| 摘要 |
Described is a controlled release fertiliser composition comprising, a granular nutrient core material comprising at least one water-soluble fertiliser compound, and a water-insoluble coating consisting of a single layer of a uniform continuous polymer film, applied on the core material. The fertiliser composition provides a Gaussian nutrient release rate curve over time, with the maximum of the Gaussian nutrient release rate curve occurring between 1 and 18 months after exposure of the fertiliser composition to moisture. Also described is a method for providing a fertiliser composition exhibiting a nutrient release rate pattern matching the growth rate pattern of a plant species treated with the fertiliser composition, the method comprising: (i) determining the growth rate pattern of the plant species by plotting the growth rate, expressed in percent per day as a function of the growth season, (ii) determining the maximum in the growth rate pattern, and (iii) selecting a Gaussian nutrient release fertiliser composition with a nutrient release rate curve matching the growth rate pattern. The fertiliser composition comprising a granular nutrient core material comprising at least one water soluble fertiliser compound and a water-insoluble coating composition providing a Gaussian nutrient release curve over time. The coating consists of a single layer of a uniform continuous polymer film.
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