DDPhos (Fine Particle Granulated RPR)

Call 0800 43 42 54 for competitive pricing.
Hastings store – Product in stock.
All other stores – Currently shipping to order.



Product Description

12.7% P (Cit. Sol. ≥ 38%), 1% S, 32% Ca
Supplied ex Hastings Warehouse or through direct shipment to any NZ port
Supplied in bulk
Use in: Year round
Click here for freight rates to your farm


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

Why Use Fine Particle Granulated RPR:

Dickie Direct Fine Particle Granulated RPR is manufactured by finely grinding high grade Egyptian Rock Phosphate and granulating it into an easy to blend, handle and apply product. RPR has a number of pricing and agronomic advantages:

Key Benefits of RPR in general:

  • P is in a non-water soluble (slow release) form. For soils with low phosphate retention (Low Anion Storage capacity) this means less phosphate is leached through the soil profile resulting in a higher phosphate utilisation. Conversely in soils with a high Phosphate retention (High Anion Storage Capacity) less phosphate is bound up as Aluminum Phosphate compared to acidulated phosphate fertilisers as it is the acid that destabilises Aluminum causing it to bind up with Phosphate lowering phosphate utilisation. As a result less phosphate can be applied for a better response resulting in significant savings on Phosphate applications
  • Has a neutralising effect on PH. Has approximately 50% of the liming effect of standard Ag Lime. More importantly, it is not acidifying the soil like other forms of Phosphate. Save money on a reduced/no requirement for liming when using RPR.
  • Non-acidic so good for soil health and biology. Soil microbes which are a vital component of healthy soils are more active in basic soil conditions. Get your soils doing more of the work for you.

What makes Dickie Direct Fine Particle Granulated RPR the best RPR in the market?

  • Contains a high P content compared to alternative RPR’s resulting in lower freight and application costs.
  • Citric Solubility ranges from 37%-42% as a result of the product being ground to an average particle size of 74 Micron before the granulation process. As a result Phosphate is made available to the plant faster than standard RPR’s.
  • A faster release period of 2-3 years in typical conditions meaning a quicker/better return on your fertiliser investment.
  • In a granule form giving it very good blending and application characteristics.
  • Very low heavy metals with Cadmium testing at 1-2 PPM.
  • Blend easily and accurately with Elemental Sulphur 90S to cater for medium term Sulphur requirements.
  • Blend easily and accurately with DAP and/or TSP to achieve a balance between fast and slow release phosphate.

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.

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.

Additional Information

Nutrient Base

Nitrogen, Phosphate, Sulphur

Application Type


Seasonal Use

Autumn, Spring