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A topic that crops p) up at the field. It seems a few follow some ejit on a gardening blog. They either try out this ridiculous no dig growing scheme or buy in bags of cheap compost with the chemicals added to low quality soil.2 things do make a big difference: variety of crop, and fertilizer.
Heritage varieties typically are much more nutritious than modern varieties, because modern varieties have been selected to suit the growers and shippers and retailers, leading to stuff that can be picked by machine, washed by machine, stored for months and months, packed by machine, and delivered to the supermarket as (ha ha) 'ripen at home' fruit that never actually ripens, but instead rots at room temperature (and tastes sweet if it tastes of anything) - and then the consumer gets the blame for large food waste rates...
And if you fertilize a field year after year with only NPK, what you grow in it will have lots of nitrogen, phosphorus and potassium (K), and very little else; and the higher the crop yield, and the deader the soil, the less and less of all those other nutrients that we need will be available to be taken up by the crop. And if it lacks them, we aren't going to get them by eating it, obviously.
The solution is to adopt or return to regenerative or traditional farming methods. Lower but better yields. And before anyone starts crying 'how then do we feed everyone on the planet?', I would ask them to have a look at the amount of food grown but lost or wasted on the dominant current model of agriculture, and the number of people starving on the dominant current model of agriculture. This FAO page is a good place to start
https://www.fao.org/platform-food-loss-waste/flw-data/en/
I make my own from the chicken shit and ordinary composted waste and weeds from the plots. Yes it's true one gets more weeds in the growing season but weeds have nutrients too and either digging them in or pulling them out as they appear is too much like hard work for many.
I get the hghest yield per square metre of anyone at the field, partly because I grow what the ground and weather is most likely to support, but mostly due to replenishing the nutrients in the soil with my chicken shit compost. I've added a good two inches of decent soil to my plot this last year; the ground has a layer of rubble underneath a very thin soil layer and while I've dug out a good six inches of the rubble there is still not enough good soil depth to grow say parsnips or carrots, or even leeks.