Cloverking is a maintenance fertiliser that is based on high-quality RPR. Cloverking can also be blended with elemental sulphur, where needed, to provide a broader spectrum of nutrients. The amount of elemental sulphur in Cloverking can be adjusted to meet the individual requirements of your farm.
Cloverking can be used in many farming situations. It is particularly suited to well-developed farms, but should not be used where a rapid, short-term increase in phosphate availability is required. It is ideal for use in situations where phosphate loss needs to be minimised.
As Cloverking is based on RPR, it is best applied on soils with a pH of less than 6.0, and where rainfall exceeds 800 mm per annum. If soil pH is higher than 6.0 (but still less than 6.3) Cloverking can still be used as long as there is sufficient annual rainfall.
Cloverking is suitable for use on BioGro-certified farms.
RPR (reactive phosphate rock) is a natural source of phosphate and, importantly, they can be used as a fertiliser without any chemical modification. The reason for this is the carbonate content of the rock. This carbonate weakens the rock and allows it to be more easily broken down by organic acids in the soil, thereby releasing the phosphate held in the rock.
The carbonate in RPR also contributes a liming value to the product. As the phosphate is released the carbonate consumes soil acid, helping to neutralise soil acidity. One tonne of RPR has the equivalent liming value of half a tonne of lime. When used as part of an ongoing nutrient programme, RPR can extend the interval between lime applications on most properties.
As the phosphate in RPR is released relatively slowly (compared to the release from superphosphates) there is less risk of this phosphate being lost through run-off. As a result, RPR can be applied closer to waterways without the risk of polluting surface water.