DAISY Rewrite Status, April 1998

This document describes the current status for the DAISY simulation model. At a certain level of abstraction, the DAISY can be seen as consisting of the following components.

• A mathematical model of a crop/soil system.
• A set of software components written in C++ implementing the DAISY crop/soil model. Each software component implements a specific process in the mathematical model, such as nitrification or a crop. There can be several implementations of the same process, allowing the user to choose the one most suitable for the simulation.
• A C++ API for adding new software components to the DAISY system.
• A C API which allows the DAISY system as a whole to be used as a single component in another application.
• A library text files parameterizing the models. For example, we have a generic crop model with text files parameterizing it for crops as diverse as grass and potatoes. item Finally, the simulation file which selects among the components, determine their initial state, and perhaps further parameterizes them.