> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/databases/fertilizer.frt.md).

# fertilizer.frt

The fertilizer database summarizes parameters used by the model to simulate different types of fertilizer and manure.

| Field                                                                   | Description                                             |  Type  |   Unit   | Default |  Range  |
| ----------------------------------------------------------------------- | ------------------------------------------------------- | :----: | :------: | :-----: | :-----: |
| [name](/io-docs/introduction-1/databases/fertilizer.frt/name_fertdb.md) | Name of the fertilizer record                           | string |    n/a   |   n/a   |   n/a   |
| [min\_n](/io-docs/introduction-1/databases/fertilizer.frt/min_n.md)     | Fraction of fertilizer that is mineral N (NO3+NH3)      |  real  | fraction |   1.0   | 0.0-1.0 |
| [min\_p](/io-docs/introduction-1/databases/fertilizer.frt/min_p.md)     | Fraction of fertilizer that is mineral P                |  real  | fraction |   0.0   | 0.0-1.0 |
| [org\_n](/io-docs/introduction-1/databases/fertilizer.frt/org_n.md)     | Fraction of fertilizer that is organic N                |  real  | fraction |   0.0   | 0.0-1.0 |
| [org\_p](/io-docs/introduction-1/databases/fertilizer.frt/org_p.md)     | Fraction of fertilizer that is organic P                |  real  | fraction |   0.0   | 0.0-1.0 |
| [nh3\_n](/io-docs/introduction-1/databases/fertilizer.frt/nh3_n.md)     | Fraction of mineral N content of fertilizer that is NH3 |  real  | fraction |   0.0   | 0.0-1.0 |