Superphosphate is a manufactured fertiliser, containing plant-available phosphorus and sulphur for optimum pasture growth. It varies in colour from brown to dark grey.
Superphosphate contains phosphorus and sulphur in a ratio of 1 to 1.22.
Superphosphate generally mixes well with other products, but is not compatible with: Potassium Nitrate, Ammonium Nitrate, Mono Ammonium Phosphate (MAP), Cropmaster DAP, Calcium Ammonium Nitrate (CAN) or Urea.
Superphosphate can be compatible with Flexi-N (magnesium coated Urea) and Ammonium Sulphate Granular under certain circumstances.
Segregation may occur when mixed with product with differences of particle size, please refer to our compatibility chart below.
Superphosphate is made by reacting finely ground phosphate rock with sulphuric acid to convert the insoluble mineral to a plant available form. The colour varies from brown to dark grey depending on rock type used in manufacture.
Superphosphate is ideal for both capital and maintenance applications, however, it is primarily used as a maintenance fertiliser, providing a pool of soil solution P for pasture.
It is also ideal for pastoral development and arable/horticultural situations where immediate responses are required.
The calcium in Superphosphate can be important in some horticultural and hill country situations where it is uneconomic to use lime.
Do not spread at rates over 1 tonne/ha. When applied at a rate to meet P requirements, sulphur requirements will also be met in the majority of situations.
Spreading rates will vary according to farm type, climate, productivity and soil type.
Soil testing and fertiliser plans are available to ensure you use the right product at the correct rate.
Superphosphate can be stored over a season as long as it is kept in a cool, dry, well ventilated area.