Mineral Fertiliser Parameters

Mineral fertiliser parameter files define how an applied amount of mineral nitrogen is distributed among carbamide-N, ammonium-N, and nitrate-N. Each JSON file represents one fertiliser parameter set and is located in the mineral-fertilisers/ directory of the monica-parameters repository. The total nitrogen application amount is not defined in these files. It is specified separately in the crop management configuration, normally in kg N.

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List of mineral fertiliser parameters

Parameter Name	Type	Unit	Description	Example
id	String		Identifier of the parameter set. It normally matches the JSON filename without its extension.	"id": "AN"
name	String		Full descriptive name of the fertiliser	"name": "Ammonium Nitrate"
Carbamid	Number	kg carbamide-N kg-1 total N	Fraction of the applied nitrogen added as carbamide-N (urea-N)	"Carbamid": 0
NH4	Number	kg NH4-N kg-1 total N	Fraction of the applied nitrogen added as ammonium-N	"NH4": 0.5
NO3	Number	kg NO3-N kg-1 total N	Fraction of the applied nitrogen added as nitrate-N	"NO3": 0.5
type	String		Declares that this JSON defines mineral fertiliser parameters	"type": "MineralFertiliserParameters"

Note

Carbamid, NH4, and NO3 describe the distribution of the applied nitrogen among the three nitrogen forms. They do not describe the nitrogen concentration of the fertiliser product.

Warning

The three fractions should normally sum to approximately 1.0. MONICA does not validate or normalize their sum when loading the parameter file.

Most supplied files sum to 1.0, apart from insignificant floating-point differences. However, the current ALZON values sum to approximately 0.99666, and the current NS values sum to approximately 1.03833.

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Available mineral fertilisers

The following table lists all available mineral fertilisers in MONICA with their IDs, full names, and nitrogen form breakdown.

ID	Full Name	Carbamid-N	NH4-N	NO3-N
AHLS	Ammoniumnitrat-Harnstoff-Lösung + Ammoniumthiosulfat, 27-3	0.48	0.30	0.22
ALZON	Alzon flüssig-S	0.46	0.33	0.21
AN	Ammonium Nitrate	0.00	0.50	0.50
AP	Ammonium Phosphate	0.00	1.00	0.00
AS	Ammonium Sulphate	0.00	1.00	0.00
ASH	Ammonsulfat-Harnstoff, 'Piamon'	0.77	0.23	0.00
CF4	Compound fertiliser (43% NO3, 57% NH4)	0.00	0.565	0.435
CP1	Compound fertiliser (0% NO3, 100% NH4)	0.00	1.00	0.00
CP2	Compound fertiliser (35% NO3, 65% NH4)	0.00	0.65	0.35
CP3	Compound fertiliser (50% NO3, 50% NH4)	0.00	0.50	0.50
NPK	NPK-Dünger	0.00	0.66	0.34
NS	Stickstoffdüngerlösung mit Schwefel, Piasan 24 S	0.50	0.33	0.21
PN	Potassium Nitrate	0.00	0.00	1.00
U	Urea	1.00	0.00	0.00
UAN	Urea Ammonium Nitrate	0.50	0.25	0.25
UAS	Urea Ammonium Sulphate	0.82	0.18	0.00
UNI	Urea (nitrification inhibitor)	1.00	0.00	0.00

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Example: AN.json

{
    "Carbamid": 0,
    "NH4": 0.5,
    "NO3": 0.5,
    "id": "AN",
    "name": "Ammonium Nitrate",
    "type": "MineralFertiliserParameters"
}