Here is the cycle laid out in four clean links: action leads to yajna, yajna brings rain, rain produces food, and food sustains all living beings. It reads almost like an ecological chain. One feeds into the next, round and round without end.
This is not merely agricultural science dressed in spiritual language. It is a philosophical vision. When human beings perform right action, the balance of nature is maintained. When they do not, the chain breaks. Individual action is never isolated. Its consequences ripple through the entire web of life.