The potassium contents of various soils in Kiangsu differ greatly. Analysis of more than seven hundred representative soil samples selected from different parts of the Province showed that the contents of available K (1N NH₄,OAc extractable) in soils ranged 4.8-32.0 mg K₂O/100 g soil,slowly available K (soluble in boiling 1N HNO₃) 20.9-145.1 mg K₂O/100 g soil,and the total,K₂O 1.41-2.67% (for detailed informations refer to table 1 in the Chinese text).It was found that the parent materials and their degree of weathering,and soil texture have coused such differences.