| 摘要 |
<p>Cover disc for promoting plant growth and inhibiting weed growth, comprising a centric, through-going hole (2) and a through-going slot (3) extending from the hole to the circumference of the disc, comprising and being produced by pressing substantially growth promoting substances and possibly binding agents and specific additional materials which all are dissolved after a desired period of time by corresponding choice of the disc thickness in relation to the expected rain fall in the selected location.</p> |
