Nutritional levels and use of organic minerals: Prof. Rostagno

In field the organic or inorganic mineral impact is very low. Many years we have been using the trace minerals in normal dose, but never found any deficiency. In recent times, one particular farmer didn't use any TM without any drop in performance for 2 months. So can we forego TM in order to see that the soil content doesn't change by voiding of minerals by excretion?