ag·ro·chem·i·cal 
(ăg′rə-kĕmĭ-kəl) also ag·ri·chem·i·cal (ăg′rĭ-)
(ăg′rə-kĕmĭ-kəl) also ag·ri·chem·i·cal (ăg′rĭ-)n.
A chemical, such as a fertilizer, hormone, fungicide, insecticide, or soil treatment, that improves the production of crops.