Soils having 200 kg available K2O/ha will be classed as

Answer: Option B

Soils having 200 kg available K₂O per hectare will be categorized as medium. The dense clay soil has usually a high concentration of potassium, as it traps the mineral and allows it to build to highly concentrated levels.
The quality or grade of potassium fertilizers is expressed as a percentage of potassium oxide (K₂O) equivalent. The most common potassium fertilizers used in agriculture are Muriate of Potash.