Growth substrates, their production and their use
The invention provides a method of growing plants in a mineral wool growth substrate, the method comprises providing at least one mineral wool growth substrate comprising binder and wetting agent, positioning one or more plants for growth in the growth substrate, characterized in that the height of the mineral wool growth substrate is at least 53 mm and the wetting agent comprises ionic surfactant.
1. A method of growing plants in a mineral wool growth substrate, the method comprising:
providing at least one mineral wool growth substrate having a height of at least 75 mm and comprising binder and wetting agent, in which the wetting agent comprises ionic surfactant, and
positioning one or more plants for growth in the growth substrate.
2. A method according to claim 1 in which the wetting agent comprises anionic surfactant.
3. A method according to claim 2 in which the wetting agent comprises linear alkyl benzene sulfonate anionic surfactant.
4. A method according to claim 1 in which the mineral wool growth substrate comprises no wetting agent other than the ionic surfactant.
5. A method according to claim 1 in which the amount of ionic surfactant is 0.01 to 3% by weight based on weight of the mineral wool growth substrate.
6. A method according to claim 1 in which the height of the mineral wool growth substrate is at least 85 mm.
7. A method according to claim 1 in which the height of the mineral wool growth substrate is at least 100 mm.
8. A method according to claim 1 in which the binder is a hydrophobic organic binder.
9. A method according to claim 1 in which the plants are irrigated with irrigation water and the irrigation water contains no anti foam material.
10. A method according to claim 1 in which the method is a propagation method.
11. A method according to claim 1 in which the plants are positioned in the mineral wool growth substrate after transplantation from another mineral wool growth substrate.
12. A method according to claim 1 in which the binder is hydrophobic and the ionic surfactant is present in an amount effective to improve the water distribution characteristics of the mineral wool growth substrate containing the hydrophobic binder.
13. The method according to claim 12 in which the ionic surfactant is an anionic surfactant.
14. A method according to claim 1 in which the amount of ionic surfactant is 0.05 to 0.5% by weight based on weight of the mineral wool growth substrate.
15. A method according to claim 1 in which the height of the mineral wool growth substrate is at least 85 mm.
16. A method according to claim 1 in which the height of the mineral wool growth substrate is at least 100 mm.
17. A method according to claim 1 in which the height of the mineral wool growth substrate is 100 to 150 mm.
18. A process of producing a mineral wool growth substrate comprising: providing solid mineral raw materials, melting the raw materials to form a melt, forming the melt into fibers, collecting the fibers as a primary web, consolidating the primary web, applying binder to the fibers after formation and before consolidation, subjecting the primary web to elevated temperature in order to cure the binder, and forming a growth substrate having height at least 75 mm, wherein the process comprises applying ionic surfactant to the fibers after formation.
19. A method of growing plants in a mineral wool growth substrate, the method comprising:
providing at least one mineral wool growth substrate having a height of at least 75 mm comprising binder and wetting agent, the wetting agent comprising ionic surfactant,
positioning one or more plants for growth in the growth substrate, and
irrigating the growth substrate from its base.
20. A growth substrate comprising mineral wool, hydrophobic binder and wetting agent comprising ionic surfactant, the growth substrate having a height of at least 100 mm.