Determination of extractable phosphorus by bray and kurtis
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Phosphorus is extracted from the soil using Bray No 1 solution as extractant. ... The absorbance of the compound is measured at 882 nm in a spectrophotometer and is directly proportional to the amount of phosphorus extracted from the soil.
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The soil phosphorus measured is that which is extracted by a solution consisting of 0.025 normal HCl and 0.03 normal NH4F, referred to as Bray-1 extractant. ... The color is measured by a Brinkman PC 900 probe colorimeter at 880 nm. The result is reported in parts per million (ppm) phosphorus (P) in the soil.
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