Nitrogen Surplus is the balance between Nitrogen brought into the farm as fertiliser and supplements (inputs) and Nitrogen removed as products (outputs). N Surplus is presented as kg/ha/yr. The smaller the number the better. OverseerFM provides an estimate of N Surplus on the Farm Details report.

**N Surplus = N inputs – N outputs**

Nitrogen conversion efficiency (NCE) describes the proportion of the N brought into the farm that is converted into product. It is calculated as the sum of products divided by the sum of inputs. NCE is presented as a %. The larger the number the better. OverseerFM provides an estimate of NCE on the farm details report.

**Nitrogen conversion efficiency (NCE)** = **N in product/ N in inputs **