A dataset of soil potassium content and aggregate-associated potassium fraction in long-term biochar amended field

Our data was obtained from a field where biochar was applied for 9 years with different methods. The data contains three parts: 1) soil potassium content, including water-soluble potassium (WSK), exchangeable potassium (EK), non-exchangeable potassium (NEK), and total potassium (TK), 2) Soil Aggregate distribution and aggregate-associated EK, NEK, and TK pools; 3) Maize dry weight and potassium uptake. In the Excel file, different letters indicate significant differences among treatments at 0.05 level.