| 摘要 |
A material containing an agro-chemical agent consists of porous pellets or particles or sintered fly ash that have been emersed in a hot aqueous solution of an agro-chemical agent such as a fertilizer, pesticide and/or fungicide. The pellets are dried and when subsequently incorporated in a compost or applied to a field gradually release the agro-chemical agent over a period of time. The pellets or particles may be coated with a coating to delay the release of the agro-chemical agent such as a semi-permeable coating, or a coating of low water permeability, or a coating of a biodegradable material. |
