Plant nutrients – notably nitrogen, phosphorus, potassium and sulphur – are constantly being exported from farms in the form of plant and animal products. To sustain productivity, these nutrients must be replaced by fertilisers.
What is a wetting agent?
A wetting agent is a chemical compound commonly known as a surfactant. It lowers the surface tension between:
(a) two liquids,
(b) between a liquid and a solid, allowing easier spreading and penetration of a liquid into a solid.
A soil wetting agent is particularly useful on soils and potting media that have become hydrophobic (water-repellent) such as:
- soils that have formed a crust due to lack of cultivation
- sandy loams
- soils with a high organic content where the surface may have become 'waxy'
- soils and potting mixes that have been allowed to become extremely dry
- Wetting agents may be liquid concentrate (ready to be diluted with water and applied) or solid (granular).
Some of the leading brands we carry are: