation of chrysanthemum cuttings yielded after

15 days in an attempt with 6 repetitions Result, using composite cube panels, the individual substrate blocks of which had dimensions of 4 x 4 x 4 cm became:

Type 1: rooting rate 35% Type 1 a: rooting rate 77%

Example 2

It is a hydrophilic polyurethane foam according to German Patent application P 20 04 518.5 (example 2) produced with a volume weight of 12 kg / m (type 2). The same approach is used with 1.5 Parts of synthetic carbon black, which are made into a paste in the polyol component, are added and foamed (type 2a).

The propagation of chrysanthemum ticks gave the following result after 15 days in an experiment with 6 repetitions, using composite cube panels, the individual substrate blocks of which had dimensions of 4 x 4 x 4 cm:

Type 2: Rooting rate Type 2 a: Rooting rate 66jl

Le A 13 330 - 3 -

209829/0172

Example 3

It is a hydrophilic polyurethane foam according to German Patent application P 19 40 182.2 (example 3) produced with a volume weight of 9.0 kg / nr (type 3). The same approach is used with 1 part synthetic carbon black that is pasted into the polyol component, offset and foamed (type 3a).

The propagation of fuchsia cuttings yielded after Days in an experiment with 5 repetitions «the following result, where composite cube panels, their individual substrate blocks Dimensions of 3x3x4 (height) cm were used became:

Type 3: Rooting Rate $ 73 Type 3 a: rooting rate $ 94

Le A 13 330 - 4 -

209829/0172

Claims (1)

Claim Improved substrate for soilless plant culture, characterized in that it consists of a dark, preferably black, hydrophilic open-cell foam with a density of 8-50 kg / m ⁵ . Le A 13 330 - 5 - 209829 / Ü172