Answer: You are weeding your garden when you accidentally expose some roots of your pea plants. You notice swellings (root nodules) on the roots, and there is a reddish tinge to the ones you accidentally damaged. Most likely your pea plants will die.
Explanation:
The nodules serve to capture nitrogen. In them there are some bacteria that live there and they are the ones that capture the nitrogen for them and for the plant. And this is called symbiosis. The plant needs bacteria to give it nitrogen. And bacteria need the plant because it gives them all the nutrients they need (except nitrogen).
The good thing about peas is that they harvest and it is also a free and natural super fertilizer. If the plants are buried in the pots, they decompose very quickly and the following year the soil is full of nitrogen.