What is NPP?

The rate at which plants store carbon and is an indicator of farm production.

What is the unit of measure?

kgC ha d-1 refers to the amount of kilograms of carbon per hectare per day.

Why use the long-term mean?

Using data across more than 22 years helps to reduce the effect of seasonal variability.

The metric can be used to quantitatively compare farms even if they are in different regions or States.