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2. Controlled-release fertiliser - Wikipedia

   en.wikipedia.org/wiki/Controlled-release_fertiliser

   Controlled-release fertilizer is also known as controlled-availability fertilizer, delayed-release fertilizer, metered-release fertilizer, or slow-acting fertilizer. Usually CRF refers to nitrogen-based fertilizers. Slow- and controlled-release involve only 0.15% (562,000 tons) of the fertilizer market (1995).

3. Feather meal - Wikipedia

   en.wikipedia.org/wiki/Feather_meal

   It is then dried, cooled and ground into a powder for use as a nitrogen source for animal feed (mostly ruminants) or as an organic soil amendment. Containing up to 12% nitrogen, it is a source of slow-release, organic, high-nitrogen fertilizer for organic gardens. It is not water-soluble and does not make a good liquid fertilizer. It can be ...

4. Coated urea - Wikipedia

   en.wikipedia.org/wiki/Coated_urea

   The particles of fertilizer may in turn be sealed with wax to slow release further still, making microbial degradation necessary to permit water penetration. The size of fertilizer particles may also be varied in order to vary the time at which nitrogen release occurs. Sulfur-coated products typically range from 32% to 41% elemental nitrogen by ...

5. Milorganite - Wikipedia

   en.wikipedia.org/wiki/Milorganite

   Heat-dried biosolids contain slow release organic nitrogen and largely water-insoluble phosphorus bound with iron and aluminum and high organic matter. [21]Milorganite can be used without restriction on gardens growing food crops intended for human consumption under United States Environmental Protection Agency (EPA) rules.

6. Fertilizer - Wikipedia

   en.wikipedia.org/wiki/Fertilizer

   Controlled-release fertilizer is also known as controlled-availability fertilizer, delayed-release fertilizer, metered-release fertilizer, or slow-acting fertilizer. Usually CRF refers to nitrogen-based fertilizers. Slow- and controlled-release involve only 0.15% (562,000 tons) of the fertilizer market (1995).

7. Bone meal - Wikipedia

   en.wikipedia.org/wiki/Bone_meal

   Bone meal provides phosphorus and calcium to plants, along with a largely inconsequential amount of nitrogen. [4] The N-P-K rating of bone meal is typically 3–15–0 [5] along with a calcium content of around 12% (18% CaO equiv.), [6] although it can vary quite a bit depending on the source from 1–13–0 to 3–22–0.