Agronomy is the science of the use of plant life, for such purposes as food, fuel, and fiber, among others. Agronomy encompasses a number of scientific fields, including plant genetics and physiology, biochemistry, ecology, earth science, etc.
Agronomy played a key role in 21st century Earth culture, spurred in part by Humanity's settlement of the Sol system and the need to make those off-Earth colonies self-sufficient. Agronomy also brought about the widespread farming of Earth's oceans, with kelp becoming a crop that could be synthesized into a variety of edible forms, enabling the starving regions of the world to be fed.
Tatya Bilash and Yoshi Nakamura were agronomists who ran the Agro III agrostation in the South Pacific Ocean. (TOS novel: Strangers from the Sky)