Final answer:
The Haber process and Rhizobium bacteria both fix atmospheric nitrogen into ammonia, though one is a chemical process, and the other is biological, both contributing to soil fertility and assisting plant growth.
Step-by-step explanation:
Both the Haber process and Rhizobium bacteria have the capability to fix atmospheric nitrogen into a form that is usable by plants. The Haber process is a chemical method for fixing nitrogen using high temperature and pressure to react nitrogen gas with hydrogen, whereas Rhizobium bacteria participate in a biological nitrogen fixation process within nodules on the roots of leguminous plants.
This symbiotic relationship allows the fixed nitrogen in ammonia form to be used directly by the host plant, and also enhances the fertility of the soil due to nitrogenous compounds left behind by the plant roots. In both cases, atmospheric nitrogen is converted into ammonia, which is then available for plant use, thus making them important contributors to soil fertility and agricultural productivity.