noun. The study of plant nutrition and growth in relation to soil conditions, especially to determine ways to increase crop yields.

noun. The science of plant life and nutrition.

noun. the study of plant nutrition and growth especially as a way to increase crop yield

"Lysenko's main problem was to maintain his reputa - tion as a master of “agrobiology” (the term was his invention)."

agrobiologically  

agrobiologic  agrobiological  agrobiologist  

science  scientific discipline