Description
Olsen-P.
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.