Can anybody please suggest which method would be best to determine ortho-phosphate in soil?

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Tyler Hurst

This method might be useful to you, depending on your instrument set up.

https://www.epa.gov/sites/production/files/2015-08/documents/method_365-1_1993.pdf

Jukka Salminen

Phosphate in soil can be bound to different cations and extracting methods have to be adjusted accordingly https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_051918.pdf

Muhammad Abdul Munnaf

I would say, it depends on your requirements. You can take the follwings as the guidlines

https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_051918.pdf

Farida Yasmin Ruma

Thanks a lot for your valueable answer Tyler Hurst