regyp_map_iconPHOSPHATE ROCK

PHOSPHATE ROCK products are an excellent natural source of phosphorus, calcium and many essential trace elements. Phosphate rock has up to one fifth the neutralising power of lime. Soft Rock Phosphate can provide exceptional results and make P readily available for plants, especially if the soil is Acidic (pH 5 to 6) and low in calcium (Ca) and the soil has low levels of available P.

Phosphate Rock is a slow release organic fertiliser and continuously adds P to the soil over a longer period of time. The benefits to farmers are lower costs and lower labour requirements because Phosphate Rock does not have to be applied every year.

Rock phosphate, can mineralise the soil and improve the quality of crops and soil structure. However, its principal uses are to build phosphate fertility where levels are low and/or to increase rooting activity in transplants and sprouting seeds.

Gypsum 90%
Calcium 23%
Sulphur 17%
Organics (paper) 2%


      • Unlike acidulated phosphates, such as triple super phosphate, Phosphate Rock offers a small per cent age of its total phosphate content as immediately available. Large quantities of available phosphate from acidulated phosphates tend to fix or bond to cation (positively charged ion) nutrients in the soil, rendering the phosphate itself unusable, and also locking up the cations.
      • All this occurs before plants have a chance to use much of this very important phosphate. The slow release nature of Phosphate Rock allows plants good opportunity for access before fixation can occur. Additionally, fewer cation nutrients (such as calcium, magnesium, and potassium) can be bound up by free phosphate ions. Applications of Phosphate Rock can last 5 years or longer, depending on soil conditions.
      • Pacific Fertiliser also provides a Reactive Phosphate Rock (RPR) products which consist of fine ground phosphate rock and sulphur. Elemental Sulphur is blended at various ratios (RPR:S), depending on soil pH, to make effective use of the RPR even in strongly acidic soils. The Sulphur helps to overcome the constraint on the dissolution of RPR resulting from frequent periods of low soil moisture.