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How are FDR Fertiliser numbers calculated?

Information on where each figure of the FDR Fertiliser section comes from

Written by Michaela Lowry

Every fertiliser application you’ve recorded in Trev during the season is split into nitrogen-bearing and non-nitrogen products. The structure mirrors how Fonterra organises this section on their portal.

The numbers come from:

  • Fertiliser application events drive every figure in this section - totals applied, application rates, monthly timing, and the “total amount purchased” number (Trev doesn’t track fertiliser purchases as separate events, so we derive the “purchased” total from your applications)

  • The Trev fertiliser product catalogue drives the product name, manufacturer, and nutrient composition (N, P, K, S, Mg, Ca percentages)

Trev only includes events in a Confirmed state. Draft or Deleted events are excluded.

Trev includes events recorded against your Dairy Farm Effective Area (DFEA) for both nitrogen and non-nitrogen applications - events with a Type of Pasture, Crop, or no Type set are all picked up. Events typed as Support Land aren’t included.

If a fertiliser figure looks off, fix it in the underlying application event by checking the Type is set correctly (Pasture or Crop, not Support Land), the rate and total are right, and the event is Confirmed.

Nitrogen fertiliser

Products with a nitrogen percentage greater than zero (e.g. urea, DAP, ammonium sulphate) are reported separately because Fonterra tracks nitrogen specifically for its compliance reporting.

  • Nitrogen activity (Yes / No). Marked Yes if there’s at least one nitrogen fertiliser application on the DFEA during the season.

For each nitrogen product, Trev shows:

  • Total amount purchased. Reported as the total tonnes applied during the season, since Trev tracks fertiliser as applications rather than separate purchase events.

  • Total amount applied to the DFEA, including crops. Tonnes of product applied across all DFEA-relevant events (Type = Pasture, Crop, or unset).

  • Highest rate applied to pasture on the DFEA, excluding crops. The single highest application rate (kg/ha) across Pasture or Type-unset events. Crop events are excluded.

  • Tick the months you applied this product to your DFEA. A month-by-month Yes/No grid showing which months had at least one application.

Non-nitrogen fertiliser

Products without nitrogen (e.g. superphosphate, potash, lime, magnesium, sulphur) have the general structure as Nitrogen, but without the month-by-month tick boxes (Fonterra doesn’t require monthly timing for non-nitrogen products).

  • Non-nitrogen activity (Yes / No). Marked Yes if there’s at least one non-nitrogen application on the DFEA during the season.

For each non-nitrogen product, Trev shows:

  • Total amount purchased. Reported as the total tonnes applied during the season, since Trev tracks fertiliser as applications rather than separate purchase events.

  • Total amount applied to the DFEA. Total tonnes of this product applied across all DFEA-relevant events (Type = Pasture, Crop, or unset).

  • Highest rate applied to pasture on the DFEA, excluding crops. Same calculation as for nitrogen products — single highest application rate on Pasture or Type-unset events, with crops excluded.

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