Waterwheels benefit the farming process in several ways:

1. **Irrigation**: They provide a sustainable means of directing water to fields, enhancing crop growth.
2. **Mechanical Power**: Waterwheels can power machinery used for milling grain or processing crops, reducing manual labor.
3. **Soil Health**: Regular watering schedules facilitated by waterwheels can help maintain soil moisture, leading to better crop yields.

As for the incomplete sentence, it could relate to various factors impacting agricultural productivity, such as "technologies," "practices," or "resources."