IMPORTANT NOTE: It is highly recommended that you upgrade your APSIM Next Gen version to at least version 2023.2.7164.0 or later.
In this exercise you will observe the cycle of fertiliser nitrogen in a fallow situation; urea to ammonium, ammonium to nitrate and the loss of soil nitrate via denitrification. This simulation will introduce editing a simple Manager rule and to more advanced features of graphing simulation results.
Dalby (C:\Program Files\APSIM[Version]\Examples\WeatherFiles)
Clock node, change the starting date to
1/1/1989 and the end date to
Heavy Clay soil from the
Percent full to 50 in the
Make the depth equal to the entire soil profile (check Water node for the profile depth).
Fertilise on fixed dates management node to the field node. You can locate this by going to:
Field node or copy and paste it to the
Type of fertiliser to apply? to
Amount of fertiliser to be applied (kg/ha) to
Report node let set up the output variables:
sum([Soil].NO3.kgha) as NO3Total
sum([Soil].NH4.kgha) as NH4Total
sum([Soil].Nutrient.DenitrifiedN) as Denitrification
Run the simulation
Delete the current graph named
Wheat Yield Time Series
Graph node to the
Nitrogen Cycle simulation node
Series node to
Create a new graph with a series each for
[Clock].Today as the
X axis variable.
From this chart you can see that significant nitrogen is lost via denitrification when large amounts of nitrate are available in saturated soil conditions.
Congratulations on finishing the 3rd module!