Results: Retention and release of Potassium after addition of 1000 ppm K
Cumulative
K
retention/
release
(mg kg-1)
RETENTION: The six soil series retained between 334 mg K kg-1
in Vijaypura to 713 mg K kg-1 in Kumbhave
RELEASE: Cumulative potassium release varied between 183 mg K kg-1
in Vijaypura to 766 mg K kg-1 in Kumbhave
K release was strongly correlated (r = 0.92**)
with the amounts of K retained by the soils
The highest retention and release was observed in Kumbhave, containing the
highest amount of silt and clay and the highest content of kaolinite
The release of K exceeded the amount of fixed K in Kumbhave and considerable
amount of native K (53 mg kg-1) was released in excess of fixed
K. This suggests that kaolinitic soils with high clay and silt content may
cause faster depletion of native K, requiring more external application to
maintain proper K balance
