Dears I am looking for values of maximum allowable limits for sodium, potassium, and calcium in soil?

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Jos P M Wielders

What is the use of these maximum limits. They are naturally occuring elements needed for plant growth etc.

Chapter The Composition of Soils and Sediments

Azad H. Alshatteri

Dear Jos

when we analyse a soil sample for Na and K and Ca, what are normal range of them. I know they are essential but if we have too much or too small level does it make matter or not?

The normal ranges highly depend on the kind of soil, e.g. sandy or clay, the organic content etcetera.

You will find examples in the literature, just google Soil Mineral Content.