Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Shoot potassium'?

A. Ratio of shoot biomass produced per unit of water lost from the field through both transpiration and evaporation
B. Ratio of shoot biomass produced per unit of transpired water
C. Standard residual after removing the effects of flowering time and yield potential advantages from the drought yields
D. the concept content from plants/subset of plants.

Answer: the concept content from plants/subset of plants.