A suite of soil tests is commonly used to measure putatively 'available' nutrients; however, the tests need to be calibrated for soil/crop combinations to provide accurate predictions of nutrient supply and/or fertiliser requirement. Calibration requires field trials, preferably in conjunction with plant tissue analysis to assess sufficiency of nutrient supply.
Dear Dr. You can estimate macro and micronutrients in soil sample and compare this determine concentrations for most elements with standard concentrations from it and then yoy calculate nutrients supply for different plants and it physiological age or growth stage.