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No im not confused ..it was an articles words not mine It was addressing the generic term 'rock dust' as though all were the same.It was stating that it can vary in its constituents and choice will depend on these constituents and whether it is whats needed by a particular crop and particular soil..which sounds obvious to me.
KP have mined within an area where there is a lot of established crop growing so they state so im confused about your statement indicating that the soil wont be fit for years to come.You both cant be right.Anyway hoping for some clarification in the next 2 weeks maybe.
With reference to bopd situation
Will Any Rock Dust Do?
If soil hasn’t the right nutrient mix to match the crop, then using any old rock dust may not help, and could even prove toxic to some degree. Depending on the source, rock elements will vary as will the needs of different soils in different areas.growing different crops.
Boral suggests blending different types of rock dust, such as granites and river gravel, plus added minerals, to make up for any deficiency. While commercial enterprises do various rock dust mixes to broaden the spectrum of minerals, this still may not suit your soil’s individual requirements.
Altho i did find this which contradicts the June 2018 announcement
Harvest Minerals Limited / Index: LSE / Epic: HMI / Sector: Mining
27 September 2017
Harvest Minerals Limited
("Harvest" or the "Company")
Registration of KPfértil as a Remineraliser
Harvest Minerals Limited, the AIM listed fertiliser development company, is pleased to announce that it has submitted an application to register its product, KPfértil, as a remineraliser to the Brazilian Ministry of Agriculture, Livestock and Supply ('MAPA'). The application is expected to be approved by the end of the year.
I seems to remember a certain person cast doubt over whether rock crushing was actually being carried out .Now it seems not only does that person know its being carried out but also thinks other processes goin on.as well
So a remineralizer helps retain more expensive fertilizers which are leached away from the soil and also unlock nutrients .Often used in conjunction with fertilizers and means farmer will need to buy less of the expensive fertilizer which is the financial incentive
Just to clarify
The volcanic rocks often contain very good levels of essential macro and micro elements and micro-nutrients. Rock-dust on it's own is not a fertiliser, for it lacks the qualifying levels of nitrogen, potassium and phosphorus.
The benefit of the addition of a quality volcanic rock dust to the soil is in the remineralisation that takes place. This is the return of minerals to the soil which had been lost by erosion, leaching, and / or over-farming.
Volcanic Rock dust can be added to soil to improve fertility and has been tested since 1993 at the Sustainable Ecological Earth Regeneration Centre (SEER Centre) in Straloch, near Pitlochry, in Perth and Kinross, Scotland. Further testing has been undertaken by James Cook University, Townsville, Far North Queensland.
SEER’s research claims that the benefits of adding rock dust to soil include increased moisture holding properties in the soil, improved cation exchange capacity and better soil structure and drainage. Rock dust also provides calcium, iron, magnesium, silica, phosphorus and potassium, plus trace elements and micronutrients. By replacing these leached minerals it is claimed that soil health is increased and that this produces healthier plants.