OVERSEER models the flow of nutrients on a farm, and produces nutrient budgets and greenhouse gas footprint reports.

While a growing number of farmers are required to report on their nitrogen and phosphorus losses to Regional Councils, OVERSEER looks at all seven major farm nutrients – nitrogen (N), phosphorus (P), potassium (K), sulphur (S), calcium (Ca), magnesium (Mg) and sodium (Na) – as well as acidity for pastoral blocks - to provide a full picture of the farm’s nutrient health.

Nutrient cycling on farms and OVERSEER

A farm is a complex living system; made up of soil, plants, water and often animals – which all contain nutrients. The changing nature of a farm adds to the complexity of modelling nutrient flows, because different farming practices and preferences affect how nutrients cycle around the farm.

To create a nutrient budget, OVERSEER captures information about how a farm is run and models it through a series of complex sub-models that mimic the known bio-physical processes operating across a farm system.

There is a full technical description of how OVERSEER works in the OVERSEER Technical Description.