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  • N:0
  • P:13%
  • K:0
  • S:0
  • Ca:35%
  • Mg:0
Hastings Store – Currently shipping to order.
All Other Stores – Currently shipping to order.


13% P (Cit. Sol. ≥ 32%), 35% Ca
Supplied ex Hastings Warehouse or through direct shipment to any NZ port
Supplied in bulk
Use in: Year round
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Products FAQs

Why Use RPR:

  • The slow release of phosphate in RPR makes it suitable for maintenance applications of phosphate.
  • RPR offers best responses in acidic soil conditions.
  • Unlike most other forms of phosphate RPR has a neutralising effect on PH.

Precautions when applying RPR:

  • RPR should be used in conjunction with Triple Super or DAP when a more immediate release of phosphate is also required.
  • When transitioning from more conventional phosphate forms RPR should be used in conjunction with Triple Super or DAP until sufficient phosphate has started to be released from the RPR, this can be 1-2 years depending on soil and climatic conditions.

Phosphate's role in crops and pastures:

Phosphorus is an essential compound of Adenosine Triphosphate (ADP), the energising component driving plant development. Phosphorus plays an important role in photosynthesis as it enables plants to store and metabolise sugars, (the energy created in photosynthesis).The physical attributes in plants that are aided by phosphorus are:

  • Larger root growth.
  • Earlier formation of plant shoots.
  • Improved stalk and stem strength in crops.
  • Improved fruit, vegetable and grain quality.
  • Promoted seed formation in crops.
  • Increased resistance to moisture and colder temperatures.

When to use

Summer, Autumn, Winter, Spring

Calcium's role in crops and pastures:

  • Participates in metabolic processes of other nutrients uptake.
  • Promotes proper plant cell elongation.
  • Strengthen cell wall structure – calcium is an essential part of plant cell wall. It forms calcium pectate compounds which give stability to cell walls and bind cells together.
  • Participates in enzymatic and hormonal processes.
  • Helps in protecting the plant against heat stress – calcium improves stomata function and participates in induction of heat shock proteins.
  • Helps in protecting the plant against diseases – numerous fungi and bacteria secret enzymes which impair plant cell wall. Stronger Cell walls, induced by calcium, can avoid the invasion.
  • Affects fruit quality.
  • Has a role in the regulation of the stomata.


RPR (Reactive Phosphate Rock) contains a slow release, soluble form of phosphate.

Product Downloads

Fine Particle Granulated RPR Flyer 2020