| 摘要 |
A plant growth support medium comprises a matrix of porous granular material at least some of the granules of which have plant nutrients adsorbed to their surfaces in a substantially dry state. The granular material is preferably a mineral material such as perlite and vermiculite and the nutrient-enrichment step may be performed by spraying a concentrated aqueous solution of the plant nutrients directly on to hot granules of the material substantially immediately after a heat treatment process which creates a humidity vacancy such that the nutrients are adsorbed to the surface of the granules in a substantially dry state. |
