EP0361955A2
Expired / Lapsed
EP
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Hydroponic crop production
Assignee: Solvay Interox Ltd
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Filing: 1989-09-29
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Granted: —
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Expires: 2009-09-29
Abstract
Abstract Hydroponic substrates are disinfected in situ, prior to a crop production cycle, with a dilute aqueous solution containing hydrogen peroxide and at least one peracid having a
Inventors
- 👤 Andrew Alan Davidson
- 👤 Robert Aleksander Karasinski Szmidt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
A; A01; A01N; A01N37/00; A01N37/16; A01G; A01G31/00; A01N59/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
60 words
A method of hydroponic crop production wherein a hydroponic substrate and/or liquid-supply means of a hydroponic system which has been infected with a microbial population is treated after a crop-production cycle and prior to a subsequent crop production cycle with a dilute aqueous solution containing at least one peracid having a substantially to reduce but not eliminate the microbial population.
Claim 2
Independent Claim
60 words
A method of hydroponic crop production wherein a hydroponic substrate and/or liquid-supply means of a hydroponic system which has been infected with a microbial population is treated after a crop-production cycle and prior to a subsequent crop production cycle with a dilute aqueous solution containing at least one peracid having a substantially to reduce but not eliminate the microbial population.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein the dilute aqueous solution contains hydrogen peroxide and a percarboxylic acid.
Claim 4
Dependent Claim
14 words
A method according to claim 2, wherein the peracid is peracetic or perpropionic acid.
Claim 5
Independent Claim
29 words
A method according to any of claims 1 to3, wherein the hydroponic substrate contains less than 5% by volume of organic matter at the time of the said treatment.
Claim 6
Independent Claim
30 words
A method according to any of claims 1 to 4, wherein the hydroponic substrate contains less than 2% by volume of organic matter at the time of the said treatment.
Claim 7
Independent Claim
30 words
A method according to any of claims 1 to 5, wherein the hydroponic substrate contains less than 0.5% by volume of organic matter at the time of the said treatment.
Claim 8
Independent Claim
22 words
A method according to any of claims 1 to 6, wherein the treatment solution is free from significant quantities of dissolved salts.
Claim 9
Independent Claim
18 words
A method according to any of claims 1 to 7, wherein the treatment solution contains a wetting agent.
Claim 10
Dependent Claim
13 words
A method according to claim 8, wherein the wetting agent has bactericidal activity.
Claim 11
Dependent Claim
31 words
A method according to claim 8 or 9, wherein the wetting agent is an alkylaryl sulphonic acid having from 6 to 18 carbon atoms in the alkyl substituent of the molecule.
Claim 12
Independent Claim
19 words
A method according to any of claims 8 to 10, wherein the wetting agent is dodecyl benzene sulphonic acid.
Claim 13
Independent Claim
17 words
A method according to any preceding claim, wherein the treatment solution contains a stabilizer for percarboxylic acids.
Claim 14
Independent Claim
29 words
A method according to any preceding claim, wherein the peracid of the treatment solution is generated by the reaction of hydrogen peroxide with the corresponding acid or acid anhydride.
Claim 15
Independent Claim
23 words
A method according to any preceding claim, wherein the treatment solution is prepared by dilution of a more concentrated solution of the peracid.
Claim 16
Independent Claim
23 words
A method according to any preceding claim, wherein the concentration of peracid in the treatment solution is from 0.001 to 0.05 mol dm³.
Claim 17
Dependent Claim
22 words
A method according to claim 15, wherein the concentration of peracid in the treatment solution is from 0.0025 to 0.02 mol dm³.
Claim 18
Dependent Claim
22 words
A method according to claim 16, wherein the concentration of peracid in the treatment solution is from 0.005 to 0.01 mol dm³.
Claim 19
Independent Claim
28 words
A method according to any preceding claim, wherein the ratio of hydrogen peroxide to peracid in the treatment solution is in the range 2:1 to 10.1 by weight.
Claim 20
Dependent Claim
16 words
A method according to claim 18, wherein the ratio is in the range 4:1 to 7:1.
Claim 21
Independent Claim
36 words
A method according to any preceding claim, wherein the treatment solution is supplied to the substrate through the same irrigation system as is used for supply of liquid nutrients to the plants during the growing cycle.
Claim 22
Independent Claim
24 words
A method according to any preceding claim, wherein the application ratio of treatment solution to hydroponic substrate is from 0.1:1 to 5.0:1 by volume.
Claim 23
Dependent Claim
16 words
A method according to claim 19, wherein the application ratio is from 0.5:1 to 1.0:1 volume.
Claim 24
Dependent Claim
17 words
A method according to claim 20, wherein the application ratio is from 0.66:1 to 0.83:1 by volume.
Claim 25
Dependent Claim
12 words
A hydroponic substrate treated by a method according to any preceding claim.
Claim 26
Dependent Claim
19 words
A hydroponic system having a liquid-supply means treated by a method according to any of claims 1 to 23.
References Cited (Backward Citations)
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