Here's where a management that aims for diversity of plants comes in handy. If care is taken to plant the correct proportion of nitrogen-fixing plants, and othe

Here's where a management that aims for diversity of plants comes in handy. If care is taken to plant the correct proportion of nitrogen-fixing plants, and other plants (such as comfrey) that will grow really deep roots to extract trace minerals, the nutrient density can be increased. There are techniques to increase the soil fertility with the correct selection of plants. There is a design science, permaculture, that takes all these factors into account.