Ever heard of stonemeal? It is pulverized stone, often produced as by-product in the mining industry. It has no large scale application and consequently stockpiled at mining sites. The rock fines, containing valuable crop nutrients like kalium, magnesium, calcium and a broad scale of micronutrients, can be used by farmers as additional fertilizer.
The documentary ‘Remineralization in Brazil’ shows how farmers managed to increase their yields and nutritional value of the crops with stonemeal. At same time farmers made less input costs increasing profitability of their farms.
Other benefits derived from some stonemeal mixtures are carbon sequestration (Olivine and serpentine) and water retention (vermiculite). The principles of carbon sequestration is documented in the video “Rock rust and Biochar as a strategy for carbon sequestration.’