The water soluble paste extract test shows potential nutrient mobility of what is on the soil colloid, as seen on the standard soil test. This is a soil test using a weak extraction solution (de-ionized water) instead of the stronger acid (Melhic III) used with the standard soil test. This data is very valuable when building liquid and foliar feeding programs. It identifies bicarbonate loads, parts per million of the basic cations and anions, the important percentage between potassium and sodium and finally how soluble trace elements may or may not be.