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When extracting available phosphorus from soil, the extract is usually light brown or light red. What decolorization should be added at this time?
When extracting available phosphorus from soil, the extract is usually light brown or light red. At this time, sodium bicarbonate needs to be added to decolorize.

The determination of available phosphorus in soil is of direct guiding significance for fertilization. There are many methods to determine available phosphorus in soil, and the results are different because of different extractants. Generally, calcareous soil and neutral soil are extracted with sodium bicarbonate, and acidic soil is extracted with acidic ammonium fluoride.

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