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DSSAT-Pythia Installation Guide

Software Requirements

To install and run DSSAT-Pythia on your PC, you will need the following software:

  1. DSSAT:
    Download and install DSSAT from DSSAT website.

  2. Python 3.8:
    Download the Python 3.8 installer for Windows or macOS from Python 3.8 release page.

    • During installation, select “Customize installation.”
    • Select all options under “Optional Features” and “Advanced Options.”
    • Note: DSSAT-Pythia only works with Python 3.8. If you have another version, uninstall it and download Python 3.8 from the above link.

  3. Git:
    Download and install Git from Git download page.

  4. Community Version of Visual Studio:
    Download and install Visual Studio from Visual Studio website.
    Select the Desktop development with C++ workload during installation.

  5. RStudio:
    To use RStudio on your PC, install both R and RStudio:

Steps to Install DSSAT-Pythia on PC

  1. Enable Developer Mode:

    • Open Windows Settings > Update & Security > For Developers.
    • Switch on Developer Mode and restart the computer.

  2. Open the Command Prompt in the C Drive:

    • Open the C drive and type cmd in the address bar and press Enter.

  3. Clone the DSSAT-Pythia repository:

    git clone https://github.com/dssat/pythia.git pythia

  4. Navigate to the cloned directory:

    cd pythia

  5. Delete the poetry.lock file:

    del poetry.lock

  6. Install Poetry:

    pip install poetry

  7. Install DSSAT-Pythia:

    <full path to poetry>\poetry install
<full path to poetry>\poetry build

  8. Install the Pythia wheel file:

    • Navigate to the dist folder and install the .whl file: 
      cd dist
pip install pythia-2.2.1-py3-none-any.whl
    • Note: Check the version in the dist folder and adjust the command if necessary.

  9. Add the path to pythia.exe to your environment variables.

  10. Close the command prompt.

Troubleshooting

  • If you encounter any issues during installation, delete the folder C:\pythia and repeat the installation steps.

Input Files Setup

  1. Download the InputFiles.zip folder from Google Drive link, unzip it, and save the Simulation_Data folder in C:\pythia\.

  2. Open the folder C:\pythia\Simulation_Data\OUTPUT\Sri_Lanka and remove all folders (if any).

    Note: Remove the contents from the OUTPUT folder every time you run the model.

Running the Model

  1. Open the command prompt at C:\pythia\Simulation_Data\Sri_Lanka by typing cmd in the folder address bar.

  2. Run the following commands to simulate maize and rice:

    pythia --all C:/pythia/Simulation_Data/Sri_Lanka/SL_Maize.json
pythia --all C:/pythia/Simulation_Data/Sri_Lanka/SL_Rice.json

  3. To view the output:

    • Open the .json file in C:\pythia\Simulation_Data\Sri_Lanka\.
    • Find the working directory in "workDir": "C:/pythia/Simulation_Data/OUTPUT/Sri_Lanka/…" and navigate to that folder.
    • The output will be available in .csv format.

Plotting Output in RStudio

  1. Open the R code file: C:\pythia\Simulation_Data\OUTPUT\ACASA_Sri_Lanka_maize.R.

  2. Install all required packages and modify the file location on line 22 to match the output .csv file.

  3. Run the R script to generate the yield plot.

  4. The plot will be saved at the location specified in line 62.

    Note: If you encounter errors reading the .csv file, open the file and delete all columns except LATITUDE, LONGITUDE, and HWAH.