10. The potential of RPR I have been involved with RPR research and promotion in New Zealand for 40 years. I spent 17 years as a soil fertility research scientist with the Agricultural Research Division of the Ministry of Agriculture – what became AgResearch – including 3 years as Chief Scientist (Soil Fertility) at … Read more
9. Quin Environmentals Provides Two Quinfert RPR Grades (V1 and V2) Solely due to games being played by the industry, Quin Environmentals (NZ) Ltd has decided to make 2 very slightly different grades available to farmers. V1 or ‘HRPR’ was field-tested by the IFDC, and rated by them as a Highly Reactive Phosphate … Read more
6. Important facts about superphosphate and RPR Superphosphate is advertised as having 9.0% P. But how much of this 9% is actually plant available? An indication of this is how much of the total P is citric soluble. Currently, it is about 8% P. The difference is largely unreacted phosphate rock that did … Read more
1. Economic and environmental benefits of reactive phosphate rock (RPR) Background Both the economic and environmental benefits of using RPR as the source of phosphate on New Zealand’s soils have been deliberately understated by the fertiliser manufacturing industry in the past decade. With no significant independent importation and scientific promotion of RPR, … Read more