Geisseler Lab

Nutrient Management


Scientific article this tool is based on

Research Summary

Nitrogen Mineralization from Organic Amendments

The calculations in this tool are based on an analysis of 113 datasets from the scientific literature. Nitrogen mineralization rates are adjusted based on soil temperature data from local CIMIS weather stations. Soil moisture is assumed to be optimal near field capacity. When amendments are incorporated into dry soil, N mineralization would be slower than calculated. The tool should not be used when amendments are left on the soil surface.
Information on lines marked with an * needs to be provided. If no information on amendment and soil properties are entered, the tool will use average values. In this case, however, the calculations will be less accurate for a specific situation.

Amendment Application


Type of amendment*:

Application rate*: tons/ac

Application date:

Period of interest:

Depth of incorporation*:

* Required input.

Amendment Properties

Amendment dry matter: %

Total nitrogen:

Carbon to nitrogen ratio:

Mineral nitrogen:
(ammonium and nitrate)

Soil Properties

Soil organic matter: %

Residual soil nitrate:

Nitrogen Mineralization

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The graph and the calculations are based on average values from scientific studies. Weather conditions, soil properties, amendment characteristics and management all can affect N mineralization rates. It is therefore important to monitor N availability of the field with soil or leaf analyses. More information about soil and leaf sampling can be found here.

Total N applied:

Total mineral N applied:

Estimated available N:

Percent available: