The use of reactive phosphate rock (RPR) as a base for phosphate based fertilisers is well founded in Australia and overseas through numerous independent and replicated trials and studies.
When developing the BioAg range of fertilisers, we evaluated the benefits and negatives associated with all sources of phosphate and found that using a highly reactive, high grade reactive phosphate rock as the base for our fertiliser range provided the greatest benefit to the farmer and delivered the outcomes we wanted to achieve.
The result is the BioAg range of natural fertilisers that incorporate high grade raw materials with low levels of contaminants, and deliver sustainable and long term sources of nutrient in an efficient manner.
The BioAg range of fertilisers
View our range of natural fertilisers or continue below for more information on the use of phosphate fertilisers in Australian farming and agricultural production.
Why reactive phosphate rock?
There is a big difference between "straight" phosphate rock, and reactive phosphate rock.
Essentially "straight" phosphate rock has a low natural solubility and is unsuitable for direct application as a fertiliser without further processing. BioAg do not use "straight" phosphate rock in its fertilisers.
Reactive phosphate rock is a phosphate rock that meets or exceeds the minimum set standards for solubility, as measured by citric and formic solubility tests.
It is these "reactive" phosphate rock types that have been trialled as direct application fertilisers to great effect, and it is these types of rock that BioAg choose as the base for their natural fertiliser range.
Some sources of reactive phosphate rock do not meet other standards, such as maximum allowable levels of heavy metal contaminants. This is another consideration BioAg takes into account when choosing a source of reactive phosphate rock. The rock we use is not only a highly soluble variety, but also contains well below the maximum allowable limits for contaminants.
Trial: Reactive Phosphate Rock
Rock Phosphate and superphosphate as sources of phosphorus for subterranean clover on an acid sandy soil
Reactive Phosphate Rock Evaluation – Agronomy Field Trials
The role of reactive rock phosphate fertilisers in Australia
When is the best time to buy phosphate fertilisers?