Note: This page is no longer being maintained and is kept for archival purposes only.
For current information see our main page.
Garden with Insight Kurtz-Fernhout Software
Developers of custom software and educational simulations.
Home ... News ... Products ... Download ... Order ... Support ... Consulting ... Company
Garden with Insight
Product area
Help System
Quick start

Garden with Insight v1.0 Help: Soil patch next day functions: calculate equilibrium flow between active and stable N in organic matter

The ratio of active to stable organic N is an important determinant of how quickly nutrients become available to plants, because mineralization (conversion to nitrate) only takes place in the active organic N. Flow from active to stable organic N (or back) attempts to keep the active:stable ratio at a constant for each soil layer, constrained by a constant maximum rate of flow.

The equilibrium ratio of active:stable organic N is calculated by a function based on the number of years the soil had been cultivated before the simulation starts (a parameter). Generally the longer a soil area has been cultivated, the lower the ratio of active to stable organic N (because what remains is held the most tightly). Layers below the plow depth (0.2 meters) have a ratio of 40% that of the top layers.

EPIC Mineralization (includes active-stable organic N flow)
Model contents

Home ... News ... Products ... Download ... Order ... Support ... Consulting ... Company
Updated: March 10, 1999. Questions/comments on site to
Copyright © 1998, 1999 Paul D. Fernhout & Cynthia F. Kurtz.