Phosphate-Olsen (neutral-/alkaline soil)


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This is a soil fertility test. This procedure estimates the availability of phosphate in soils with neutral to alkaline pH.  It is based on the extraction of phosphate from the soil by 0.5 N sodium bicarbonate solution adjusted to pH 8.5.  The method has shown to be well correlated to crop response to phosphorus fertilization on neutral to alkaline soils.  The method has a detection limit of 1.0 ppm.