The term "most agronomic" refers to something that is related to agriculture or farming practices that are efficient, sustainable, and effective. However, some antonyms for this word would be non-agronomic, unsuitable, inefficient, unsustainable, impractical, and ineffective. These words indicate a lack of suitability or compatibility with agriculture or farming practices, making them ineffective in terms of productivity and sustainability. Non-agronomic or unsuitable practices can lead to soil degradation, decreased crop yield, and environmental degradation. Therefore, it is important to choose agronomic practices that are sustainable, efficient, and effective to ensure long-term productivity, profitability, and environmental benefits.