Dear melo.  Thanks for your appreciation of my work on the soil conditioner TerraCottem, which is a compound of more than twenty different substances, working in synergy to produce more biomass with less water and less fertiliser.  In this it differs from most of the available soil conditioners, which are mostly single products, consisting of one or two chemical substances.  TerraCottem's most important objective, apart from other application possibilities, is to help poor rural and urban people to more fresh food with a minimum of water and fertiliser.  Small kitchen gardens can be made in almost every free space, even on roofs.  One can also switch to container gardening in almost every kind of container (flower pots, bottles, barrels, old wheelbarrows, yoghurt pots, etc.).  One can find a lot of applications of container gardening on my blog containergardening.wordpress.com.  You are right in saying that rock dust can be used as a good fertiliser for poor soils.  Indeed, rocks contain a number of fertilising mineral elements and rock dust, mixed with a poor soil (e.g. sand) will certainly contribute to the enhancement in dosage of certain, but not all mineral elements.

Prof. Dr. Willem Van Cotthem Beeweg 36 - B 9080 Zaffelare (Belgium)