Abstract
Potassium Fixing Capacities of Some Selected Soils in South Western Nigeria
Highlights
Potassium (K) is the third most essential nutrient element after nitrogen and phosphorus for plant nutrition
Non-exchangeable or fixed K represents the portion held between adjacent tetrahedral layers of 2:1 clay minerals such as micas and vermiculites and which is sparingly available to plants [6,3,4] while mineral or structural K consist about 90-98% of total soil potassium and constitutes the portion that is bonded within crystal structures of soil mineral particles [7]
Potassium and sodium levels were below the critical limit in most of the soils investigated, other nutrients (N, P, Organic Carbon, Ca, Mg) were above the critical range, suggesting little or no response to fertilizer application for those nutrients
Summary
Potassium (K) is the third most essential nutrient element after nitrogen and phosphorus for plant nutrition. It is very instrumental in plant nutrition and physiology. Potassium exists in four forms in the soil These include the solution, exchangeable, non-exchangeable or fixed and mineral or structural K forms [3,4,5]. Non-exchangeable or fixed K represents the portion held between adjacent tetrahedral layers of 2:1 clay minerals such as micas and vermiculites and which is sparingly available to plants [6,3,4] while mineral or structural K consist about 90-98% of total soil potassium and constitutes the portion that is bonded within crystal structures of soil mineral particles [7]
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