In an article(book maybe) about George Washington Carver [0], they mentioned how how recommended planting cowpeas as they are able to extract nitrogen from the

In an article(book maybe) about George Washington Carver [0], they mentioned how how recommended planting cowpeas as they are able to extract nitrogen from the air and put it back into the soil. This helped increase cotton yields when the cotton was planted in the same field after the cowpeas had been harvested. As a side note, the Haber Process [1] was the industrial version of this and all of the preceding points, if not phytomining per se, feel very similar. 0 - https://en.wikipedia.org/wiki/George_Washington_Carver https://en.wikipedia.org/wiki/George_Washington_Carver 1 - https://en.wikipedia.org/wiki/Haber_process https://en.wikipedia.org/wiki/Haber_process