Potassium (K) is positively charged cation, possessing a single positive charge per ion. Potassium is not held well on soil colloids; which will be populated by calcium and magnesium in well limed soils; although our parent rock material in our soils in SE New England often contains high amounts of potassium, the annual "recharge" rate is often not enough to maintain optimum potassium levels in our soils for maximizing yields. Therefore it is a common practice to add potassium fertilizers for...
