How many letters does the top answer for “of or relating to or promoting agronomy” have?

The most common answer is agronomic (9 letters).

Crossword clue: of or relating to or promoting agronomy

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

agronomic 9 letters wn-def

of or relating to or promoting agronomy

agronomical 11 letters wn-def

of or relating to or promoting agronomy

relating to or promoting digestion 50% similar → peptic