agronomy
Academic field covering crop production and soil management. Used in university course names and research contexts.
He is majoring in agronomy at university.
農学 is a broader term for agricultural science, while 作物栽培学 specifically focuses on crop cultivation and agronomy.
Compound of 作物 (crop) + 栽培 (cultivation) + 学 (study). A straightforward modern academic term.