Common sense tells us that if we use manufactured mineral fertilisers to produce food, eventually, the soil store of trace elements will decline, followed by a decline in the harvested crop, followed by a decline in the health of th4e crop, followed by a decline in the intake of trace elements by humans, followed by a decline in the health of humans.
This common sense understanding of the loss of micro-nutrients in human diets has been shown many times and, again, recently by a paper on soil Selenium decline by Steve McGrath et al and reported in the current edition of The Auger, journal of the British Society of Soil Science.
What do we do about it? See https://www.amazon.co.uk/Survival-Sustainable-Energy-Wastes-Shale/dp/1523264217 with government employing the BSSS nationally to monitor and guide on not too much and not too little.
Bill Butterworth, Land Research Ltd