How do you ensure the trace elements are present and available? I assume there's some testing you can do for both the soil and the produce, but how do you fix any deficiencies that you discover?
I keep the pH within ranges that plants can uptake nutrients and apply both mineral and trace mineral supplements in sufficient quantities. Azomite for instance which I apply to working compost and calcium magnesium supplements. Additionally I apply other supplements like organic acids (fulvic and humic acid) which aid in the transport.
I also remove all minerals from irrigation water with RO and use an engineered growing medium rather than growing in native soil. But it's organic (and alive with microbes), not hydroponic or anything like that.
