It grows without water, you get foods that are very nutritious and can be stored for a long time, and your soil gets rich day by day without doing anything.
The plant you see in the photos is peanut. The white buds seen in the roots are nitrogen-fixing bacteria. These bacteria bind the free nitrogen in the air to the soil and enrich the soil day by day.
Just because peanuts or any other nitrogen-fixing plants are cultivated does not mean that nitrogen will be attached to the soil. First of all, there must be a suitable environment in which these nitrogen-fixing bacteria can live.
In order to improve the soil, it is first necessary to heal the soil. The way to heal the soil is as follows;
Mix seeds, make a seed ball and scatter. Nature will do the rest itself.