Right, faba bean was cut for 'green manure' just after the flowering stage. The remaining plants cover the soil, add nitrogen and other nutrients, and improve soil conditions. The plants on the left were allowed to grow to the dry bean stage, then harvested. |
Nitrogen fixation is one of the best examples
of cooperation in nature. Soil microbes naturally occurring bacteria
in the soil work with plants to pull nitrogen from the air. They
turn the nitrogen into a form the plant is able to use. In return, the
plant lets the microbes eat some of the sugars it makes.