Controlled Release Fertilizer控释肥料

Key points

• Slow release and controlled release are not synonyms: slow release only requires a release rate below that of conventional fertilizer, whereas controlled release additionally requires the process to be controllable and predictable.
• Assessment still rests on the release characteristics: GB/T 23348-2009 specifies an initial release of no more than 15% at 24 hours, no more than 80% cumulative at 28 days, and at least 80% by the declared release period.
• The release period is declared as a single value with a tolerance of 25% — for example, a declared six months allows the 80% cumulative release point to fall at six months plus 45 days.
• It suits single-application and mechanised systems, reducing the number of topdressings and the labour required — a central selling point as labour costs rise.

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