| Name | Description | Solute1Name | Solute1Fraction | Release |
|---|---|---|---|---|
| CalciteCA | Ca as finely ground Agricultural Lime | Ca | 1.00 | 1 |
| CalciteFine | finely ground Agricultural Lime | Ca | 0.40 | 1 |
| Dolomite | finely ground dolomite | Ca | 0.22 | 1 |
| NO3N | N as nitrate | NO3 | 1.00 | 1 |
| NH4N | N as ammonium | NH4 | 1.00 | 1 |
| NH4NO3N | ammonium nitrate | NO3 | 0.50 | 1 |
| DAP | di-ammonium phosphate | NH4 | 0.18 | 1 |
| MAP | mono-ammonium phosphate | NH4 | 0.11 | 1 |
| UAN_N | N as Urea-AmmoniumNitrate | NO3 | 0.25 | 1 |
| UreaN | N as urea | Urea | 1.00 | 1 |
| UreaNO3 | N as urea | NO3 | 0.50 | 1 |
| UreaGranular | Urea fertiliser | Urea | 0.46 | 1 |
| NH4SO4N | ammonium sulphate | NH4 | 1.00 | 1 |
| RockP | Rock phosphorus | RockP | 0.80 | 1 |
| BandedP | Banded phosphorus | BandedP | 1.00 | 1 |
| BroadcastP | Broadcast phosphorus | LabileP | 1.00 | 1 |
Fertiliser Types
Introduction
The fertiliser module defines the characteristics of different fertiliser types, such as their chemical composition and release behaviour. These definitions are stored in a resource file named Fertiliser.json.
Understanding the composition and behaviour of different fertilisers allows users to select the most appropriate input for specific scenarios, such as rapid nitrogen availability, slow-release fertilisers, or dual-nutrient blends.
Structure of Fertiliser Definitions
Each fertiliser type in APSIM has the following attributes:
- Name: Identifier used within the simulation to refer to this fertiliser.
- Description: A human-readable explanation of the fertiliser’s nature or composition.
- Solute: The main chemical form of the nutrient (e.g., nitrate, ammonium) that the fertiliser releases into the soil.
- Fraction: The proportion (from 0 to 1) of the nutrient solute in the fertiliser product.
- Release Rate: The fixed amount or rate at which the nutrient becomes available in the soil after application. In most cases, this represents instantaneous release, but could be extended for controlled-release products.
Example Fertiliser Types in APSIM
Below is a simplified summary of several fertiliser types defined in APSIM NG: