Standard operating procedure for boron determination in soil: Hot water extraction
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The hot water-soluble B procedure is the most commonly used method for predicting the concentration of B that will be available to plants in a soil solution. Hot water-soluble B is commonlyused because the water-soluble B extracted by the hot water method correlates positively to plant growth response, as it measures B from the adsorbed, organic, and soluble pools of the soil at boiling temperatures. The aim of this SOP is to guide users on the determination of hot water-soluble B in soils through the application of three routine procedures, using azomethine-H, AAS, ICP-AES, and the Berger and Truog extraction method.