In which xml we can add organic amendment?

[eelsaf]

I am simulating scenarios in APSIM classic for oil palm. I wonder which xml file contains the script for adding organic amendment or reducing surface residue from frond removal and litter.
I have explored some XML files, such as SOM, SoilN, PalmManagement, Management, and OilPalm, but I could not find them.
Please advice.

Thank you

[peter-devoil]

You can add material to the SOM pools with some manager code , and similarly, a tillage event will incorporate it. A tillage with depth=0 indicates to burn the material

[eelsaf]

Thank you peter-devoil for the guide.
I tried to modify as follow :

library(apsimr)

Define the APSIM file and working directory

apsimFile <- "Sim_mmda_ssp585_uksem1.apsim" # Replace with the actual path
apsimWd <- getwd() # Use the current working directory

Define the EFB application script

efb_script <- "
if year >= 5 and today = date('01-may') then
surfaceom add_surfaceom name=EFB, type=labile, mass=30000, cnr=30, cpr=80, standing_fraction=0.
endif
"

Add the EFB script under the 'Palm Management' manager's 'start_of_day' event

newFile <- edit_apsim(
file = apsimFile,
wd = apsimWd,
var = "manager[@name='Palm Management']/script[event='start_of_day']", # Corrected XPath
value = list(efb_script),
overwrite = FALSE # Save to a new file
)

Rename and save the modified file

Define the new file name (appending "_modif_EFB" to the original file name)

newApsimFile <- gsub(".apsim", "_modif_EFB.apsim", apsimFile)

Rename the modified APSIM file

Make sure the path to newFile is absolute or relative correctly to avoid errors

file.rename(newFile, newApsimFile)

Run the simulation with the modified file

apsimExe <- "C:/Program Files (x86)/APSIM710-r4221/Model/Apsim.exe" # Replace with the actual path to APSIM.exe
results <- apsim(
exe = apsimExe,
wd = apsimWd,
files = newApsimFile
)

Save results to a CSV file

resultsFile <- gsub(".apsim", "_results.csv", newApsimFile)
write.csv(results, resultsFile, row.names = FALSE)

Print the results to verify

print(results)
But seems, not working because I cannot find the exact "var" for manager code.

[peter-devoil]

Replacing the entire management text may be a bit heavy handed - perhaps there's a way to put some parameters on the script (eg dd-mmm for operation) and manipulate just those parameters?

[eelsaf]

Replacing the entire management text may be a bit heavy handed - perhaps there's a way to put some parameters on the script (eg dd-mmm for operation) and manipulate just those parameters?

Dear Peter-devoil, can you give some example, technically how can we do that using either edit the xml on inifile on APSIM classic or edit through apsimr in R. Thanks