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Standard operating procedure for soil moisture content by gravimetric method








FAO. 2023. Standard operating procedure for soil moisture content by gravimetric method. Rome.


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    Standard operating procedure for soil total nitrogen - Dumas dry combustion method 2021
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    This Standard Operating Procedure (SOP) describes, in general terms, the quantification of TN content in soil samples by an elemental analyzer. The procedure measures both organic nitrogen and inorganic nitrogen together. A typical limit of detection is 0,1 g kg-1 N, and a typical limit of quantification is 0,3 g kg-1 N, however this varies depending on the manufacturer and detector settings.
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    Standard operating procedure for soil available phosphorus - Olsen method 2021
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    This procedure is suitable for calcareous, alkaline, neutral, and slightly acidic soils containing CaPO4, since the calcium concentration in the solution is suppressed by the precipitation of CaCO3, increasing PO4 concentration in solution. Neutral and slightly acid soils (pH 6.0 to 7.0) may contain both Ca- and Al-phosphates. The NaHCO3 extractant can remove Ca-phosphates and phosphate adsorbed on the surface of calcium and magnesium carbonates along with Al-phosphates and is considered the most suitable extractant for these soils.
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    Standard operating procedure for cation exchange capacity and exchangeable bases by 1N ammonium acetate, pH 7.0 method 2022
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    This procedure outlines the process for the determination of cation exchange capacity (CEC) and exchangeable bases (calcium, magnesium, potassium and sodium) in soil using 1N ammonium acetate at pH 7. The method gives an estimation of plant-available exchangeable bases.

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