Nitrogen footprint of protein-free products

• Nitrogen (N) footprint: A useful
  indicator of potential N pollution.

•  N-calculator method: A bottom-up
  approach to obtain N footprint.

• Expansion needed: Enable to calculate N footprint of protein-free (no Ncontaining) products.

• Example: Oil palm and its products,
  palm oil (PO) and palm kernel oil (PKO).