I am doing it on a small and unscientific scale. My soil is silty sand with a pretty neutral PH. I need to add quite a bit of organic material to get plants t

I am doing it on a small and unscientific scale. My soil is silty sand with a pretty neutral PH. I need to add quite a bit of organic material to get plants to thrive. In the past, I'd turn everything over with a shovel each year. This year I went to a no-till method for my annual crops putting down cardboard and woodchips as mulch. If a plant gives me an indication of a deficiency, I will address it. For example, sometimes my tomatoes need a little extra magnesium.