These soil K forms vary significantly in their availability to plants, with both soln K and exch.
By comparison, there was a weaker relationship for exch.
Exploration of the relationships between soil K variables indicated a log-log relationship between exch.
For comparison, the observations from this study (for exch.
A significant negative linear relationship between plant K uptake and final exch.
The plotting of nutrient efficiency indices (UPE and UTE) with final exch.
Overall, the mean proportions of total soil Co present in the different fractions decreased in the order: RES [is greater than] FeCR [approximately equals] FeAM [is greater than] ORG [is greater than] MnOX [much greater than] EXCH.
Mean proportions of Mn decreased in the order: RES [approximately equals] FeAM [is greater than] MnOX [is greater than] FeCR [is greater than] ORG [approximately equals] EXCH.